Pennsylvania Asbestos Exposure Job Sites
Pennsylvania Job Sites, Asbestos Exposure and Mesothelioma Lawsuits
In Pennsylvania, numerous job sites have been linked to asbestos exposure, putting workers at risk of developing mesothelioma and other asbestos-related diseases. Companies such as U.S. Steel in Pittsburgh, Bethlehem Steel in Bethlehem, and the Philadelphia Naval Shipyard have historically used asbestos in their operations, leading to exposure among workers.
Workers in industries such as steel manufacturing, shipbuilding, power generation, and construction were particularly vulnerable to asbestos exposure due to the widespread use of asbestos-containing materials in these sectors. Asbestos was commonly used for insulation, fireproofing, and other purposes in buildings, machinery, and equipment.
Unfortunately, many workers in Pennsylvania were unknowingly exposed to asbestos fibers, which can become airborne during activities such as cutting, sanding, or demolishing asbestos-containing materials. Inhalation or ingestion of these microscopic fibers can lead to serious health issues, including mesothelioma, lung cancer, and asbestosis.
As a result, many individuals in Pennsylvania have pursued mesothelioma lawsuits to seek compensation for their medical expenses, lost wages, and pain and suffering caused by asbestos exposure. Mesothelioma lawyers in Pennsylvania specialize in representing victims of asbestos exposure and advocating for their rights in legal proceedings. Raising awareness of the risks associated with asbestos exposure and ensuring access to legal recourse are essential for protecting the health and well-being of Pennsylvania workers.
History of Asbestos Exposure on Pennsylvania Job Sites
Pennsylvania has a significant history of asbestos exposure on its job sites, spanning various industries like shipbuilding, construction, manufacturing, and mining. Asbestos was widely used in these sectors due to its fire-resistant and insulating properties. Beginning in the early 20th century and continuing through much of the century, asbestos-containing materials were prevalent in buildings, machinery, equipment, and infrastructure across Pennsylvania.
Shipyards along the Delaware River, including those in Philadelphia and Pittsburgh, heavily relied on asbestos in ship construction and repair. Similarly, construction projects throughout the state, including the building of bridges, roads, and commercial buildings, utilized asbestos-containing materials. Additionally, the mining industry in regions like the Allegheny Mountains exposed workers to asbestos fibers, as asbestos was commonly found in minerals such as vermiculite.
Unfortunately, many workers in Pennsylvania were unaware of the dangers of asbestos exposure during this time. It wasn’t until later years that the harmful effects of asbestos became widely recognized, leading to increased regulations and safety measures. However, the legacy of asbestos exposure persists in Pennsylvania, with many individuals developing asbestos-related diseases such as mesothelioma, lung cancer, and asbestosis as a result of past exposure on job sites throughout the state. Efforts to raise awareness and implement stricter safety standards remain crucial for preventing future cases of asbestos-related diseases in Pennsylvania.
Asbestos Cover up – Quotes from Asbestos Executives
Evidence in thousands of court documents have shown that asbestos companies hid and destroyed memos, documents and ignored doctor’s medical reports about the dangers of asbestos exposure. Despite all the information about the deadly dangers of asbestos exposure available in the scientific and medical literature asbestos companies chose not to take any action to protect workers.
They chose profit over the safety of their workers and then lied and covered it up. This is why U. S. Courts are making asbestos manufacturers and companies pay millions to asbestos victims for their asbestos cover up.
- “…if you have enjoyed a good life while working with asbestos products, why not die from it.”1966 memo from an executive of the Bendix Corporation (now part of Honeywell)
- In early 1940s, the president of Johns-Manville called the managers of another company “a bunch of fools for notifying employees who had asbestosis.” When asked by another company executive, “Do you mean to tell me you would let them work until they drop dead?” he responded, “Yes. We save a lot of money that way.”
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Pennsylvania Mesothelioma Asbestos Exposure Information
For more comprehensive information about asbestos exposure in Pennsylvania, you can explore the following links:
Pennsylvania Asbestos Exposure Job Sites: Discover locations with heightened asbestos exposure risks within Pennsylvania.
Pennsylvania Workers Mesothelioma Lawyer: Get insights into mesothelioma lawsuits filed by Pennsylvania workers and the legal support available.
Pennsylvania Veterans Mesothelioma Lawyer: Connect with experienced lawyers who specialize in mesothelioma cases, particularly for veterans seeking legal assistance in Pennsylvania.
Pennsylvania Counties and Cities with Asbestos Exposure: Explore locations in Pennsylvania where asbestos exposure is a concern. Learn about associated risks in various counties and cities, including specific industries that pose potential hazards.
Pennsylvania Asbestos Exposure Job Sites A-Z
| A & A Co. – Philadelphia | Lincoln Coal & Coke Co. Waterburg |
| A & P Stores – Beaver Falls | Lincoln High School – Ellwood City |
| A & P Stores – Indiana | Lincoln Liberty Building – Philadelphia |
| A & P Stores – McKees Rocks | Lindberg Newtown Square |
| A & S. Wilson Co. – Pittsburgh | Linde Air Kittanning |
| A French Spring Co. – Pittsburgh | Linde Air Products Co. Coatesville |
| A Garrison Foundry Co. – Pittsburgh | Linde Air Products Co. Duquesne |
| A Hill Co. – Erie | Linde Air Products Co. Kittanning |
| A J Cameron Co. – Philadelphia | Linde Air Products Co. Pittsburgh |
| A J Haws & Sons Ltd – Johnstown | Linde Co. – Erie |
| A M Byers & Co. – Pittsburgh | Lindner Shoe Co. – Carlisle |
| A Moe & Co. – Philadelphia | Lindner Shoe Co. Philadelphia |
| A P Green Tarentum | Line Co. – Braddock |
| A S G Industries Jeanette | Link Belt Co. – Colmar |
| A T & T – Allentown | Link Belt Engineering Co. – Nicetown |
| A T & T Co. – Reading | Liquid Bulk Terminal |
| A T & T Wayne | Liquid Carbonic Acid Manufacturing Co. – Pittsburgh |
| A. & P. Roberts Co. – Pencoyd | Liquid Carbonic Corp – Philadelphia |
| A. & S. Wilson Co. – Pittsburgh | Liquid Carbonic Corp. – Philadelphia |
| A. B. Chance – Parkersburg, WV | Littell Steel – New Brighton |
| A. B. E. Airport – Allentown | Little Rock – Philadelphia |
| A. Barletta & Sons – Hazleton | Little Sisters of the Poor |
| A. Berg Co. Philadelphia | Little Sisters of The Poor – Pittsburgh |
| A. Blumberg & Sons – Philadelphia | Lochers Green House View |
| A. C. & S. – Lancaster | Lochiel Rolling Mill Co. – Harrisburg |
| A. C. & S. Inc. – Philadelphia | Lock Dam – Allegheny River |
| A. C. Overholt & Co. – Broad Ford | Lock Haven Hospital – Lock Haven |
| A. C. Overholt & Co. Broad Ford | Lock Haven Research Learning Center – Lock Haven |
| A. Clemente, Inc. Penns Grove, NJ | Lockhart Iron & Steel – Pittsburgh lockhart Iron & Steel |
| A. Darrah Contractors – Philadelphia | Lockhart Iron & Steel Co. – McKees Rocks |
| A. Deruy – S. Bethlehem | Locomotive Works Eddystone |
| A. E. Staley Manufacturing Co. – Corn Plant – Morrisville | Locust Spring Colliery – Locust Gap |
| A. French Spring Co. – Pittsburgh | Loewengart Co. Inc. Tannery Div. Mercersburg |
| A. G. Monday Plastic Plant – Pasadena, TX | Loftus Engineering Co. Pittsburgh |
| A. G. Vento Plumbing Co. – Greensburg | Logan Iron & Steel Co. – Burnham |
| A. G. Vento Plumbing Co. – Greenville | Logan Iron & Steel Co. Lewistown |
| A. Garrison Foundry Co. – Pittsburgh | Logan Valley Mall – Altoona |
| A. Guckenheimer & Brothers – Freeport | Lone Star Cement Corp. Nazareth |
| A. H. Wirz, Inc. – Chester | Lone Star Industries Inc. Nazareth |
| A. Hirsch Air Co. – Philadelphia | Long Mead Iron Co. Conshohocken |
| A. I. W. Frank Corp. – Exton | Long Publishing Co. – Philadelphia |
| A. I. W. Frank Corp. Exton | Longmead Iron Co. – Connellsville |
| A. J. Cameron Co. – Philadelphia | Long’s P & H Service – Easton |
| A. J. Cameron Co. Philadelphia | Longs P H Service Easton |
| A. J. Haws & Sons Limited – Johnstown | Longshoremans Union – Local 1291 – Philadelphia |
| A. J. Haws Sons Limited Johnstown | Longstreth Elementary School Philadelphia |
| A. K. Garrett Co. – Philadelphia | Loos & Dilworth – Philadelphia |
| A. K. Garrett Co. Philadelphia | Loose Wiles Biscuit Co. – Pittsburgh |
| A. M. Byers Co. – Ambridge | Lorain Steel Co. – Johnstown |
| A. M. Byers Co. Inc. – Pittsburgh | Lords Bonded Rubber Co. – Erie |
| A. M. Byers Co. Inc. Pittsburgh | Loren’s Heat Treating – Philadelphia |
| A. M. Byers Steel Mill – Ambridge | Lorenz & Sons – Philadelphia |
| A. Moe & Co. – Philadelphia | Lorenz Heat Treating – Philadelphia |
| A. Overholt Co. Broad Ford | Lorenz Sons Philadelphia |
| A. P. Green – Philadelphia | Lormack Corp. – Schellburg |
| A. P. Green – Tarentum | Los Angeles Philadelphia |
| A. P. Green Fire Brick Co. – Philadelphia | Loskos Body Shop – Daisytown |
| A. P. Green Plant – Philadelphia | Lou Miles, Contractor Sharon |
| A. P. Green Refractory Co. – Philadelphia | Louis B. Orlowitz Plumbing Supply – Philadelphia |
| A. P. Roberts Co. Pencoyd | Louis Kraemer & Co. – Reading |
| A. Pardee & Co. – Hazleton | Lovekin Trageser Div – Philadelphia |
| A. S. Siter & Sons – Morton | Lovekin Water Heater Co. Home Office Philadelphia |
| A. S. Wilson Co. Allegheny | Lovell Coal Mining Co. – Portage |
| A. S. Wilson Co. Pittsburgh | Lovell Manufacturing Co. – Erie |
| A. T. & T. Solid State Technology Center – PA | Lower Burrell High School – Lower Burrell |
| A. T. T. Solid State Technology Center Leigh County | Lower Burrell Junior High School – Lower Burrell |
| A. T. T. Technologies Allentown | Lower Merion High School – Ardmore |
| A. V. E. Airport – Allentown | Lower Mount Bethel |
| A. W. Cadman Manufacturing – Pittsburgh | Lower Works – Woodland |
| A. W. Cadman Manufacturing Pittsburgh | Loyalhanna School – Latrobe |
| A. Wilhelm Co. – Reading | Lsonnebarn Sons Inc. Petrolia |
| A. Y. Michie – Philadelphia | LTV Sheet & Tube Midland |
| A.P. Green Plant – PA | Ltv Specialty Steel Products Plant – Midland |
| A.T. & T. Technologies – Allentown | LTV Stee South Side Plant Pittsburgh |
| AAA Penn Circle | LTV Steel Aliquippa |
| AAA Washington | LTV Steel Ambridge |
| Abarb Corp. – Festerville | LTV Steel Baden |
| Abbots Dairies Inc. – Bellefonte | LTV Steel Beaver Falls |
| Abbotts Dairies Inc. Belleville | LTV Steel Coke Plant Pittsburgh |
| Abbotts Dairy – Curryville | LTV Steel Hazelwood Plant Pittsburgh |
| Abex Corp. Meadville | LTV Steel Monaca |
| Abington – Natrona Heights | LTV Steel Pittsburgh |
| Abington High School – Abington,PA | LTV Steel Rochester |
| Abington Hospital – Abington,PA | LTV Steel Southside Pittsburgh |
| Abington School District – Abington | Lucent Technologies Allentown |
| Abrams Storage Yard Bridgeport | Lucent Technologies Breinigsville |
| Abroqast Bastin Co. – Allentown | Lucent Technologies Reading |
| AC & S, Inc. Lancaster | Lucerne Mines – Indiana |
| Academy of Music Broad Street Philadelphia | Lucifer Furnaces Warrington |
| Academy Of The New Church – Bryn Athyn | Lucy Furnaces Co. Pittsburgh |
| Acands, Inc. – Pittsburgh | Ludlow Elementary School – Philadelphia |
| Acco- Building Insulation – Lancaster | Luke Fidler Colliery – Shamokin |
| Ace Motor Co. – Philadelphia | Lukens Iron & Steel Co. – Coatesville |
| ACF Industries Berwick | Lukens Steel Co. Coatesville |
| Achenbach & Butler, Inc. – Philadelphia | LuMax Industries Altoona |
| Acheson Brass Foundry – Rankin | Lumber Yard – Townville |
| Achibald Colly – Archibald | Lupton Manufacturing Co. – Philadelphia |
| Acme Dept. Store – Altoona | Luzerne County Gas & Electric – Hunlock Creek |
| Acme Hardesty Industries – Philadelphia | Luzerne County Gas & Electric Co. – Luzerne County |
| Acme Heat Treat, Inc – Philadelphia | Luzerne County Gas & Electric Humlock Creek |
| Acme Heat Treat, Inc. – Philadelphia | Luzerne Coutny Gas & Electric Co. – Plymouth |
| Acme Iron & Metal Co. – Philadelphia | Lycoming Edison Co. – Wiliamsport |
| Acme Markets – Overbrook | Lycoming Rubber Co. Williamsport |
| Acme Markets – Philadelphia | Lykens Valley Coal Co. Lykens Valley |
| Acme Markets Warehouse – Reading | Lynn Heidelberg School – New Tripoli |
| Acme Philadelphia | Lynn Heidelberg School Tripoli |
| Acme Tea Co. – Philadelphia | Lynnewood Gardens – Elkins Park |
| Acme Warehouse – Philadelphia | Lytle Coal Co. – Minersville |
| Acoustical Lab – PA | Lytle Coal Co. Primrose |
| Acousticraft, Inc. – Connellsville | M & G Industrial – Pittsburgh |
| Ada Lewis Junior High School – Philadelphia | M & O Dredging McKees Rocks |
| Adams Apple Products – Bendersville | M & W H Nixon Paper Co. – Philadelphia |
| Adams Mine – Irwin | M Miller Spring & Manufacturing Co. – Pittsburgh |
| Adelta Manufacturing – Philadelphia | M S A Research Corp – Gallery |
| Adley Express Co. – Philadelphia | M Schnoll & Sons – Philadelphia |
| Administrative Building – Papago Park | M. & M. Mars, Inc. Elizabethtown |
| Adrian Furnace – Dubois | M. & W. H. Nixon Paper Co. Philadelphia |
| Advanced Specialty Co. – Lansdale | M. H. Detrick – Fairless Hills |
| AEC Uranium Plant – Paducah, KY | M. H. Detrick |
| Aero Supply Manufacturing – Corry | M. H. Pickering – Pittsburgh |
| Aetna Chemical Co. – Carnegie | M. H. Pickering Pittsburgh |
| Aetna Chemical Co. – Oakdale | M. L. Bayard & Co. – Philadelphia |
| Aetna Explosives Co. – Emporium | M. L. Clothier Villa Nova |
| Aetna Explosives Co. – Mt. Union | M. S. A. Research Center – Callery |
| Aetna Standard – Ellwood City | M. Schnoll & Sons – Philadelphia |
| Aetna Steel Product Corp. – Allentown | M. T. Seakite – Chester |
| Aggregates Equipment Co. – Leola | M. W. Kellogg Co. Williamsport |
| Aiken Medical Building – Pittsburgh | Mabel Furnace – Sharpsville |
| Air Master – Philadelphia | Mac- Co. Service Pittsburgh |
| Air Production Sales – Johnstown | Mac Service, Inc. – Wilson |
| Air Products & Chemicals – Allentown | Mac Service, Inc. Windber |
| Air Products Co. – Hometown | Macaw Brothers Norwood Station |
| Air Products Co. Chemicals Allentown | Mach & Boiler Works |
| Air Products Co. Emmaus | Mach Trucks, Inc. – Allentown |
| Air Products Co. Glassmeyer | Machine Shop Altoona |
| Air Products Co. Hometown | Machold & Riddell – Philadelphia |
| Air Products Co. Pittsburgh | Mack Axe Works – Beaver Falls |
| Air Reduction Co. – Johnstown | Mack Manufacturing Corp. – Allentown |
| Air Reduction Plant – Bethlehem | Mack Truck – Allentown |
| Air Reduction Sales Co. Bethlehem | Mack Truck Mackungie |
| Air Reduction Sales Co. Butler | Mack Warehouse – Philadelphia |
| Air Reduction Sales Co. Enola | Mackintosh Hemphill – Midland |
| Airco – Butler | Mackintosh Hemphill & Co. Pittsburgh |
| Airco – Monaca | Mackintosh-Hemphill Co. – Pittsburgh |
| Airco Speer Carbon Products – Saint Marys | MacMurray High School – MacMurray |
| Airforce Base – Pittsburgh | MacMurray Middle School – MacMurray |
| Airmaster Inc – Philadelphia | Maddock & Co. – Bala Cynwyd |
| Airport Honda – Moon Township | Madonna Grade School – New Castle |
| Ajax Ironworks – Corry | Magazine Lumber Co. – Carbondale |
| Ajax Metals Co. – Philadelphia | Magazine Lumber Co. Cardale |
| Ajax Rocking Furnance – Leetsdale | Magee Carpet Co. Building 50 Bloomsburg |
| Ak Steel – Butler | Magee Carpet Co. Pipe Shop Bloomsburg |
| Alamogordo Lumber Co. – Scranton | Magee Women’s Hospital – Pittsburgh |
| Alan Wood Iron & Steel Co. – Connellsville | Maginn & Lewis – Pittsburgh |
| Alan Wood Iron Steel Co. Steel Department Conshohocken | Magnetic Springs Railway Co. |
| Alan Wood Iron Steel Co. Swedeland | Mahandy Area Middle School – Mahandy City |
| Alan Wood Steel Co. – Ivy Rock | Mahanoy Area Education Complex – Mahanoy City |
| Alan Wood Steel Co. – Philadelphia | Mahanoy City Water Co. – Girard Point |
| Alan Wood Steel CO. Norristown | Mahanoy Plane |
| Albert Stover – Kintersville | Mahoning Dam – Armstrong |
| Albright Coal Co. – Llewellyn,PA | Mahoning Rolling Mill Co. – Danville |
| Albright Coal Co. Pottsville | Mahoning Valley Iron Co. – Pittsburgh |
| Albright College – Reading | Mahoningtown Shops – New Castle |
| Alcania Tin Plate Co. – Avonmore | Main Street Office Complex – Johnstown |
| Alco Drywall Turtle Creek | Mains Service – Sutterville |
| Alcoa – Cressona | Maintenance & Engineering Corp. – Pittsburg |
| Alcoa- Aluminum Co. Of America – Lancaster | Majestic Apartment House – Philadelphia |
| Alcoa Aluminum Rolled Products Plant – Lancaster | Makefield Elementary Yardley |
| Alcoa Building – Pittsburgh | Mall – Washington |
| Alcoa Co. Canonsburg | Mall – Williamsport |
| Alcoa CO. Cressona | Mall Office Building – Philadelphia |
| Alcoa Co. Glassmere | Malsbary Manufacturing Co. Uniontown |
| Alcoa Co. Lebanon | Malthby Colliery – Wyoming |
| Alcoa Co. Leechburg | Mammoth Plant Mammoth Station |
| Alcoa Co. McKees Rocks | Mamoth Plant |
| Alcoa Co. Merwin | Manayunk Philadelphia |
| Alcoa Co. New Castle | Manchester Station – Pittsburgh |
| Alcoa Co. New Kensington | Manganese Steel Forge Co. – Philadelphia |
| Alcoa Co. Pittsburgh | Manhattan Slate Co. – Slatington |
| Alcoa Laboratory – Pittsburgh | Mann Brothers – Harrisburg |
| Alcoa Laboratory New Kensington | Manor Brick Crafters Inc. New Oxford |
| Alcoa Research Laboratories – New Kensington | Mansfield State College – Mansfield |
| Alcoa Research Labs – Pittsburgh | Manufacturing Facility Ambridge |
| Alcoa Technical Center Alcoa Center | Manufacturing Gas Co. – Washington |
| Alcoa Technical Center Merwin | Manufacturing Plant |
| Alcoa, Cressona Work Cressona | Maple Ridge School – Somerset |
| Alcoa-Reynolds Metals – Canonsburg | Maple St. Beaverdale |
| Alcoa-Reynolds Metals- Glassmere | Marathon Corp. Lester |
| Aldan Borough – PA | Marcal Paper Mills, Inc. – Philadelphia |
| Alden Coal Co. Alden | Marck Sharp Dohme Inc. Mulford Plant Philadelphia |
| Aldon Rug Mills – Lenni | Marcus Hook – Lester |
| Alequippa Steel Co. – Pittsburgh | Marcus Hook Plant – Maple Glen |
| Alert Co. – Chester | Marcus Hook Plant Marcus Hook |
| Alex Crow & Son – Philadelphia | Marcus Hook Refinery – Maple Glen |
| Alexander Brothers Philadelphia | Marcus Hook Refinery Chester |
| Alexander Good Elementary School – York | Marcus Hook Refinery Marcus Hook |
| Alexander Plumbing Co. – Pittsburgh | Marcus, Ruth & Jerome Rendering Plant – McKees Rocks |
| Algonquin Chemical Co. – Hamburg | Marienville Glass Plant – Clarion |
| Algonquin Coal Co. – Miners Mills | Marietta Carpet Plant – Marietta |
| Algonquin Coal Co. – Wilkes Barre | Marietta Metal Products Corp. – Marietta |
| Aliquippa & Southern RR – Aliquippa | Marietta Metal Products Corp. – Philadelphia |
| Aliquippa Hospital – Aliquippa | Marine America Corp Bryn Mawr |
| Aliquippa Methodist Church – Aliquippa | Marine Corps Recruiting Depot |
| Aliquippa Southern Railroad Aliquippa | Marine Corps Supply – Basement |
| Aliquippa Steel Co. – Pittsburgh | Marine Leader Chester |
| Aliquippa Welding Service Aliquippa | Marinelli Bakery Philadelphia |
| Aliquippa Works – Woodlawn PA | Maritime Supply Co. Philadelphia |
| Aliquippa Works -Aliquippa | Marker & Sons – McKeesport |
| Aliquippa Works Mill Pipe Shop Aliquippa | Marks Brothers – Philadelphia |
| Aliquippa Works North Mill Aliquippa | Marks Wyant Plumbing Heating Chalfont |
| Aliquippa Works Pipe Shop Station No. 7 Aliquippa | Marlsbary Manufacturing Co. – Union City |
| Aliquippa Works Supply Department Aliquippa | Marlsbary Manufacturing Co. Uniontown |
| Aliquippa Works Truck Station Aliquippa | Marlsbury Plant – Uniontown |
| Aliquippa Works Woodlawn | Marmon Keystone Pipe Supply – Butler |
| Alky Feed System Trainer Philadelphia | Marple Township Delaware County |
| Alky Feed System, Trainer Philadelphia | Marquette Cement – Nequehoning |
| All Clad Metal Crafters – Washington | Marquette Cement Manufacturing Co. – Pittsburgh |
| All State Insurance Co. Office Building Tredyffrin Township | Marquette Cement Manufacturing Co. Neville Township |
| Allan Wood Iron & Steel Co. Ivy Rock | Marquette Cement Neville Island Pittsburgh |
| Alleghany Airport – Pittsburgh | Marquette Cement Pittsburgh |
| Alleghany Ludlum Steel – Clairton | Marriott Hotel – Montour Exit – Moon Twp |
| Alleghany Power Co. – Courtney | Marsden T J Co. – Pottsville |
| Allegheney County Home For Destitute – Pittsburgh | Marsh Plate Glass Co. – Walton |
| Allegheny Airlines Terminal – Pittsburgh | Marshall Brothers & Co. – Newport |
| Allegheny Airport, Pittsburgh Airport – Pittsburgh | Marshall Brothers & Co. Philadelphia |
| Allegheny Boiler & Tube – Versailles | Marshall Kennedy Co. – Pittsburgh |
| Allegheny Brick Creighton | Marshall Kennedy Co. Allegheny |
| Allegheny By-Product Coke Co. – Glassport | Marshalsea Four Arm – Pittsburgh |
| Allegheny Cemetery – Lawrenceville | Marshalsea Four Arm Pittsburgh |
| Allegheny Chemical – Nequehoning | Martin & Nettrour Contracting Pittsburgh |
| Allegheny Chemical – Neville Island | Martin & W H Nixon – Philadelphia |
| Allegheny City Electric Light Co. Allegheny | Martin & W. H. Nixon Manayunk |
| Allegheny Co. Steam Heating Co. – Pittsburgh | Martin & W.H. Nixon – Philadelphia |
| Allegheny College – Meadville | Martin & William H. Nixon Paper Co. Penloyd |
| Allegheny County Airport – Mifflin | Martin Luther King Junior School – Philadelphia |
| Allegheny County Home – Woodville | Martin Luther King School – Philadelphia |
| Allegheny County Home For Destitute – Pittsburgh | Martins Creek Power Plant – Martins Creek |
| Allegheny County Institution District – Woodville | Martins Creek Power Station – Martins Creek |
| Allegheny County Light Co. – Pittsburgh | Martins Creek Powerhouse Martins Creek |
| Allegheny County Poor Farm – Woodville | Martins Creek, P.P.L. – Stroudsburg |
| Allegheny County Sanitary Authority Pittsburgh | Martins Hatchery Poultry Farms, Inc. Lancaster |
| Allegheny County Steam Heating Co. Storeroom Pittsburgh | Marx Toy Factory – Erie |
| Allegheny County Steam Heating Stanwix Plant Pittsburgh | Mary Immaculate Seminary Northampton |
| Allegheny County Workhouse Blawnox | Mary St – Hermitage |
| Allegheny County Workhouse Claremont | Mary Street Project – Kingston |
| Allegheny County Workhouse Hoboken | Mary Wood College – Scranton |
| Allegheny County Workhouse Pittsburgh | Maryland Coal Co. – Hazleton |
| Allegheny Energy Courtney | Maryland Coal Co. Mary D |
| Allegheny Energy Kittanning | Maryland Coal Co. Of Pennsylvania – St. Michael |
| Allegheny Energy Service Corp. Ft. Martin Greensburg | Maryland Coal Co. Philadelphia |
| Allegheny Energy Service Corp. Rivesville Greensburg | Maryland Coal Co. South Fork |
| Allegheny Energy Service Corp. Willow Island Greensburg | Maryland Coal Co. Tuscarora |
| Allegheny Energy Supply Co. Courtney | Maryland Steel Co. – Philadelphia |
| Allegheny Energy Supply Co. Greensburg | Marywood College – Kingston |
| Allegheny Energy Supply Co. Masontown | Mashuda Corp. – Evans City |
| Allegheny Energy Supply Co. Springdale | Masland Duraleather Co. – Philadelphia |
| Allegheny Furnace – Altoona | Maslin Rug Factory – Carlisle |
| Allegheny Gas Co. – Allegheny City | Masonic Homes New Recreation Building Elizabethtown |
| Allegheny Gas Co. – Roulette | Masonic Temple – Pottstown |
| Allegheny Gasket – Bethelport | Masonry Construction Co. – Philadelphia |
| Allegheny Gasket Library | Masonry Inc. – Carnegie |
| Allegheny General Hospital – Pittsburgh | Masontown Brewing Co. Masontown |
| Allegheny Graphic – Kittanning | Masontown Bridge, Hatfield Power Station – Masontown |
| Allegheny Heating Co. Allegheny | Masontown Bridge, Power Station Monongahela |
| Allegheny Industrial Supply – Tarentum | Masontown Jr. High School – Masontown |
| Allegheny Insulation Co. Millvale & Pittsburgh | Mather Co. – Toledo |
| Allegheny Label- Cheswick | Mather Coal – Washington |
| Allegheny Ludlum Leechburg | Mather Collieries – Rices Landing |
| Allegheny Ludlum Steel Corp. Bagdad | Mathis Shipyard |
| Allegheny Ludlum Steel Corp. Brackenridge | Mathis Shipyard – Philadelphia |
| Allegheny Ludlum Steel Corp. Brakenridge | Matthew S. Lewis Co. – Canonsburg |
| Allegheny Ludlum Steel Corp. Clairton | Matthews Conveyor – Ellwood City |
| Allegheny Ludlum Steel Corp. Leechburg | Matthiessen & Hegeler Zinc Co. – Elrama |
| Allegheny Ludlum Steel Corp. Natrona Heights | Mauch Chunk Crystal Ice Co. – Mauch Chunk |
| Allegheny Ludlum Steel Corp. Tarentum | Mauch Chunk H. Power & Electric Light Co. – Mauch Chunk |
| Allegheny Ludlum Steel Corp. Vandergrift | Mauch Chunk Lehighton & Slatington Railway Co. – Allentown |
| Allegheny Ludlum Steel Corp. Washington | Mauch Chunk Lehighton & Slatington Railway Co. – Mauch Chunk |
| Allegheny Ludlum Steel Mold Preparatory Building Brackenridge | Max & Levy Building – Philadelphia |
| Allegheny Ludlum Technologies – Latrobe | Max Brockton Textile Co. – Philadelphia |
| Allegheny Plastics Co. – Coraopolis | Maxton Chester |
| Allegheny Plate Glass Co. – Glassmere | Maxwell Colliery, #20 Ashley |
| Allegheny Plate Glass Co. Hite | Maxwell Lock #5 – Monongahela River, Monongahela |
| Allegheny Power – Greensburg | Maxwell School – Greensburg |
| Allegheny Power – Kittanning | Mayer Body Corp. – Liberty |
| Allegheny Power – Leetsdale | McAdoo Elementary School – McAdoo |
| Allegheny Power Co – Hatfield Ferry Station – Masontown | McArdle & Cooney Inc. – Philadelphia |
| Allegheny Power System, Inc. Masontown | McAvey Brick Co. – Phoenixville |
| Allegheny Refining Co – Verona | Mccahan Sugar Refining & Molasses Co. – Philadelphia |
| Allegheny Shops Allegheny | McCandless Township Municipal – McCandless |
| Allegheny Steel Co. Brackenridge | McCaniel & Harvey Philadelphia |
| Allegheny Valley Hospital – Natrona Heights | Mccann Shields Paint Co. – Pittsburgh |
| Allegheny Valley Street Railway Co. – Pittsburgh | McCarls – Altoona |
| Allegheny Valley Street Railway Co. Tarentum | Mccarter Iron – Norristown |
| Allegheny Valley Water Co. Tarentum | Mccarter Ironworks – Morristown |
| Allegherry County Light Co. – Pittsburgh | Mccarters Iron – Norristown |
| Allen Laundry – Allentown | McCermant Nissan – Allison Park |
| Allen Products Co. – Allentown | Mcclair, Brooks & Co. – Scranton |
| Allen Sherman Hoff Co. – Hamburg | McClaskey & Co. – Philadelphia |
| Allen Sherman Hoff Co. Wynnewood | McClave Brooks & Co. Scranton |
| Allen Stevens Co. – Hazleton | Mcclellan Storage Yard – McClellan |
| Allen, Laundry Allentown | McClenaghan Corp. – Hollidaysburg |
| Allentown & Kurtztown Traction Co. – Allentown | McClintic- Marshall Construction Co. Carnegie |
| Allentown- Bethlehem Gas Co. Allentown | McClintic- Marshall Construction Co. Pottstown |
| Allentown High Rise – Allentown | Mccloskey Construction – Philadelphia |
| Allentown High School – Allentown | Mccloskey Varnish Co. – Philadelphia |
| Allentown Hospital – Allentown | McClure Co. – Washington |
| Allentown Portland Cement Co. – Allentown | McConnell Asbestos & Covering Co. – Etna |
| Allentown Portland Cement Co. – Evansville | McConnellsburg Medical Center – McConnellsburg |
| Allentown Rapid Service Ice Co. – Allentown | McConway & Torley Corp. – Pittsburgh |
| Allentown State Hospital – Allentown | Mccorkel Homes – Carlisle |
| Allentown Water Works – Allentown | McCowell Paper Mill Co. Manayunk |
| Allentown-Bethlehem Gas Co. – Allentown | Mccracken Stark & Co. – Philadelphia |
| Allenwood Steel – Norristown | Mccreary Tire & Rubber Co. – Indiana |
| Allenwood Steel Co. Clearfield | McCreary Tires – Indiana |
| Allenwood Steel Co. Sweedeland | McCrosky Tool & Dye – Meadville |
| Allenwood Steel Conshohocken | McCullough Iron Co. – Philadelphia |
| Allenwood Steel Norristown | McCusker T J Inc. W. Mifflin |
| Allenwood Steel Phoenixville | McDaniel & Harvey – Philadelphia |
| Allianceware – Somerset | McDowell Paper Co. – Manayunk |
| Allied Chemical – Maple Glen | McEnery Co. – Erie |
| Allied Chemical – Newell | McFadden James E Inc. Philadelphia |
| Allied Chemical & Dye Corp. Frankford | McGraw Edison Co – Pittsburgh |
| Allied Chemical & Dye Corp. Philadelphia | McGraw- Edison Co. Canonsburg |
| Allied Chemical Bridesburg Philadelphia | McGraw Edison Co. Lawrenceville |
| Allied Chemical Bridge Street Philadelphia | McGraw Edison Co. Pittsburgh |
| Allied Chemical Co. Frankford Plant Philadelphia | McGraw Edison Co. Power Systems Div Canonsburg |
| Allied Chemical Corp. & Dye Corp. Newell | McGraw Edison Co. Washington |
| Allied Chemical Corp. Bethlehem | McGraw Edison Power Systems Division – Canonsburg |
| Allied Chemical Corp. Bridgesburg | Mcgrew Parkinson & Co. – Monongahela |
| Allied Chemical Corp. Philadelphia | Mcguffey School – Bridgeville |
| Allied Chemical Corp. Sunbury | Mcguffy School Taylorstown |
| Allied Chemical Corp. Youngstown | Mcguinnes Co. – Pittsburgh |
| Allied Chemical Dye Corp. Arrett Division Philadelphia | Mcintosh Co. – Midland |
| Allied Chemical Dye Corp. Barrett Division Philadelphia | McKay Co. – York |
| Allied Chemical Dye Corp. Frankford | McKay Corp. York |
| Allied Chemical Dye Corp. New Phenol Plant Philadelphia | McKean Plant – Farmers Valley |
| Allied Chemical Marcus Hook | McKean Plant Farmers Valley |
| Allied Chemical Newell | McKean, Newhall & Borie – Philadelphia |
| Allied Chemical Philadelphia | McKee Division of Thatcher Glass – Jeannette |
| Allied Chemical Plant – PA | McKee Glass Jeannette |
| Allied Chemical Plant – Philadelphia | McKees Rocks Ind. Enterprises – McKees Rocks |
| Allied Chemical Washington rk, IL | McKeesport & Youghiogheny Ice Co. – McKeesport |
| Allied Mills, Inc. – Everson | McKeesport Coating Co. – McKeesport |
| Allied Services Handicapped – Scranton | McKeesport Hospital – McKeesport |
| Allied Signal – Philadelphia | McKeesport Manufacturing Co. – McKeesport |
| Allied Signal Chemical Plant – Frankford | McKeesport Moose – McKeesport |
| Allis-Chalmers Manufacturing Co. – York | McKeesport Sewage Plant – McKeesport |
| Allis-Chalmers Manufacturing Co. Manchester | McKeesport Tin Plate Co. – McKeesport |
| Allis-Chalmers York | McKeesport Water & Light Co. – McKeesport |
| Alloy Propeller Co. – Zeleinople | McKeesport Water Purification Works – McKeesport |
| Alloy Rod Plant – Hanover | McKeesport Works – McKeesport |
| Alloy Rods Co. & Chemetron Corp. Hanover | McKinley Elementary School – York |
| Alloy Rods Co. & Chemetron Corp. York | McKinney Manufacturing Co. Allegheny |
| Alloy Steel – Southampton | McKnight Lanes North Hills |
| Allstate Distributors Inc – Sharon | Mclaughlin Brothers – Philadelphia |
| Alon Engineering Corp. Pittsburgh | Mclean Newhall & Borie – Philadelphia |
| Alon Engineering, Inc. – Creighton | McMahan Sugar Refining & Molasses Co. Philadelphia |
| Alpha Portland Cement Co. – Easton | McMann Dairy – Altoona |
| Alpha Portland Cement Co. Howells | Meadowlands Suzuki – Meadowlands |
| Alpha Portland Cement Co. Martins Creek | Meadowvale School – Johnstown |
| Alpha Portland Cement Co. MIll #4 Martins Creek | Meadville City Hall – Meadville |
| Alpha Portland Cement Co. Pittsburgh | Meadville Forging Co. Meadville |
| Alpine Knitting Mills – Pittston | Meadville Precision – Meadville |
| Althouse Division – Gibraltor | Meadville Tribune – Meadville |
| Altman Farm – Donegal | Meata Machine Co – New Castle |
| Altman Store, Lancaster Pk. & Iven Rd. – Quarryville | Mechanical Insulation Co. – Lester |
| Altoona & Logan Valley Electric Railway – Altoona | Mechanical Insulation Co. Philadelphia |
| Altoona Area School District – Altoona | Mechanical Insulation Co. Plymouth Meeting |
| Altoona Car Shops – Altoona | Medal Distributing Co. – Sharon |
| Altoona General Hospital – Altoona | Medford’s Inc. – Chester |
| Altoona Mall – Altoona | Medical College of Pennsylvania School – Philadelphia |
| Altoona Pipe & Steel Supply Co. Altoona | Medium Voltage Swgr. Department – Philadelphia |
| Altoona Vocational Technology High School – Altoona | Medusa Cement Co. – York |
| Alts Microwave Electronic – Palo Alto, CA | Medusa Portland Cement Co. – Wampum |
| Alum Creek Township – PA | Medusa Portland Cement Co. York |
| Aluminex, Inc. Reading | Megargee Paper Co. – Edgely |
| Aluminum Co. Of America – Cressona | Megargee Paper Mills – Tullytown |
| Aluminum Co. Of America, Aluminum Plant – Erie | Meijers Stores – Pennsylvania |
| Aluminum Corp. of America Cressona | Meili & Worthington – Hatboro |
| Aluminum Corp. of America Lancaster | Melcroft Coal Co. Melcroft |
| Aluminum Corp. of America Lebanon | Mellon Arena – Pittsburgh |
| Aluminum Corp. of America Logans Ferry | Mellon Bank – Latrobe |
| Aluminum Corp. of America Merwin | Mellon Bank – Ligonier |
| Aluminum Corp. of America New Kensington | Mellon Bank – Oakland |
| Aluminum Corp. of America Pittsburgh | Mellon Bank – Washington |
| Aluminum Smelting Corp. – Philadelphia | Mellon Bank, Old USS Building – Pittsburgh |
| Alvernia College – Millmont | Mellon Institute of Industrial Research – Pittsburgh |
| Am Byers Co. Inc – Pittsburgh | Melville Corbett Co. Kaulmont, Elk County |
| Am Byers Steel Mill, Ambridge | Memorial Hospital – Boiler Room – Johnstown |
| AM Department – Midldletown | Memphis Philadelphia |
| AM Department Middletown | Mens House Of Detention – Philadelphia |
| AM Gas Electric Co. – Philadelphia | Men’s House of Detention Prison |
| Amalgamated Silk Corp. – Allentown | Mercer Alloys Greenville |
| Amber Realty Co. – Philadelphia | Mercer County Courthouse – Mercer |
| Ambric Testing & Engineer Philadelphia | Mercer County Light Co. – Greensburg |
| Ambridge Plant – Ambridge | Mercer High School – Mercer |
| Ambridge Plant – PA | Mercer Lime & Stone Co. Pittsburgh |
| Ambrose Augusterfer Corp. – Hollidaysburg | Mercersburg Tannery Div. Mercersburg |
| Amchem Products Inc. – Ambler | Merchant Shipbuilding Corp. – Bristol |
| Amer Pipe Manufacturing Co. – Philadelphia | Merchants Coal Co. – Merchants Coal Co. |
| Amer Sheet & Tin Plate Co. – Pittsburgh | Merchants Coal Co. Of Pennsylvania – Bosewell |
| Amer Sheet Steel Co. – Pittsburgh | Merchants Coal Co. Stoyestown |
| Amer Steel Hoop Co. – Pittsburgh | Merchants Ship Building Corp. Bristol |
| Amergen Energy Co. Llc, T. M. I. #1 & 2 Middletown | Merck & Co. – Lansdale |
| America Olean Tile Co. Landale | Merck & Co. Building #2 Point |
| America Park Pittsburgh | Merck & Co. Danville |
| America Park Workers – Pittsburgh | Merck & Co. Inc. – Riverside |
| America S. & W. Co. – Pittsburgh | Merck & Co. Lansdale |
| America Sheet Steel Co. – Pittsburgh | Merck & Co. Riverside Borough |
| America Sheet Tin Plate Co. – Pittsburgh | Merck & Co. Riverside |
| America Steel & Wire Co. – Beaver Falls | Merck Chemical – Danville |
| America Steel Hoop Co. – Pittsburgh | Merck Sharpe Dohme Building 65 Point |
| America Water Works & Guarantee Co. – Pittsburgh | Merck, Sharpe & Dohme |
| Americal Betumals & Asphalt Co. – Springdale | Mercy Douglas Hospital – Philadelphia |
| American Aniline Products Co. – Lock Haven | Mercy Hospital – Altoona |
| American Asbestos – Norristown | Mercy-Douglass Hospital – Philadelphia |
| American Asbestos Textile Co. – Norristown | Merion & Radnor Gas & Electric Co. Wayne |
| American Astronaut – Chester | Mermount Gardens – Bryn Mawr |
| American Austin Car Co. – Butler | Merrick Chemical Plant Danville |
| American Axe & Tool Co. – Beaver Falls | Merritt Chapman & Scott – Milton |
| American Axe & Tool Co. Glassport | Messinger Bearings, Inc. Philadelphia |
| American Bank – Lafayette | Mesta Machine Co. – Homer City |
| American Bank Note Co. – Philadelphia | Mesta Machine Co. New Castle |
| American Bantam Car Co. – Butler | Mesta Machine Co. Pittsburgh |
| American Baptist Publication Society – Philadelphia | Mesta Machine Steel Machinery Manu. Plant – Homer City |
| American Bearing Co. – Meadville | Metal Bank of America Philadelphia |
| American Brake Shoe Co. National Bearing Division Meadville | Metal Distributing Co. – Sharon |
| American Brake Shoe Co. New Castle | Metal Treating Co. Pittsburgh |
| American Brake Shoe Factory – Meadowland | Metals Division Near Greensburg |
| American Bridge Co. Ambridge | Metalweld, Inc. Oaks |
| American Bridge Co. Clairton | Methodist Church – Speers |
| American Bridge Co. Economy | Metro Glass – Washington |
| American Bridge Co. Lawrenceville | Metropolitan Brick, Darlington Rd – Beaver |
| American Bridge Co. Neville Island | Metropolitan Edison Co- Portland Generating Station – Portland |
| American Bridge Co. Pencoyd | Metropolitan Edison Co. Dock St. Station Easton |
| American Bridge Co. Philadelphia | Metropolitan Edison Co. Eyler Station Storehouse Reading |
| American Bridge Co. Pittsburgh | Metropolitan Edison Co. Generating Station Unit #1 & #2 Portland |
| American Bridge Division Northampton | Metropolitan Edison Co. Homer City |
| American Bridge Division of U. S. Steel Ambridge | Metropolitan Edison Co. Portland |
| American Bridge Division of U. S. Steel Corp. Pittsburgh | Metropolitan Edison Co. Reading |
| American Bridge Leetsdale | Metropolitan Edison Co. Three Mile Island – Middletown |
| American Bridge Shipyard – PA | Metropolitan Edison Co. Titus Station Reading |
| American Bridge Shipyard – Pittsburgh | Metropolitan Edison Co. Turbine Repair Philadelphia |
| American Can Co. Chambersburg | Metropolitan Edison Co. Upper Mount Bethel |
| American Can Co. Eaton | Metropolitan Edison Co. Williamsburg |
| American Can Co. Fairless Hills | Metropolitan Edison Power Brunners Island York Haven |
| American Can Co. Fairless | Metropolitan Edison Power Plant – Portland |
| American Can Co. Morrisville | Metropolitan Edison- Tmi Harrisburg |
| American Can Co. Palmar Street Philadelphia | Metropolitan Edison-Tmi – Harrisburg |
| American Can Co. Paper Mill Pennington, AL | Metropolitan Hospital – Philadelphia |
| American Can Co. Pennington, AL | Metropolitan Life Insurance Building – Johnstown |
| American Car & Foundry – Wilkes Barre | Meyer Zausner Inc. – New Holland |
| American Car & Foundry Co. – Berwick | Meyers Tavern Elizabeth |
| American Car & Foundry Co. Milton | Meyersdale Jr.-Sr. High School – Meyersdale |
| American Chain & Cable – Braddock | Michael Baker World Headquarters – Beaver |
| American Chain & Cable Co. – Reading | Michael Flynn Manufacturing – Philadelphia |
| American Chain & Cable Co. – York | Michigan Chemical Co. – Pittsburgh |
| American Chain Cable Monessen | Michigan Limestone – Brady |
| American Chain Cable- York | Michigan Limestone & Chemical – Annandale |
| American Chain Co. York | Middle Creek Electric Co. – Sunbury |
| American Cigar Co. – Philadelphia | Middletown Air Force Base – Harrisburg |
| American Clean Tile Lansdale | Middletown Car Co. – Middletown |
| American Coke Co. – Lambert | Middletown Car Works Middletown |
| American Coke Co. Pittsburgh | Middletown Elementary School – Langehorne |
| American Cyamid – Pace, FL | Middletown Elementary School Middletown Twshp |
| American Cyanamid Co. Bessemer | Middletown School – Bornstein |
| American Cyanamid Co. Bridgeville | MidGeneration Homer City |
| American Cyanamid Co. Hughstown | Midland Ross Corp. Pittsburgh |
| American Cyanamid Co. Paa Plant Bridgeville | Midland Ross Sharon |
| American Dredge – Chester | Midland Steel – Beaver Falls |
| American Dredging – Philadelphia | Midland Steel Co. – Midland |
| American Dyewood Co. – Chester | Midland Works – Midland |
| American Eagle Outfitters – Warrendale | Midland-Ross Corp – Pittsburgh |
| American Electronics Lab Colmar | Miduale-Heppenstahl – Philadelphia |
| American Engineering Co. – Philadelphia | Midvale Co. Nicetown, Philadelphia |
| American Gas & Eclectic Co. – Philadelphia | Midvale Co. Philadelphia |
| American Gas & Electric Co. – Chester | Midvale Heppenstall Co. – Eddystone |
| American Gas & Electric Co. – Coxton | Midvale Heppenstall Co. Philadelphia |
| American Hardware Supply – Parkesburg | Midvale Steel & Ordnance Co. Nicetown |
| American Home Food – Millon | Midvale Steel & Ordnance Co. Philadelphia |
| American Industrial Contracting Glenfield | Midvale Steel Co. – Nicetown |
| American Industrial Contracting Oil City | Midvalee Heppenstall Co. Philadelphia |
| American Industrial Contracting Sewickley | Midvalley Coal Co. Centralia Station |
| American Industrial Contractor – Allison Park | Midvalley Coal Co. Mauch Chunk |
| American Insulated Wire Corp. – New Freedom | Midvalley Coal Co. Mt Carmel |
| American Iron & Steel Co. – Lebanon | Midvalley Coal Co. Philadelphia |
| American Iron Steel Manufacturing Co. Lebanon | Midvalley Coal Co. Wilburton |
| American Lace Manufacturing Co. – Germantown | Mifflin Jr. High School – Mifflin |
| American Legion Post 75 – Clairton | Mifflin Schools – Mifflin |
| American Locomotive Co. Allegheny | Mifflin Township |
| American Locomotive Co. Chester | Miklo Construction – Plum |
| American Locomotive Co. Latrobe | Milbon Manufacturing Co. – Milbon |
| American Locomotive Railway Steel Latrobe | Milco Undergarment Co. – Bloomsburg |
| American Machine & Foundry Co. York | Milesburg Power Plant – Milesburgh |
| American Machine Foundry York | Mill #4 Martins Creek |
| American Magnesia & Covering Co. – Plymouth Meeting | Mill Creek Coal Co. Boston |
| American Magnesia & Covering Co. White Marsh Junction | Mill Creek Coal Co. Delano |
| American Metallurgical – New Castle | Mill Creek Coal Co. Vulcan |
| American Motors – Dubois | Mill Creek Powerhouse – Johnstown |
| American Oil Co. – York Lyn | Mill Creek School – Erie |
| American Oil Co. – Yorktown | Mill Machinery & Equipment – Lawrenceville |
| American Olean Tile Co. Lansdale | Mill Strip Division New Castle |
| American Olean Tile Co. Quakertown | Millard Quarry – Annville |
| American Paper Products Co. – Lancaster | Millbourne Mills – Philadelphia |
| American Pile Fabric Co. – Philadelphia | Millcreek Mall – Erie |
| American Pipe Manufacturing Co. – Philadelphia | Miller Gas Oil Shamokin |
| American Radiator & Standard Sanitary Corp. – Pittsburgh | Miller Planner Building Boiler Markleysburg |
| American Radiator Standard Sanitary Corp. Pittsburgh | Miller Printing Machinery Co. Pittsburgh |
| American Railway Co. – Philadelphia | Miller Quarries Inc. – Rushland |
| American Railway Co. Tryone | Miller Robert L – Mechanicsburg |
| American Road Machine Co. – Kettett Square | Millersburg University – Lenhardt Hall – Millersburg |
| American Rolling Mill Co. – Butler | Milliam A Colliery Light & Power – Junction |
| American S. & W. Co. – Pittsburgh | Milliken Hospital Boiler Room – Pottsville |
| American S.& W. Co. Allegheny | Milton Manufacturing Co. – Milton |
| American Salvage Co. – Philadelphia | Minard Run Oil Co. – Bradford |
| American Schack Co. Inc. – PA | Mine – Carmichaels |
| American Sheet & Tin Plate Co, Farreee Works – Farrell | Mine – Jarrets Fort |
| American Sheet & Tin Plate Co. Demmler | Mine – Seward |
| American Sheet & Tin Plate Co. Farreee Works Farreee | Mine – Waynesburg |
| American Sheet & Tin Plate Co. Leechburg | Mine Safety Appliance Co. – Callery |
| American Sheet & Tin Plate Co. Monessen | Mine Safety Appliances – Ridc Industrial Park – Blawnox |
| American Sheet & Tin Plate Co. New Castle | Mine Safety Appliances Co. Callery |
| American Sheet & Tin Plate Co. New Kensington | Mine Safety Appliances Co. Cranberry |
| American Sheet & Tin Plate Co. Pittsburgh | Mine Safety Appliances Co. Evans City |
| American Sheet & Tin Plate Co. Scottdale | Mine Safety Appliances Co. Monroeville |
| American Sheet & Tin Plate Co. Vandergrift | Mine Safety Appliances Co. Penn Center |
| American Sheet Steel Co. Leechburg | Mine Safety Appliances Co. Philadelphia |
| American Sheet Steel Co. McKeesport | Mine Safety Appliances Co. Pittsburgh |
| American Sheet Steel Co. Pittsburgh | Mineral Railroad & Mining Co. – Shamokin |
| American St Gobain Glass Jeanette | Mineral Railroad & Mining Co. Wilkes Barre |
| American St. Gobain – Arnold | Mineral Spring Colliery Wilkes Barre |
| American Standard Trenton | Miners Clinic – Carmichael |
| American Steel & Wire Co. – Pittsburgh | Minersville Housing – Minersville |
| American Steel & Wire Co. Allentown | Minneapolis Honeywell Reg. Co. |
| American Steel & Wire Co. Beaver Falls | Minneapolis Philadelphia |
| American Steel & Wire Co. Braddock | Minnepolis Honeywell Reg. Co. – Philadelphia |
| American Steel & Wire Co. Donora | Minnesota Mining & Manufacturing Co. – Bristol |
| American Steel & Wire Co. New Kensington | Minnotte Manufacturing Co. Rp Pittsburgh |
| American Steel & Wire Co. Pittsburgh | Minotte Brothers Co. – Pittsburgh |
| American Steel & Wire Co. Rankin | Mira Bell, Inc. – Philadelphia |
| American Steel Hoop Co. Allegheny | Miracle Mile Shopping Center – Monroeville |
| American Steel Hoop Co. Pittsburgh | Miseracordia- Student Union & Dorms – Kingston |
| American Steel Wire – Donora | Missile Master Facilities – Oakdale |
| American Steel Wire – New Kensington | Mitchell Power Station – Courtney |
| American Steel Wire – Pittsburgh | Mitchell Power Station Monongahela |
| American Stores Co. Inc – Philadelphia | Mitchell Power Station Washington County Courtney |
| American Sugar Co. – Philadelphia | Mitchell Ps – New Eagle |
| American Telephone & Telegraph – PA | Mitchell, Fletcher & Co. – Philadelphia |
| American Tube & Iron Co. – Middletown | Mobay Chemical Co. – Pittsburgh |
| American Type Founders Co. – Philadelphia | Mobil – Philadelphia |
| American Viscose – Lewistown | Mobil Chemical Co. Rochester |
| American Viscose – Maple Glen | Mobil Oil Corp. Philadelphia |
| American Viscose – Parkersburg, WV | Model Coat Apron Co. Pittsburgh |
| American Viscose – Philadelphia | Model Laundry & Dry Cleaning Co. – Jeannette |
| American Viscose Corp. Maple Glen | Modern Cooling Philadelphia |
| American Viscose Corp. Marcus Hook | Moe A & Co. A – Philadelphia |
| American Viscose Corp. Meadville | Mohawk Carpet Mills) – Phoenixville |
| American Viscose Plant – Lewistown | Mohawk Valley Brewing Co. – Philadelphia |
| American Warming & Ventilating Co. – Altoona | Molded Materials – Ridgeway |
| American Warming Ventilating Co. Pittsburgh | MolyCorp. – Washington |
| American Water Works & Electric Co. – Pittsburgh | Mon Valley Housing Project Monongahela |
| American Water Works & Guarantee Co. – Pittsburgh | Mon Valley Water Co. – Clairton |
| American Welding Co. – Carbondale | Mon Valley Water Pump Station – Elizabeth |
| American Window – Arnold | Monahan Insulation Co. – Pittsburgh |
| American Window House – Jeannette | Monatoe High School – Butler |
| American Zinc & Chemical Co. – Burgettstown | Monessen Steel Co. – Monesson |
| American Zine & Chemical Co. – Langeloth | Monessen Works – Monesson |
| Ames – Parkersburg, WV | Monesson Elementary School – Monesson |
| Ametek Sellersville | Monongahela & Ohio Dredging Co. – Pittsburgh |
| Amjohn Inc. – Carnegie | Monongahela Connecting Railroad Co. – Pittsburgh |
| Amoco Pennsylvania Mobile, AL | Monongahela Electric Light & Power Co. – Homer City |
| Amoroso Bakery – Philadelphia | Monongahela Electric Light Co. – Monongahela |
| Amp, Inc.- Main Office Building – Dauphin County | Monongahela Elementary School – Monongahela |
| Ampco Metals Inc. – Eddington | Monongahela Furnaces – McKeesport |
| Ampco Metals Inc. Eddington | Monongahela Inc. – Line Plane Co. Pittsburgh |
| Amstar Sugar Delaware Avenue Philadelphia | Monongahela Light & Power Co. – Pittsburgh |
| Amstar Sugar Factory – Philadelphia | Monongahela Light & Power Co. Rankin |
| Amstar Sugar Refinery – Philadelphia | Monongahela Melting Co. – Altoona |
| Amtrak Shops – PA | Monongahela Natural Gas Co. – Pittsburgh |
| Anchor Brewing Co. – Tarentum | Monongahela Power Co. – Masontown |
| Anchor Glass Container Corp. – Connellsville | Monongahela Power Station – Monongahela |
| Anchor Hocking Glass Corp. Connellsville | Monongahela Railway – Brownsville |
| Anchor Hocking Glass Corp. Lancaster | Monongahela River Consolidated Coal & Coke Co. California |
| Anchor Hocking Glass Corp. Monaca | Monongahela River Consolidated Coal & Coke Co. Pittsburgh |
| Anchor Hocking Plant, Connellsville | Monongahela Street Railway Co. – Pittsburgh |
| Anchor Supply Co. – Carnegie | Monongalia & Ohio Dredging Co. – Pittsburgh |
| Andrew Kaul Memorial Hospital – St. Marys | Monroe Ship Supply Philadelphia |
| Andy Gard Toy Factory – Leetsdale | Monroeville High School – Monroeville |
| Anita Coal Mining Co. – Punxsutawney | Monroeville Mall – Monroeville |
| Annex Hotel Co. – Pittsburgh | Monroeville Townhouses – Monroeville |
| Anselm School – Pittsburgh | Monsanto Chemical Co. – Philadelphia |
| Anthony Compola Plumbing – Philadelphia | Monsey Products – Kimberton |
| Anthracene Pilot Plant Applied Research Lab Clairton | Monsey Products Co. – Philadelphia |
| Anthracene Pilot Plant Lab Clairton | Monsey Products Kimberton |
| Anthracite Briquette Co. – Sunbury | Monsey Products Wissahicken |
| Anthracite Museum – Ashland | Mont Alto Sanitarium Mont Alto |
| Antioch Building – Pittsburgh | Montefoire Hospital – Pittsburgh |
| Anvil International Columbia | Montgomery Iron Co. – Port Kennedy |
| Ap Green Refractories Division Tarentum | Montgomery Ward – Monroeville |
| Ap Green Refractories Remmey Division – Philadelphia | Montour 10 Mine Pilot Plant Storeroom Library |
| Apollo Gas Co. – Templeton | Montour Cty Danville |
| Apollo Iron & Steel Co – Pittsburgh | Montour High School – Robinson Twp |
| Apollo Iron & Steel Co. – Apollo | Montour No 1 Power Plant Strawberry Ridge |
| Apollo Iron & Steel Co. Templeton | Montour No 1 Power Plant Washingtonville |
| Apollo Iron & Steel Co. Vandergrift | Montour Power Plant |
| Apollo Plant Apollo | Montour Power Plant Washingtonville |
| Apparatus Pittsburgh Service Center Mifflin | Montour Power Station – Montour |
| Appleby Brothers Whittaker Harrisburg | Montour Station Unit #1 & #2 Washingtonville |
| Appleton Paper Mill – Roaring Springs | Montour Steam Elec Station Unit 1, 2 Strawberry Ridge |
| Appleton Paper Mill – Tyrone | Montour Steam Station Pa Power & Light Washingtonville |
| Appleton Papers, Inc. – Roaring Springs | Montour Steel & Iron Co. – Danville |
| Applied Energy Services Corp. – Monaca | Moore College Of Art – Philadelphia |
| Applied Research Center – PA | Moore Pool – Brookline |
| Applied Research Lab Monroeville | Moore Street Elementary School – Millersburg |
| Aquitaine Chemical Co. – Birdsboro | Moorehead Brothers & Co. – Pittsburgh |
| Aranderson – Painted Post | Moorhead Brothers & Co. Sharpsburg |
| Arbogast & Bastlan Co. – Allentown | Morado Beaver County |
| Arbuckle & Co. – Pittsburgh | Moravian College – Bethlehem |
| Arbuckle, Ryan & Co. Inc. – Pittsburgh | Morco- Cochranton |
| Arbutus Village – Johnstown | Morgan Paper Co. – Lititz |
| Arbys Restaurant – Mt. Lebanon | Morganstern Electric – Mifflin |
| Arc Master Enterprise – Latrobe | Morganthaler Brothers – Philadelphia |
| Arcade Building – Philadelphia | Morganza Youth Development Center – Washington |
| Arcade Real Estate Co. – Philadelphia | Morgenthaler Brothers – Philadelphia |
| Archbishop Carroll High School – Quarryville | Morgenthaler Ice Manufacturing Co. – Philadelphia |
| Archibald Colly Archibald | Mormac Co. Lake Chester |
| Architectural Steel – Philadelphia | Mormac Trade Chester |
| ARCO Atlantic Refinery Philadelphia | Mormacbay Co. Chester |
| ARCO Chemical – Newtown | Mormacpride Co. Chester |
| ARCO Chemical Koppers – Monaca | Mormacscan Co. Chester |
| ARCO Chemical Newtown | Moro Phillips – Philadelphia |
| ARCO Chemical Plant – Beaver | Morrell Felin Meat Packers – Philadelphia |
| ARCO Chemical Plant – Kobuta | Morrellsville Colliery Nantyglo |
| ARCO Oil Refinery – Philadelphia | Morris School – Philadelphia |
| ARCO Polymers – Kubota | Morris School 26Th Thompson Philadelphia |
| ARCO Polymers – Monaca | Morristown Railway Co. Philadelphia |
| ARCO ssyunk Avenue & Schulykill River Philadelphia | Moss Rehabilitation Hospital – Philadelphia |
| Arco-Polymers, Inc. – Kabuta | Mother Of Divine Grace – Philadelphia |
| Arcos Corp. Philadelphia | Motion Control – Ridgway |
| Arcwire Corp. – Mt. Carmel | Motion Control Molded Materials Ridgeway |
| Arden Verner Painting – Springdale | Motor Coil Manufacturing – Braddock |
| Argo Mills – Philadelphia | Motor Coils Manufacturing Co. Emporium |
| Argonne – Hog Island | Motor Coils Manufacturing Co. Evans City |
| Argyl Manufacturing Co. – Pen Argyl | Motorola Co. Carlisle |
| Aristech Chemical – Neville Island | Mount Alto Sanitarium – Mont Alto Park |
| Armco – Middletown | Mount Holly Springs – Crumberland County |
| Armco Advanced Materials Corp. Butler | Mount Jesseys Coal Co. – Peckville |
| Armco Ak Steel – Sharon | Mount Joy Vo- Tech Building 432 Old Market Street Mount Joy |
| Armco Ambridge | Mount Lebanous Ice Co. – Mt. Lebanon |
| Armco Specialty Steel Division Butler | Mount Lookout Coal Co. – Wyoming |
| Armco Steel Co. Ambridge | Mount Morich – Philadelphia |
| Armco Steel Co. Butler | Mount Pleasant Electric Light & Power Co. – Mt. Pleasant |
| Armco Steel Co. Middletown | Mount Sinai Hospital – Philadelphia |
| Armco Steel Co. Pittsburgh | Mount St. Joseph Academy – Philadelphia |
| Armco Steel Co. Sharon | Mountain Top Industrial Park – Mountain Top |
| Armco Steel Co. Wheatland | Mountain View Center, Inc. – Kylertown |
| Armco Steel Mill – Butler | Mrs Paul’s Frozen Foods – Philadelphia |
| Armco Steel Saw Hill Tube Division – Wheatland | Msa – Evans City |
| Armco Steel-Ambridge Works Plant – Ambridge | Mt. Hope Church – Mt. Hope |
| Armec – Butler | MT. Lebanon High School – MT. Lebanon |
| Armory – Washington | Mt. Lebanon Methodist Church – Mt. Lebanon |
| Armour & Co. – Philadelphia | MT. Pleasant High School – MT. Pleasant |
| Armour & Co. Crafton | Muhlenberg High School Philadelphia |
| Armour & Co. Philadelphia | Mulligan Harold B – Philadelphia |
| Armour Leather Co. – Kaulmont | Mullins Manufacturing Co. – Hays |
| Armour Slaughterhouse Herrs Island | Munhall High School – Munhall |
| Armstrong Brothers Tool Co. Pittsburgh | Municipal – Ross Township |
| Armstrong Cement Penn- Dixie Cement Cabot | Municipal Authority of Westmoreland City – Greensburg |
| Armstrong Container Supply Lancaster | Municipal Electric Department, Elwood City |
| Armstrong Container Supply Washington | Municipal Electric Dept. Ellwood City Borough – Ellwood City |
| Armstrong Contracting Supply Corp. Harrisburg | Municipal Hospital – Philadelphia |
| Armstrong Contracting Supply Corp. Lancaster | Municipal Service Building City Hall Philadelphia |
| Armstrong Contracting Supply Corp. Philadelphia | Municipality of Ellwood City – Ellwood City |
| Armstrong Contracting Supply Corp. Pittsburgh | Munition Plant – Tacony |
| Armstrong Cork & Insulation Co. – Oakdale | Murphy Mart – Bethel Park |
| Armstrong Cork Armstrong World Industries Lancaster | Murphy Mart – Springdale |
| Armstrong Cork Co. – Beaver Falls | Murray Body Co. – Scranton |
| Armstrong Cork Co. Beaver Falls | Murray Corp. – Scranton |
| Armstrong Cork Co. Building 34- E Lancaster | Muskin Coal Mining Co. – Cairnbrook |
| Armstrong Cork Co. Buildings 403- 408 Lancaster | Muskin Manufacturing Co. – Wilkes Barre |
| Armstrong Cork Co. Digester Liquor Tank Lancaster | Mutual Chemical Division of Allied Chemical & Dye – Philadelphia |
| Armstrong Cork Co. Diller Plank, Inc. Lancaster | Mutual Rendering Co. – Philadelphia |
| Armstrong Cork Co. Linoleum Division Lancaster | Mutual Shoemaker Co. Philadelphia |
| Armstrong Cork Co. Pitt Plant 24Th Street Pittsburgh | Myers Furniture – New Kensington |
| Armstrong Cork Co. Storage Blending Tank Lancaster | N & G Taylor Co. – Philadelphia |
| Armstrong Cork Co. Tanks Hood Pittsburgh | N H Robertson Co. – Ambridge |
| Armstrong Cork Plant – Lancaster | N R S Yewdall – Philadelphia |
| Armstrong County Jail – Armstrong | N. & G. Taylor Co. – Philadelphia |
| Armstrong County Memorial Hospital – Armstrong | N. J. & Penna Traction Co. |
| Armstrong Flooring Plant – Lancaster | N. R. G. Barriers Can Do Industries Park – Hazleton |
| Armstrong Inc. W. W. Pittsburgh | N. R. S. Yewdall – Philadelphia |
| Armstrong Lab Columbia Pike – Lancaster | N. S. – Pittsburgh |
| Armstrong Power Station – Kittanning | N. Snellenburg & Co. – Philadelphia |
| Armstrong Power Station Reesedale | Nabisco – Philadelphia |
| Armstrong Sanitary Wipers – Pittsburgh | Nabisco Plant Penn Ave. – Pittsburgh |
| Armstrong World Industries – Lancaster | Nancy Corp. – Summerville |
| Armstrong World Industries New Brighton | Nanticoke |
| Armstrong World, Ltd. – Lancaster | Nanty Glo Housing Project – Nanty Glo |
| Army Aviation Fac, Hanger & Shops – New Cumberland | NARCO Curwensville |
| Army Reserve Center – Clearfield | NARCO Plant – Womelsdorf Plant – Womelsdorf |
| Arnold Township – Arnold | Nathan R. Yewdall – Philadelphia |
| Arnomink Steam Heat Co. – Drexal Hill | National Airoil Burner Co. – Philadelphia |
| Art Loom Corp – Philadelphia | National Alloy Steel Co. – Blawnox |
| Art Loom Corp. – Philadelphia | National Aniline & Chemical Co. – Maple Glen |
| Arthur C. Mangels Industries Phoenixville | National Aniline Division- USS Chemicals – McKees Rocks |
| Arthur G. McKee Co. Fairless Works Fairless | National Biscuit Co. Cracker Bakery Pittsburgh |
| Asbestos & Magnesia Manufacturing Co. – Port Kennedy | National Biscuit Co. Liberty |
| Asbestos Insulation Co. Norristown | National Biscuit Cracker Bakery Pittsburgh |
| Asbestos, Shingle, Slate & Sheathing Co. Ambler | National Biscuit Plant – Pittsburgh |
| Asg Industries American Window House – Jeannette | National Bond Insulators, Inc. – Allentown |
| Ash Hospital – Allentown | National Borax Co. – Lancaster |
| Ashland Chemical Co. – Pittsburgh | National Can – Fairless Hills |
| Ashland Emery & Corundum Co. – Easton | National Can Corp. Bristol |
| Ashland Oil – Beaver | National Can Fairless Hills |
| Ashland Oil – Elizabeth | National Car Alamo Car Rental – Pittsburgh |
| Ashland Oil – Vanport | National Casket Co. Inc – Pittsburgh |
| Ashland Oil & Refinery Co. – Freedom | National Casting – Sharon |
| Ashland Oil & Refining Co. – Floreffe | National Castings Foundry – Sharon |
| Ashland State Hospital – Ashland | National Container Co. – Bristol |
| Ashley & Bailey Silk Mill – Columbia | National Crucible Co. – Philadelphia |
| Ashley Bailey Silk Mill – Columbia | National Distillers Products Corp. – Broad Ford |
| Asphalt Paving & Supply – Norristown | National Drug Co. Center Valley |
| Asphalt Paving Co. Norristown | National Drug Co. Manufacturing Plant Swiftwater |
| Asphalt Paving Supply Norristown | National Drug Co. Research & Development Building – Swiftwater |
| Asphalt Plant – Pittsburgh | National Drug Co. Research Building Swiftwater |
| Asphalt Plant – Springdale | National Electric – Ambridge |
| Asphalt Products – Pittsburgh | National Electric Products Co. Manufacturing Facility Ambridge |
| Aspinwall Water Plant – Aspinwall | National Foam Co. – Chester |
| Asten Hill Manufacturing – Philadelphia | National Food Products – Beach Glen |
| Asten-Hill – Philadelphia | National Forge & Ordnance Co. – Irwin |
| AT & T Co. Allentown | National Forge Co. Erie |
| AT & T Co. Pottstown | National Forge Co. Irvine |
| AT & T Co. Reading | National Forge Ordnance Irvine |
| At & T Co. Springfield | National Galvanizing Co. – Pittsburgh |
| At&T Technologies – Allentown | National Galvanizing Works – McKeesport |
| AT. & T. Solid State Technology Center – Lehigh County | National Gypsum Co. – Bellefonte |
| Atec Building – Pittsburgh | National Gypsum Co. – Boiler House – New Columbia |
| Athletic Club Of The Schuylkill Navy – Philadelphia | National Gypsum Co. – Milton |
| Athos Steel Mill – Philadelphia | National Heat & Power – Philadelphia |
| Atlanta Boiling Setting Powder Springs | National Lead & Oil Co. Allegheny |
| Atlantic & Gulf Co. – Philadelphia | National Lead Co. Philadelphia Building #9 #30 |
| Atlantic Baking Group, Inc – Pittsburgh | National Lead Co. Pittsburgh |
| Atlantic City Electric – Philadelphia | National Lead Doehler Jarvis Civ Pottstown |
| Atlantic City Power Station – Philadelphia | National Lead Dust Arrester Conical Hopper Philadelphia |
| Atlantic City Railroad – Philadelphia | National Lead Industries, Inc. Pottstown |
| Atlantic Crushed Coke Co. – Greensburg | National Malleable – Sharon |
| Atlantic Electric Motor – Philadelphia | National Material – Arnold |
| Atlantic Flour Mills – Philadelphia | National Mining Co. – Pittsburgh |
| Atlantic Gulf Co. Philadelphia | National Mining Co. Sugar Station |
| Atlantic Metals Corp. – Philadelphia | National Mining Co. Sygam |
| Atlantic Oil Heat White Hall | National Mining Co. Traveskyn |
| Atlantic Oil Refinery – Philadelphia | National Molasses – Philadelphia |
| Atlantic Pipeline Co. – Philadelphia | National Paper Co. – Ransom |
| Atlantic Port Contractors, Inc. – Philadelphia | National Plastics Co. Jeannette |
| Atlantic Refinery Bulk Plant – Harrisburg | National Plumbing – Ellwood City |
| Atlantic Refinery Co. Philadelphia | National Portland Cement Co. – Bethlehem |
| Atlantic Refining Co. Central Warehouse 1 Headquarters Philadelphia | National Portland Cement Co. Brodhead |
| Atlantic Refining Co. Central Warehouse Delivery Track 85 Philadelphia | National Portland Cement Co. Hecktown |
| Atlantic Refining Co. Chester | National Radiator – Duncansville |
| Atlantic Refining Co. Fourth Floor Rear Philadelphia | National Radiator Co. – Johnstown |
| Atlantic Refining Co. Location 1 Philadelphia | National Roll Division – Avonmore |
| Atlantic Refining Co. North Gate Harry Yust – Philadelphia | National Rolling Mill – McKeesport |
| Atlantic Refining Co. North Yard Asphalt Plant – Philadelphia | National Standard Wire of Mount Joy – Mt. Joy |
| Atlantic Refining Co. North Yard Asphalt Plant Philadelphia | National Steel CO. McKeesport |
| Atlantic Refining Co. North Yard Philadelphia | National Steel Co. New Castle |
| Atlantic Refining Co. Philadelphia Refinery – Philadelphia | National Steel Co. Pittsburgh |
| Atlantic Refining Co. Pittsburgh | National Steel Co. Sharon |
| Atlantic Refining Co. Point Breeze Heavy Fuel Addition – Philadelphia | National Steel Service Center, Inc. New Castle |
| Atlantic Refining Co. Point Breeze Refinery – Philadelphia | National Sugar Co. Philadelphia |
| Atlantic Refining Co. Point Breeze Wax Plant – Philadelphia | National Sugar Philadelphia |
| Atlantic Refining Co. Refinery North Yard Gate Tank Philadelphia | National Sugar Refinery |
| Atlantic Refining Co. Research Development Center – Philadelphia | National Sugar Refinery Co. – Philadelphia |
| Atlantic Refining Co. Schuylkill & Lanier – Philadelphia | National Supply Co. Ambridge |
| Atlantic Refining Co. Schuylkill & Lanier Philadelphia | National Supply Co. Etna |
| Atlantic Refining Co. Tanks # 1264 1265 Philadelphia | National Supply Co. Pittsburgh |
| Atlantic Refining Co. Tanks # 1264, 1265 – Philadelphia | National Tire & Battery – North Hills |
| Atlantic Refining Co. Warehouse Loc Nbr 1 – Philadelphia | National Torch Tip – Aspinwall |
| Atlantic Refining Co. Wolstons Woods Yard – Philadelphia | National Tube Co. Chester |
| Atlantic Richfield Barge Loading Facilities Philadelphia | National Tube Co. Division National Works McKeesport |
| Atlantic Richfield Central Warehouse Location 1 Philadelphia | National Tube Co. Ellwood City |
| Atlantic Richfield Co. – Point Breeze | National Tube Co. Monongahela Furnaces McKeesport |
| Atlantic Union Resources, Inc. Philadelphia | National Tube Co. Pennsylvania Department Pittsburgh |
| Atlas Cement Co. – North Hampton | National Tube Co. Philadelphia |
| Atlas Chemicals Inc. Mertztown | National Tube Co. Pittsburgh |
| Atlas Mineral Products Inc. – Mertztown | National Tube Division National Works McKeesport |
| Atlas Portland Cement Co. – North Hampton | National Tube Works Co. – McKeesport |
| Atlas Powder Co. – Reynolds | National Tube Works Co. McKeesport |
| Atochem North America Philadelphia | National Tube Works Co. Versailles |
| Atomic Apparatus Subdivision Office Large | National Tube Works McKeesport |
| Atomic Energy Plant Shippingport | National Valve – Johnstown |
| Atomic Power Div. – Forrest Hills | National Valve & Manufacturing Pittsburgh |
| Atomic Power Plant Beaver | National Valve Co. – Etna |
| Atomic Power Station – Pittsburgh | National Valve Co. Johnstown |
| Auburn Brick Co. Auburn | National Valve Co. Lawrenceville |
| Auburn Engineering – Pittsburgh | National Valve Manufact Pittsburgh |
| Audenried #4 Coll – Aurenreid | National Vulcanized Fiber – Kettett Square |
| Auditorium, Danville State Hospital Danville | National Vulcanized Fiber Co. – York Lyn |
| August Wagner Breweries, Inc. – Pittsburgh | National Vulcanized Fiber Kennett Square |
| Aurora Furnace Co. Wrightsville | Natrona Heights Power Plant, Natrona Heights |
| Ausco St Joseph | Natural Gas Pipeline – Nazareth |
| Austin Construction – Duryea | Navaco. – Lawrenceville |
| Auto Car Co. – Ardmore | Naval Air & Research Center |
| Auto Steam Equipment Co. – Philadelphia | Naval Air Station – Philadelphia |
| Autocar Trucks Exton | Naval Aviation Supply Depot – Philadelphia |
| Automotive & Railcar Assembly Plant – Philadelphia | Naval Boiler & Turbine Laboratory School – Philadelphia |
| AVCO. Spencer Div. Williamsport | Naval Dry Dock – Philadelphia |
| Ave Apartments – Huntingdon Valley | Naval Ordnance Works – Midland |
| Avella Water Treatment Plant – Avella | Naval Ship Engineering Center – Philadelphia |
| Avtex Fibers Inc. – Maple Glen | Naval Supply Depot – Mechanicsburg |
| Aylwin – Philadelphia | Navasota Co. Chester |
| A-Z Paper Co. Philadelphia | Navy Propulsion Plant – Greensburg |
| B & O Railroad – Fitz Henry To Layton | Navy Yard – Philadelphia |
| B & O Railroad – Glenwood | Navy Yard Dry Dock – Philadelphia |
| B & O Railroad – New Castle | Nazareth Cement Co. – Nazareth |
| B & O Railroad – Sharon | Nazareth Cement Plant – Nazareth |
| B & W Main Tube Plant – Beaver Falls | Nazareth Hospital – Philadelphia |
| B F Goodrich Tire Co. – Oaks | Nazareth Portland Cement Co. – Nazareth |
| B Knox Coraopolis | Nazareth Steel Fabricators – Nazareth |
| B N Saul Hardware Builders Supply – Apollo | NCC Pet Food Corp. Laddie Philadelphia |
| B. & W. Main Tube Plant – Pittsburgh | NCO – Robinson Township |
| B. F. Goodrich Tire & Rubber Plant – Oaks | Neals Welding & Fabricating Steelton |
| B. F. Refinery – Maple Glen | Neatsfoot Oil Refineries – Philadelphia |
| B. F. Refinery Marcus Hook | Neatsfoot Oil Refineries Philadelphia |
| B. Levy Estate – Titusville | Nelson Valve Co. – Chestnut Hill |
| B. P. Oil Co. Chester | Nelson Valve Co. – Philadelphia |
| B. P. Oil Co. Philadelphia | Nemaugh Station- Indiana Co Unit #2 – Huff |
| B. P. Oil Corp. Hook Refinery Marcus Hook | Nesbitt Manufacturing Co. – Philadelphia |
| B. R. P. Roundhouse Puxsatawney | Neshaminy High School – Langehorne |
| B. V. H. Hotel Associates Philadelphia | Neshaminy Nursing – Doylestown |
| B. W. Main Tube Plant Pittsburg | Nesque – Hominy |
| Babcock & Wilcox Co. Ambridge | Neville Chemical Co. Nequehoning |
| Babcock & Wilcox Co. Beaver | Neville Chemical Co. Neville Island Store Room Pittsburgh |
| Babcock & Wilcox Co. Coppel | Neville Chemical Co. Pittsburgh |
| Babcock & Wilcox Co. Ellwood City | Neville Co. Neville Island |
| Babcock & Wilcox Co. Homer City | Neville Island – Morton |
| Babcock & Wilcox Co. Koppel Plant Koppel | Neville Island Coke & Chemical – Nequehoning |
| Babcock & Wilcox Co. Koppel Works – Beaver Falls | Neville Island Pittsburgh |
| Babcock & Wilcox Co. Koppel Works Beaver Falls | Neville Island Shipyards – Neville Island |
| Babcock & Wilcox Co. Laurence County | Neville St. Apartments – Pittsburgh |
| Babcock & Wilcox Co. Main Plant – Beaver Falls | New A & B Foundry Inc. Connellsville |
| Babcock & Wilcox Co. Main Tube Plant Mayfield | New Air Cond System Closure Plant – Lancaster |
| Babcock & Wilcox Co. Masontown | New Brighton High School – New Brighton |
| Babcock & Wilcox Co. Middletown | New Castle & Lowell Railway Co. – Edinburg |
| Babcock & Wilcox Co. Monessen | New Castle Electric Co. – New Castle |
| Babcock & Wilcox Co. Philadelphia | New Castle Junior High School – New Castle |
| Babcock & Wilcox Co. Pittsburgh | New Castle Light, Heat & Power Co. – New Castle |
| Babcock & Wilcox Co. Seamless Tube Plant – Beaver Falls | New Castle Meat Packing Co. – New Castle |
| Babcock & Wilcox Co. Steel Mills Beaver Falls | New Castle Plant – New Castle |
| Babcock & Wilcox Co. Tube Co. Beaver Falls | New Castle Portland Cement Co. New Castle |
| Babcock & Wilcox Co. Tubular Products Division Ambridge | New Castle Power Generating Station – New Castle |
| Babcock & Wilcox Co. Tubular Products Division Beaver Falls | New Castle Railway Co. |
| Babcock & Wilcox Co. Tubular Products Division Koppel | New Castle Railway Co. Evans City |
| Babcock & Wilcox Co. Wallace Run Plant – Wallace Run | New Castle Shovel Co. – New Castle |
| Babcock & Wilcox Co. Works – Beaver Falls | New Castle Stamping Co. – New Castle |
| Backos & Johns Lumberyard – Pitcairn | New Castle Station – Pittsburgh |
| Badeer Adamson & Co. – Philadelphia | New Castle Vo- Tech School – New Castle |
| Badenhauser – Cornwell Heights | New Castle Water Co. – New Castle |
| Badger Corp Benzoil Plant 8 – Clairton | New Cumberland Army Depot – New Cumberland |
| Badger Us Steel Chem Plant – Nequehoning | New Cumberland General Depot – New Cumberland |
| Badwell Co. – Harrisburg | New Duquesne Science Hall – Pittsburgh |
| Baeder Adamson & Co. – Philadelphia | New Eagle Power Station – New Eagle |
| Bagdad Plant – Leechburg | New Federal Building – Pittsburgh |
| Bailey Banks & Biddle Building – Philadelphia | New Federal Office Building – Philadelphia |
| Bailey High School – Pittsburgh | New Florence High School – New Florence |
| Baird Insulation Co. – Chambersburg | New Jersey & Pennsylvania Traction Co. Yardley |
| Bairel Chevrolet – Wexford | New Jersey Mills – Philadelphia |
| Baker Adamson Plant Marcus Hook | New Jersey Zinc Co. Bethlehem |
| Baker Carver & Morrel – Philadelphia | New Jersey Zinc Co. Center Valley |
| Baker Chain & Wagon Iron Manufacturing Co. Allegheny | New Jersey Zinc Co. Freemansburg |
| Baker Co. J. E. – York | New Jersey Zinc Co. Friedensville |
| Baker Elementary School – Altoona | New Jersey Zinc Co. Hazard |
| Baker, Smith & Co. – Pittsburgh | New Jersey Zinc Co. of Pennsylvania Plant, Plamerton |
| Bala Cynwyd Junior High School – Bala Cynwyd | New Jersey Zinc Co. Plant Z Palmerton |
| Balch Flavor Co. Inc. Pittsburgh | New Jersey Zinc Refinery Smelter – Palmerton |
| Bald Eagle Chemical – Mill Hall | New Jr High School – Troy |
| Baldt Anchor Forge Co. Chester | New Kensington Auto Parts – New Kensington |
| Baldt Anchor, Chain Forge Co. Chester | New Kensington High School – New Kensington |
| Baldwin Automotive – Essington | New Kensington Hospital – New Kensington |
| Baldwin Court Apartments – Baldwin | New Kensington Housing Project – New Kensington |
| Baldwin Fire Hall No. 1 – Baldwin | New Kensington Water Authority Pump Station – New Kensington |
| Baldwin Lima Hamilton – Chester | New Office Building – Lancaster |
| Baldwin Lima Hamilton Corp. Burnham | New Oxford Junior High School – New Oxford |
| Baldwin- Lima- Hamilton Corp. Eddystone | New Pellet Plant – Cornwall |
| Baldwin Locomotive Philadelphia | New Process – Warren |
| Baldwin Locomotive Works – Burnham | New Recreation Selinsgrove Center – Selinsgrove |
| Baldwin Locomotive Works Eddystone | New River & Pocahontas Consolidated Coal Co. – Philadelphia |
| Baldwin Locomotive Works Philadelphia | New River Rocahontas Consolidated Coal Co. – Philadelphia |
| Baldwin-Ehert- Hill Inc. -Valley Forge | New Secondary School – Wyalusing |
| Baldwin-Ehert-Hill Inc. – Port Kennedy | New Senior High School – Lancaster |
| Baldwin-Lima-Hamilton Corp. Burnham | New Sr. High School – Lancaster |
| Baldwin-Lima-Hamilton Corp. Eddystone | New Steel Buidlings, Spang Steel Co. – Butler |
| Ball Engine Co. – Erie | New Steel Building – Butler |
| Ballied Chemical & Dye Corp. Philadelphia | New Williamsport High School – Wiliamsport |
| Baltimore & Ohio Railroad Co. Connellsville | New Wilmington City Hall & Courthouse – New Wilmington |
| Baltimore & Ohio Railroad Co. Dubois | New York & Penn Co, Inc. – Johnsonburg |
| Baltimore & Ohio Railroad Co. Glenwood | New York & Pennsylvania Co, Inc. – Lock Haven |
| Baltimore & Ohio Railroad Co. New Castle Junction | New York & Pennsylvania Co. – Johnsonburg |
| Baltimore & Ohio Railroad Co. Philadelphia | New York & Pennsylvania Paper Co – Boiler Room – Haven |
| Baltimore & Ohio Railroad Co. Pittsburgh | New York Central & Hudson River RR, Penn Central, Harmon Yard |
| Baltimore Electrical Power Plant – Parsons | New York Gas Compressor Station – Delmont |
| Baltimore Ohio Railroad Co. Division Sk Section a New Castle | New York Natural Gas Corp. Sabinsville |
| Baltimore Ohio Railroad Co. Division Sk Section C, Loco. Shops Dubois | New York Penn Co. Inc. Johnsonburg |
| Baltimore- Ohio RR – Evans City | New York Penna Co. Lock Haven |
| Bangor Electric Light, Heat & Power Co. – Bangor | New York Pennsylvania Co. Inc. Johnsonburg |
| Bank Of North America – Philadelphia | New York Pennsylvania Co. Inc. Lock Haven |
| Banks Morton Pittsburgh | New York Pennsylvania Paper Co. Boiler Room Lock Haven |
| Banning RD. – Lower Tyrone Township | New York Philadelphia & Norfolk Railway Co. – Philadelphia |
| Bantam Car Works – Evans City | New York Shipbuilding Co. – Philadelphia |
| Barbados Island Power Plant – Norristown | New York Shipping – Philadelphia |
| Barbados Island Power Plant Barbados Island | New York State Electric & Gas Co. Homer City |
| Barber Asphalt Paving Co. Philadelphia | New York State Electric & Gas Corp. – Lawrenceville |
| Bard Insulation Co. Chambersburg | New York State Natural Gas – Sabinsville Compressor Station – Sabinsville |
| Bargain City – Philadelphia | New York State Natural Gas Co. – Delmont |
| Barkley Apartments – Philadelphia | New York State Natural Gas Co. 86 Pump Station Lane Lawrenceville |
| Barkley Lumber Supply – Listonburg | New York State Natural Gas Co. Leidy Station Renovo |
| Barnes Construction Co. – New Castle | New York State Natural Gas Co. Oakford Compressor Station Delmont |
| Barnes Tucker Coal Carrolltown | New York State Natural Gas Co. Sabinsville Compressor Station Sabinsville |
| Barney Co- Philadelphia | New York State Natural Gas Co. Tonkin Station Murraysville |
| Barnum Breaker – Pittston | New York Wilkins Co. Engineers – Pittsburgh |
| Barnum Colliery – Pittston | New York Wire Cloth Co. – York |
| Barone Launch Service – Philadelphia | Newark Processing Co. – Chester |
| Barret Div Allied Chemical & Dye Corp. – Philadelphia | Newburn Glass Co. – Royersford |
| Barrett Chemical Co. Philadelphia | Newcor – Mueller |
| Barrett Co. – Bethlehem | Newell Chemical – Newell |
| Barrett Co. Frankford | Newman & Co. Inc – Philadelphia |
| Barrett Div Allied Chemical & Dye Corp – Philadelphia | Newton Coal Mining Co. – Pittston |
| Barrett Manufacturing Co. – Frankford | Newton Paper Co. Newton |
| Barretts Roofing – Philadelphia | Nice Ball Bearing – Kulpsville |
| Barron College – Erie | Nice Ball Bearing Co. – Philadelphia |
| Barrones Launch Serv Inc – Philadelphia | Nice Ball Bearing Kulpaville |
| Barry’s Home Improvements – Cherry Tree | Nicetown Plate Washer Co. – Nicetown |
| Bart Colerain Elementary School – Bartville | Nicetown Station – Philadelphia |
| Bartels Brewing Co. – Kingston | Nicholson File Co. – Philadelphia |
| Bartels Brewing Co. – Pennsylvania | Nicholson File Co. Red Lion Philadelphia |
| Bartoletta Packard – Braddock | Nick Istock Inc. – Aliquippa |
| Bartolotto Supermarket – Monongahela | Nickel Plumbing & Heating – Pittsburgh |
| BASF Corp. Butler | Nicolet Industries – Ambler |
| Bashland Chemical Co. – Pittsburgh | Nicolet Industries Lansdale |
| Basic Construction Co. – Philadelphia | Nicolet Industries Norristown |
| Bath Portland Cement Co. – Bath | Nicolette Industries Ambler |
| Bath Portland Cement Co. Sands Eddy | Niles Bement Pond Co. – Philadelphia |
| Baugh Chemical – Philadelphia | Niles Building – Philadelphia |
| Baum Boulevard Volvo Pittsburgh | Niles-Bement Pond Co. Philadelphia |
| Bayamon Chester | Niles-Bement-Pond Co. – Nicetown |
| Bayless Pulp & Paper Co. – Austin | Ninos Auto Body – Braddock |
| Beach Bottom Nuclear Power Station – Delta | Nixon Theatre – Pittsburgh |
| Beacon Light Co. – Chester | Nm. Penn Colliery – Shaft |
| Beam Yard Powerhouse – Johnstown | No 2 Shaft – Williamstown |
| Bear Gap Water Co. – Shamokin | No Am Refr Curwensville |
| Bear Valley #1 Boiler House – Williamstown | Noah Barlow – Philadelphia |
| Bear Valley Shaft – Williamstown | Noble Drilling – Paul Romano, Inc. |
| Beaumont Birch Co. – Philadelphia | Noble J. Dick Office Building Large |
| Beaver Coal & Coke Co. – Wampum | Nordberg – Pastorel, Minneapolis Power Plant |
| Beaver College – Glenside | Norfolk & Western Railroad – Erie |
| Beaver County Geriatric Center – Beaver | Norfolk Southern Corp. – Hollidaysburg |
| Beaver County Home & Hospital – Beaver | Norfolk Western Railroad Erie |
| Beaver County Jail – Beaver | Norfolk Western Shops |
| Beaver County Light Co. – Fallston | Norland Shipping & Trading Co. – Morrisville |
| Beaver Falls Medical Center – Beaver Falls | Norris Smelting & Refining – Swedeland |
| Beaver Falls Plaza – Beaver Falls | Norristown Hospital – Norristown |
| Beaver Falls Sewage Treatment – Beaver Falls | Norristown Magnesia & Asbestos Co. – Norristown |
| Beaver Hill Apartments – Jenkinstown | Norristown Municipal Sanitation Department – Norristown |
| Beaver Hospital – Beaver | Norristown Municipal Sanitation Dept. – Norristown |
| Beaver Meadow Collierty – Drifton | Norristown Post Office – Norristown |
| Beaver Meadow Colliery – Beaver Meadow | Norristown State Hospital – Norristown |
| Beaver Meadow Colliery Drifton | Norristown U. S Post Office Norristown |
| Beaver Run Coal Co. Philadelphia | North Allegheny High School – Wexford |
| Beaver Stadium – Beaver | North American Coal Co. Conemaugh |
| Beaver Valley Atomic Power Plant – Beaver Valley | North American Construction Co. – Pittsburgh |
| Beaver Valley General Hospital – New Brighton | North American Lace Co. – Philadelphia |
| Beaver Valley Heat Treating – Beaver Valley | North American Refractories Co. Pittsburgh |
| Beaver Valley Mall – Monaca | North American Refractories Co. Womelsdorf |
| Beaver Valley Medical Center – Beaver | North American Refractory Curwensville |
| Beaver Valley Nuclear Power Plant – Sharon | North American Rockwell New Castle |
| Beaver Valley Nuclear Power Plant Shippingport | North American Rockwell Pittsburgh |
| Beaver Valley Power Station Unit Shippingport | North American Rockwell Reading |
| Beaver Valley Traction Co. Beaver Falls | North American Smelting Co. Philadelphia |
| Beaver Valley Traction Co. Economy | North Belle Vernon Elementary School – Belle Vernon |
| Beaver Wire Co. Beaver Falls | North Branch Steel Co. – Danville |
| Beazer Pittsburgh | North Brothers Co. – Coatesville |
| Bechtel Bettis, Inc. – Mifflin | North Brothers Manufacturing Co. – Philadelphia |
| Bechtel Steel Plant – Martins Creek | North Cambia St. Railway Co. – Pittsburgh |
| Becks Run Station – Pittsburgh | North Cambria Railway Co. – Patton |
| Beckwith Mach – Harrisburg | North Cambria Railway Co. Pittsburgh |
| Beckwith Machinery – Murraysville | North Charleroi Elementary School – Charleroi |
| Bedford Memorial Hospital – Bedford | North Cornwall Furnace Co. – Cornwall |
| Bedford Roller Arena – Bedford | North Cumberland Co. Riverside |
| Bedford Shopping Center – Bedford | North Hampton High School – North Hampton |
| Beeber Junior High School – Philadelphia | North Huntington Twp High School Irwin |
| Beech Bottom Station -Delta | North Pipe Shop Station 270 Aliquippa |
| Beechwood Inn – Jenkinstown | North Reserve Basin Philadelphia |
| Belfonte Works Building N Bellefonte | North Savings Bank – Franklin |
| Bell- Meade SR. Citizen Center – Washington | North Sewickley Township Beaver County |
| Bell Telephone – Allentown | North Side of Industrial Highway – Eddystone |
| Bell Telephone – Altoona | North Side Packing Co. – Pittsburgh |
| Bell Telephone – Bentleyville | North Washington School – Apollo |
| Bell Telephone – Bethel Park | North Water Pollution Control Plant Philadelphia |
| Bell Telephone – Braddock | Northampton Traction Co. – Easton |
| Bell Telephone – Carnegie | North Collierty – Carbondale |
| Bell Telephone – Carrick | Northeastern Water Co. – Hundsondale |
| Bell Telephone – Clairton | Northeastern Water Co. |
| Bell Telephone – Clarion | Northern Cambria SR. High School – Barnesboro |
| Bell Telephone – Crabtree | Northern Light T- Ak- 284 Chester |
| Bell Telephone – Crafton | Northern Lights Shopping Center – Baden |
| Bell Telephone – Dubois | Northern Metals Co. – Tacony |
| Bell Telephone – Elizabeth | Northern Ore Co. Easton |
| Bell Telephone – Franklin | Northside Cooperage Co. Pittsburgh |
| Bell Telephone – Greensburg | Northview Heights Elementary School – Pittsburgh |
| Bell Telephone – Holidaysburg | Northview Housing – Pittsburgh |
| Bell Telephone – Indiana | Northview Housing, Hazlet & Spring Hill – Pittsburgh |
| Bell Telephone – Johnstown | Northwestern Mining & Exchange Co. Hellen Mills |
| Bell Telephone – Liberty | Northwestern Pennsylvania Railway Co. – Meadville |
| Bell Telephone – Ligonier | Norwin Junior High School – Norwin |
| Bell Telephone – McKees Rocks | Norwin Shopping Center – North Versailles |
| Bell Telephone – McKeesport | Nosco – Erie |
| Bell Telephone – Murrysville | Nottingham Colliery – Plymouth |
| Bell Telephone – New Kensington | Novingers, Inc. – Harrisburg |
| Bell Telephone – Pittsburgh | NTF Equip Co. – Moon Township |
| Bell Telephone – Sharon | Nuclear Mat Equip Corp. Apollo |
| Bell Telephone – Spangler | Nuclear Materials & Equipment Co. Plant Apollo |
| Bell Telephone – Squirrel Hill | Nuclear Materials & Equipment Corp. Numec – Apollo |
| Bell Telephone – Tarentum | Nuclear Power- Foster Wheeler – Panama City |
| Bell Telephone – Turtle Creek | Number 1 Number 4 Blast Furnace Johnstown |
| Bell Telephone – Uniontown | Number 10 Breaker Pittston |
| Bell Telephone – Washington | Number 2 Shaft Colliery Kingston |
| Bell Telephone – Youngwood | Number 3 Boilder House Nicetown, Philadelphia |
| Bell Telephone Building – Philadelphia | Number 3 Rollilng Mill – Johnstown |
| Bell Telephone Co. – Connellsville | Number 4 Breaker Kingston |
| Bell Telephone Co. Of PA – Warren | Number 4 Rolling Mill – Johnstown |
| Bell Telephone Co. Pittsburgh | Number 5 & Number 6 Blast Furnace – Johnstown |
| Bell Telephone Co. Sharpsburg | Number 6 & 8 Bolliery Pittston |
| Bellefield Boder Plant – Pittsburgh | Number 6 Colliery – Inkerman |
| Bellefield Hotel – Pittsburgh | Number 6 Electric Powerhouse – Parsons |
| Bellefonte Electric Co. – Bellefonte | Number 8 Grutier Mill – Johnstown |
| Bellefonte Gas Co. – Bellefonte | Number 9 Breaker Pittston |
| Belleour Stratford Hotel Co. – Philadelphia | Number 9 Collier Pettston |
| Bellevue Stratford Hotel Co. – Philadelphia | Nursing Home – Butler |
| Bellfield Boiler House Panther Hollow – Oakland | Nursing Home – Washington |
| Belmont Oil Works Belmont Petroleum Refinery Philadelphia | Nutec Tooling Systems – Meadville |
| Belmont Oil Works Philadelphia | Nutrition Products – Philadelphia |
| Belmont Petroleum Refinery – Philadelphia | Nuttal Works – Pittsburgh |
| Belmont Refinery – Point Breeze | NY PA Co. Johnsonburg |
| Belton Wire Corp. – Washington | O Amos Co. Div McDonough C Philadelphia |
| Bement, Miles & Co. – Philadelphia | O Hora John F & Sons Scranton |
| Ben Franklin Elementary School – Levittown | O. C. Cluss Lumber Co. – Union City |
| Ben Franklin Hotel – Philadelphia | O. F. Zurn Philadelphia |
| Bendix Aircraft – Philadelphia | O. Hommel Co. – Carnegie |
| Bendix Corp. – Wilkes Barre | Oak Summit Apartments – Philadelphia |
| Bendix Westinghouse Co. – Wilmerding | Oak Summit Apts – Philadelphia |
| Benjamin Foster Co. – Philadelphia | Oakhurst Homes – Johnstown |
| Benjamin Franklin Elementary – Philadelphia | Oakmont Elementary School – Oakmont |
| Benjamin Franklin Elementary School – Philadelphia | Oakmont High School – Oakmont |
| Benjamin Franklin Junior High School – New Castle | Oakmont Medical Center – Oakmont |
| Benjamin Rush Middle School – Philadelphia | Oakmont Water Treatment Plant – Oakmont |
| Bennett & Aspen – Philadelphia | Oakwood School – View |
| Bennett Station – Wilkes Barre | O’Brien Machinery Co. |
| Bennett Steel, Inc. – Wilkes Barre | O’Brien Machinery Co. – Philadelphia |
| Bensalem High School – Bensalem | Obrien Rubber Co. Thread & Webbing Co. Catasauqua |
| Bensol Boiler House Clairton Works Clairton | Occidental Chemical Co. Pottstown |
| Bensol Plant Coke Oven Division Bethlehem | Ocean Coal Co. – Herminie |
| Benzol Products Co. – Maple Glen | Ocean Coal Co. Philadelphia |
| Benzol Products Co. Marcus Hook | Office & Whse. R. C. A. – Lancaster |
| Bepsilon Zeta Alumni Association Pi – Philadelphia | Office Building 1500 Walnut Street Philadelphia |
| Beravac Funeral Home – Clairton | Office Warehouse R. C. A. Lancaster |
| Berg St – Johnstown | Ohio & Pittsburgh Milk Co. – Pittsburgh |
| Bergner & Engle Brewing Co. – Philadelphia | Ohio Pennsylvania System – New Castle |
| Berillium Corp. – Temple | Ohio Power Co. Philadelphia |
| Berks Refining Co. – Pottstown | Ohio Rubber Co. – Conneautville |
| Berks Vocational School – Berks County | Ohio Service Co. – Philadelphia |
| Berkshire Insulation Co. Reading | Ohio Spring Specialties Leechburg |
| Berliner Co. Joseph – Philadelphia | Oil City Glass Co. Division Natl Can Oil City |
| Berry Metals – Mars | Oil City, Health Center – Oil City |
| Bers & Co. – Philadelphia | Oil Heat Service Middleburg |
| Berwick Forge & Fabricating – Berwick | Oil Refinery Oil City |
| Berwick Hospital – Berwick | Oil Tanks – McKees Rocks |
| Berwick Nuclear Station – Wilkes Barre | Oil Well Supply Co – Oil City |
| Berwick, City Of – Berwick | Oilwell Div US Steel Oil City |
| Berwin White Coal Co. Windber | Oklahoma City Philadelphia |
| Berwin White Coal Mining Co. – Philadelphia | Oklahoma Gas & Electric – Ponca City |
| Berwind Coal Co. – Johnstown | Okonite Co. – Wilkes Barre |
| Berwind White Coal Mining Co. Dubois | Okonite Co. Hazard Wire Rope Wilkes Barrre |
| Berwind White Coal Mining Co. Dunlo | Old Croatin School – New Castle |
| Berwind White Coal Mining Co. Eureka | Old Folks Home – Holidaysburg |
| Berwind White Coal Mining Co. Horatio | Old Forge Breaker – Dunmmon |
| Berwind White Coal Mining Co. Lindsey | Old Forge Collieries – New Avoca |
| Berwind White Coal Mining Co. Osceola | Old Forge Collieries Scranton |
| Berwind White Coal Mining Co. Philadelphia | Old Fourth Ward School – Pittsburgh |
| Berwind White Coal Mining Co. Scalp Level | Old Meadow Works – Pittsburgh |
| Berwind White Coal Mining Co. Windber | Old Penn Railroad Station |
| Beryllium Corp. – Hazleton | Old Reading Brewery, Inc. Reading |
| Beryllium Corp. Reading | Oldman Boiler Works – Erie |
| Beryllium Corp. Temple | Olin Mathieson Chemical – Lake Charles |
| Bessemer & Lake Erie Railroad Co. – Greensburg | Olin Mathieson Chemical Corp. – McKees Rocks |
| Bessemer Cement – New Castle | Oliver & Roberts Wire Co. – Pittsburgh |
| Bessemer Coke Co. – Pittsburgh | Oliver & Snyder Steel Co. – Pittsburgh |
| Bessemer Limestone Co. – Walford | Oliver & Snyder Steel Co. Allegheny |
| Bessemer Steel Works – Johnstown | Oliver & Snyder Steel Co. Oliver |
| Bethayres Co. – Bethayres | Oliver & Snyder Steel Co. Pittsburgh |
| Bethel Park Borough- Sewage Treatment Plant – Bethel Park | Oliver Building – Pittsburgh |
| Bethel Park Municipal – Bethel Park | Oliver Iron & Steel Co. – Pittsburgh |
| Bethel Senior High School – Pittsburgh | Oliver Iron Mining Co. – Pittsburgh |
| Bethlehem City Water Co. – S. Bethlehem | Oliver Iron Steel Co. – Pittsburgh |
| Bethlehem Cornwall – Cornwall | Oliver Nace Greenhouse – Perkasie |
| Bethlehem Corp. Easton | Oliver Snyder Steel Co. – Oliver |
| Bethlehem Energy – Johnstown | Oliver Wire Co. Limited Pittsburgh |
| Bethlehem Fairfield Shipyard, Inc. – Bethlehem | Olmsted Air Force Base – Middletown |
| Bethlehem Foundry Machine Bethlehem | Olmsted Field |
| Bethlehem Ironworks – Bethlehem | Olney High School – Philadelphia |
| Bethlehem Jr. Sr. High School – Deemston Boro | Olsen Industries Inc. Carnegie |
| Bethlehem Lukens Plate Products Coatesville | Olson Engineering Co. Pittsburgh |
| Bethlehem Mine Plant Cornwall | Olyphant Colliery – Olyphant |
| Bethlehem Mine Plant Morgantown | Olyphant Power Plant – Olyphant |
| Bethlehem Mines Corp. – Ebenburg | Omaha & Council Bluffs Railway & Bridge Co. – Council Bluffs |
| Bethlehem Mines Corp. Ebensburg | Omg Americas – Johnstown |
| Bethlehem Mines Corp. Hanover Quarry Hanover | Onderdonk Heating & Ventilating Co. – Philadelphia |
| Bethlehem Plant – Bethlehem | Oneida Colliery – Oneida |
| Bethlehem Silk Co. – Bethlehem | Oneida Mining Co. Armagh – Bush Valley |
| Bethlehem Steel Co Pipe Shop Saucon Division – Bethlehem | Oneida Mining Homer City |
| Bethlehem Steel Co. – Allentown | Onex Inc. – Erie |
| Bethlehem Steel Co. # 1-4 Shop Warehouse Lehigh Division Bethlehem | Onoponca City Chester |
| Bethlehem Steel Co. Allentown | Open Hearth Division – Homer City |
| Bethlehem Steel Co. Ambridge | Open Hearth Plants – Johnstown |
| Bethlehem Steel Co. Boiler House #2 Bethlehem | Orient Coal & Coke Co. – New Salem |
| Bethlehem Steel Co. Brick Storage Stop 242 Johnstown | Orient Coal & Coke Co. Uniontown |
| Bethlehem Steel Co. Central Boilers End Yard Steelton | Orient Coke Co. – Orient |
| Bethlehem Steel Co. Coal Mines – Johnstown | Orinoka Mills – Philadelphia |
| Bethlehem Steel Co. Cornwall | Orion Power Holdings Inc. – New Castle |
| Bethlehem Steel Co. Dunaghmore | Orion Power Holdings Inc. Elrama |
| Bethlehem Steel Co. Easton | Orion Power Midwest, Llc Pittsburgh |
| Bethlehem Steel Co. Edensburg | Orion Power Midwest, Llc. – Elrama |
| Bethlehem Steel Co. End Yards Supply Department Steelton | Orr & Sembower Inc. – Reading |
| Bethlehem Steel Co. Franklin Works Johnstown | Orr & Sembower Inc. Middletown |
| Bethlehem Steel Co. Franklin | Orr Sembower Inc. Reading |
| Bethlehem Steel Co. Hanover | Orrtanna Canning Co. – Orrtanna |
| Bethlehem Steel Co. Hellertown | Osborn Machine Co. – Dubois |
| Bethlehem Steel Co. Homer Research Labs – Bethlehem | Oscar Meyer Meats – Philadelphia |
| Bethlehem Steel Co. Hussey Copper Plant – Leetsdale | Oswald & Hess Co. Inc. – Pittsburgh |
| Bethlehem Steel Co. Indianatown Gap | Otis Steel Co. – Pittsburgh |
| Bethlehem Steel Co. Joanna | Otto Milk Co. Pittsburgh |
| Bethlehem Steel Co. Johnstown | Our Lady of Mercy Academy – Monroeville |
| Bethlehem Steel Co. Lebanon | Our Lady Of Mercy School – Monroeville |
| Bethlehem Steel Co. Leetsdale | Our Lady Of Mt. Carmel Convent – Carbondale |
| Bethlehem Steel Co. Lehigh Pipe Shop – Bethlehem | Our Lady of Peace Church – Conway |
| Bethlehem Steel Co. Lehigh | Overbroock Steam Heat Co. – Philadelphia |
| Bethlehem Steel Co. Manessa | Overbrook Steam Heat Co. – Overbrook |
| Bethlehem Steel Co. Mines Johnstown | Overbrook Steam Heat Co. Uplant Way Philadelphia |
| Bethlehem Steel Co. Nbr 4 Shop Warehouse Bethlehem | Overhead Door Co. – Lewistown |
| Bethlehem Steel Co. Neville Island | Owen-Corning Fiberglass Corp. – Philadelphia |
| Bethlehem Steel Co. New Flange Structural Mill – Bethlehem | Owens Corning Fiberglas – Ephrata |
| Bethlehem Steel Co. Pipe Shop Lehigh Division – Bethlehem | Owens Corning Fiberglass – Berwick |
| Bethlehem Steel Co. Pipe Shop Lehigh Division Bethlehem | Owens Illinois – Bardstown |
| Bethlehem Steel Co. Pittsburgh | Owens Illinois Glass Co. – Clarion |
| Bethlehem Steel Co. Plant Ingot Mold Foundry Bethlehem | Owens-Corning Fiberglas Corp. Berwick |
| Bethlehem Steel Co. Redington Schrapnel Department 3 | Owens-Corning Fiberglas Corp. Berwyn |
| Bethlehem Steel Co. Research Center – PA | Owens-Corning Fiberglas Corp. Ephrata |
| Bethlehem Steel Co. Steel Mill Bethlehem | Owens-Corning Fiberglas Corp. Huntington |
| Bethlehem Steel Co. Steel Mill Johnstown | Owens-Corning Fiberglas Corp. Philadelphia |
| Bethlehem Steel Co. Steelton Central Boilers Dept | Owens-Corning Glass Co. Bardstown |
| Bethlehem Steel Co. Track 514 Truck Stop 173 Mech. Johnstown | Owens-Corning Glass Co. Brookville |
| Bethlehem Steel Co. Truck Stop 242 Johnstown | Owens-Corning Glass Co. Clarion |
| Bethlehem Steel Corp. Coatesville | Owens-Corning Glass Co. Claxton |
| Bethlehem Steel Corp. Ellsworth | Owens-Illinois – Brookville |
| Bethlehem Steel Corp. Johnstown | Owens-Illinois Container Division Clarion |
| Bethlehem Steel Corp. Lebanon | Owens-Illinois Fiberglass Co. Croydon |
| Bethlehem Steel Corp. Steel Mill Ellsworth | Owens-Illinois Fiberglass Co. Pittston |
| Bethlehem Steel Mill – Bethlehem | Owens-Illinois Glass Plant Clarion |
| Bethlehem Steel Research Center – Bethlehem | Oxford Cabinet Co. – Oxford |
| Bethlehem Steel Shipyard – Bethlehem | Oxford, Blawnox |
| Bettis Atomic Power Laboratory – Mifflin | Oxy- Loy Allentown |
| Betty Brackly, Lynsk – Philadelphia | Oxychem Berwyn |
| Betty Brackly-Lynsk – Philadelphia | Oxygen Plant – Creighton |
| Betz Labs – Trevose | Oxygen Plant – Natrona Hts |
| Beulah Church – Murrysville | Ozenda Smokeless Coal Co. – Bosewell |
| Beyer William & Kathleen – Drexal Hill | P & L. E. Railroad – Pittsburgh |
| BF Goodrich Co. Oaks | P & Le Railroad – McKees Rocks |
| Bicking Paper Mills – Downington | P G H Steamline – Philadelphia |
| Bickley Furnaces, Inc. – Philadelphia | P Le Railroad Beaver Falls |
| Biel’s Ashland Gas Station – Greenville | P P & L Office Building – Kingston |
| Big E Coal Mine – Twilight | P P G Industries Inc. Meadville |
| Big Run Milling Co. – Big Run | P P G Industries Inc. Springdale |
| Big Run Milling Co. Big Run, Jefferson County | P P L Office Building Kingston |
| Big Wheel – Waynesburg | P& Le Railroad McKees Rocks |
| Bilc Super Market – Philadelphia | P. A. Power & Light |
| Binder Cooperage – Philadelphia | P. A. Power & Light – Sunbury Station – Sunbury |
| Bindley Hardware Co. Pittsburgh | P. A. S. Small York |
| Bingham House – Philadelphia | P. C. C. St. L. Railway Co. – Pittsburgh |
| Binney & Smith, Inc. – Easton | P. D. M. – Clairton |
| Bird Coal Co. – Tire Hill | P. F. Magin & Co. – Pittsburgh |
| Bird Coleman Furnaces – Cornwall | P. F. Magin & Co. Jones & Laughlin Bldg Pittsburgh |
| Birdsboro Corp. – Birdsboro | P. G. H. Steamline Ship Co. |
| Birmingham School – Bingham | P. H. Berman & Sons – Philadelphia |
| Bishop Tube Co. – Frazer | P. H. Berman Sons Philadelphia |
| Bissell & Co. – Pittsburgh | P. H. Gladfelter Co. Spring Grove York |
| Bituminous Coal – Monroeville | P. H. Glatfelter Co. Gladfelter Bldg Spring Grove |
| Black & Germer – Erie | P. I. C. C. O. Chemical – Elizabeth |
| Black Burn Russell Co. – Bedford | P. J. Ritter Co. – Philadelphia |
| Black Liquer Oxidation System – Spring Grove | P. L. McKees Rocks |
| Black River Chester | P. McGraw & Wool Co. Allegheny |
| Blackwood Colliery – Blackwood | P. McGraw Wool Co. Pittsburgh |
| Blackwood Colliery Orwigsburg | P. P. & L. – Turbine |
| Blair Fuel Co. Robindale | P. P.& L. – Turbine – Lower Mount Bethel |
| Blakeley – Philadelphia | P. P.G. Industries – Pittsburgh |
| Blakely Borough Municipal Electric Plant – Blakely | PA Department of Revenue – Pittsburgh |
| Blast Furnace Dept. Swedeland Conshohocken | PA Forge Div of Chertron Corp – Philadelphia |
| Blast Furnace Division Chester | PA Institute for The Instruction of The Blind – Philadelphia |
| Blatts Chemical Laboratory – Feasterville | PA Mall Iron Corp. Lancaster |
| Blaw Knox Co. Pittsburgh | PA Railroad Station – 12Th Penn |
| Blaw-Knox – Butler | PA Soldiers & Sailors Home – Erie |
| Blaw-Knox Chemical – South Bend | PA State Highway Department – Harrisburg |
| Blaw-Knox Co. – Blawknox | PA Transformers Canonsburg |
| Blaw-Knox Co. Butler | PA Liquor Control Board – Youngwood |
| Blaw-Knox Co. Coraopolis | Pabst Brewing Co. – Fogelsville |
| Blaw-Knox Co. Ellwood City | Pacific Railroad Western Lines – Conway |
| Blaw-Knox Co. Pittsburgh | Packard Building – Philadelphia |
| Blawnox Mill – Blawknox | Packer Colliery #4 #5 Lost Creek |
| Blind Floral Co. Pittsburgh | Pacor – Chester |
| Bliss Silk Throwing Co. Jessup Plant Dickson City | Pacor Inc. – Philadelphia |
| Blooming Mill – Johnstown | Page Steel Wire Co. Monessen |
| Blooming Mill Johnstown | Page Woven Wire Fence Co. – Monesson |
| Bloomsburg Heating Co. – Bloomsburg | Paintertown School Paintertown |
| Bloomsburg Mills – Bloomsburg | Pakistan Industrial Development Corp. Daud Khel |
| Blossburg Coal Mining & Railroad Co. – Arnot | Pala, LLC, & – Pala, Inc. |
| Blossom Products Corp. – Allentown | Palladinon Pottstown |
| Blue Bell, Inc. Reading | Palmerton Elementary – Palmerton |
| Blue Flame Burners Inc. Pittsburgh | Palmerton Zinc -Bethlehem |
| Blue Ridge Traction Co. – Danielsville | Palmerweld Fabricating Co. – Ambler |
| Blue Ridge Winkler Textile Co. – Bangor | Palumbo Chevrolet – Clairton |
| Bluffs Railway & Bridge Co. Council Bluffs | Pangborn Corp. – Bethlehem |
| Blumenthal Bros Choc Co. Philadelphia | Paoli Elementary Paoli |
| Blumenthal Brothers – Philadelphia | Paoli Elementary School – Paoli |
| Blumenthal Brothers Choco. Philadelphia | Paper Manufacturers – Philadelphia |
| Board Of Education – Mechanicsburg | Paper Manufacturing Co. – Philadelphia |
| Board Of Education Buildings – Philadelphia | Paper Mill Lock Haven |
| Bob Miller Real Estate – Meadville | Papercraft Plant – Pittsburgh |
| Bodwell Co. – Harrisburg | Parade Lumber Co. – Erie |
| Boehm Manufacturing Co. – Connellsville | Paragon Packaging Product Inc. – Girard Point |
| Boehm Manufacturing Co. – Conshohocken | Paris Construction – Atlasburg |
| Boeing Aircraft Plant – Reading | Parish Div. Dana Reading |
| Boeing Co. Eddystone | Parish House – Carnegie |
| Boeing Co. Ridley Park | Parish Pressed Steel Co. Birdsboro |
| Boeing Helicopter Plant – Morton | Parish Pressed Steel Co. Bucks |
| Boeing Vertol – Eddystone | Parish Pressed Steel Co. Reading |
| Boeing Vertol Co. Philadelphia | Park – Bridgeville |
| Boeing Vertol Morton | Park & Tilford Distillery Co. – Brownsville |
| Boeing Vertol Ridley Park | Park City Mall Lancaster |
| Boeing Vertol Ridley Township | Park City Shopping Center – Park City |
| Boericke & Tafel Building – Philadelphia | Park City Shops – Route 30 Bypass – Lancaster |
| Boger & Crawford – Philadelphia | Park City Stores – Park City |
| Boggs Buhl, Diamond St. & Alley Allegheny City | Park Hill Mall – Altoona |
| Boiler Engineer Supply Co. Phoenixville | Park Hospital – Philadelphia |
| Boiler Erection Repair Ambler | Park Hotel – Wiliamsport |
| Boiler Service, Inc. – Spring House | Park Shops – Mantua |
| Boiler Tube Co. of America – McKees Rocks | Park Steel Co. – Pittsburgh |
| Boivaird & Seyfang Fab Shop – Bradford | Park Steel Works – Pittsburgh |
| Bok Technical High School – Philadelphia | Park Works – Pittsburgh |
| Bollinger Andrews Construction Co. – Fayette | Parkersburg Iron & Steel Co. – Pittsburgh |
| Bollinger Brothers – Pittsburgh | Parkesburg Iron Co. – Parkesburg |
| Bon Secours Holy Family Hospital – Altoona | Parkview Court Apartments |
| Bonair Foundry Co. – Philadelphia | Parkway Apartments – Harrisburg |
| Bonded Products – Chester | Parkway Center Mall Greentree |
| Bonney Forge & Tool Works – Allentown | Parkway Manor Elementary School – Lehigh County |
| Bonney Forge Tool Works Allentown | Parsons Insulation Wilkes Barre |
| Bonney Frg Division – Allentown | Pasadena School District – Pasadena |
| Bonney Tool & Forge Works – Allentown | Pascagoula Street Railway & Power Co. – Scranton |
| Booster Boiler House Saucon Plant – S. Bethlehem | Passavant Home – Rochester |
| Borg Warner Corp. – York | Passavant Hospital – Pittsburgh |
| Bornet Cleaners – Philadelphia | Pat & Reds Tire |
| Bornot, Inc. – Philadelphia | Pat & Reds Tire Waymart |
| Borough Of Blawnox – Blawknox | Paterson Parchment Paper Co. – Bristol |
| Borough of Grove City – Sewage Plant Grove City | Paterson Parchment Paper Co. Edgley |
| Borough Of Phoenixville – Phoenixville | Pathfinder School – Bethel Park |
| Borough Of Quakertown – Quakertown | Patterson Equipment Co. – Carnegie |
| Borough Of Schuylkill Haven – Schuylkill Haven | Patterson- Kelly Corp. – Stroudsburg |
| Borough Of Tarentum – Tarentum | Paul & Beekman Co. Philadelphia |
| Borzillo Bakery Inc. Morristown | Paul B. Hendel & Co. – Reading |
| Boston & Ohio Railroad – Philadelphia | Paul Bronze & Brass Corp. – Eddington |
| Boston & Ohio Railroad Co. – Connellsville | Paul E. Berry-Excavating Contractor Richland |
| Boston Brick Co. Boston | Paul E. Stare Plumbing Heating Mechanicsburg |
| Boston Colliery – Kingston | Paul Lumber & Supply Co. – Pittsburgh |
| Boston Colliery Kingston | Paul Thompson Sand & Gravel – Mercer |
| Boston Iron & Steel Co. – McKeesport | Paul W. Anderson – Stroudsburg |
| Boston Ohio Railroad Co. Connellsville | Paulson Abbot Inc. Croydon |
| Boston Ohio Railroad Co. Glenwood | Pawcatuck – Chester |
| Boston Ohio Railroad Co. New Castle | Pawhattan Coal & Coke Co. – Sykesville |
| Boston Ohio Railroad Co. Philadelphia | Paxtang Electric Co. – Harrisburg |
| Boston Ohio Railroad Co. Pittsburgh | Paxton Iron & Steel Co. – Harrisburg |
| Botany 500 – Philadelphia | Paxtron Furnaces – Harrisburg |
| Botfield Refractories Co. – Philadelphia | Pbs Coal Co. – Central City |
| Bovaird Co. Bradford | Pc& Y Railroad – McKees Rocks |
| Bowling Alley – Altoona | Peabody Vertical Air Heater – Newell |
| Bowman Trucking – Indiana | Peach Bottom Atomic Power Station – Erie |
| Boyce Park – Freeport | Peach Bottom Atomic Power Station Unit 2 & 3 Delta |
| Boyertown Burial Casket Co. Boyertown | Peach Bottom Nuclear Plant – Peach Bottom |
| Bp Oil Co. – Trainer | Peach Bottom Nuclear Plant York County |
| Bp Oil Corp. Marcus Hook | Peach Bottom Nuclear Power – Peach Bottom |
| Bp Oil Corp. Philadelphia | Peachbottom Nuclear Plant Unit 2 Delta |
| Bp Oil Philadelphia | Peachbottom Powerhouse – Philadelphia |
| BP Oil Sinclair Refinery Trainer | Peachbottom Powerhouse Delta |
| Bp Oil Trainer | Pearson Manufacturing Co. Inc – Pittsburgh |
| BP Refinery Chester | Pebbco. Industries Lancaster |
| Bpeco Energy Co. – Philadelphia | Peccora Inc. Philadelphia |
| Bra- Vor Inc. – Meadville | Peckerman Co. – Philadelphia |
| Brace Compressor Station – Braceton | Peco – Eddystone Station Power Plant – Eddystone |
| Brackenridge Works Soaking Pit – Brakenridge | Peco Barbados Island Powerhouse – Norristown |
| Braddock & Turtle Creek Electric Railway – Braddock | Peco Cromby Station – Phoenixville |
| Braddock General Hospital – Braddock | Peco Croydon Powerhouse – Croyden |
| Braddock Hospital – Pittsburgh | Peco Delaware Station Powerhouse – Philadelphia |
| Braddock Hospital – Warehouse – Pittsburgh | Peco Eddystone Station Powerhouse – Eddystone |
| Braddock Wire Co. – Pittsburgh | Peco Energy Co. – Philadelphia |
| Braddock Wire Co. Rankin | Peco Energy Conshohocken Gas Plant Conshohoken |
| Bradford Hospital – Bradford | Peco. Cromby Power Plant Phoenixville |
| Bradford Mall – Bradford | Peco-Barbados Island Powerhouse – Norristown |
| Bradford Oil Refining – Bradford | Peco-Cromby Station – Norristown |
| Bradford Supply Co. – Bradford | Peco-Philadelphia Electric Philadelphia |
| Bradford Supply Co. Lawton Lease | Peerless Dye Co. – Philadelphia |
| Bradlee & Co. – Philadelphia | Penacol Plant Chemical Division Petrolia |
| Bradlee Co. Philadelphia | Pencoyd Ironworks – Pencoyd |
| Bradshaw & Co. – Pittsburgh | Pencoyd Ironworks Philadelphia |
| Braeburn Alloy – Lower Burrell | Penelec Power Plant – Shawville |
| Braeburn Alloy Braeburn | Penhurst State Institute |
| Braeburn Alloy Steel – Lower Burrell | Penhurst State Institute – Spring City |
| Braeburn Alloy Steel Corp. Braeburn | Penn- Allen Cement Co. Nazareth |
| Braeburn Steel Co. Braeburn | Penn- Allen Portland Cement Co. Allentown |
| Braeburn Steel Co. New Kensington | Penn- Allen Portland Cement Co. Bath |
| Braeburn Steel New Kensington | Penn Aluminum – Erie |
| Brand Insulation – Philadelphia | Penn Aluminum Murphysboro, IL |
| Brand Mid Atlantic Inc. Philadelphia | Penn Argyl High School – Pen Argyl |
| Brandley Smith – Philadelphia | Penn Bank – Franklin |
| Brandywine Mushroom Co. – Chester | Penn Boiler & Construction |
| Breading Paperboard Corp. – Sinking Springs | Penn- Bradford Appl. Philadelphia |
| Breading Paperboard Corp. Sinking Spring | Penn Bradford Co. – Philadelphia |
| Breaker Boiler House – Glen Lyon | Penn Center – Latrobe |
| Breckinridge – Philadelphia | Penn Center Building – Philadelphia |
| Bregy Elementary School – Philadelphia | Penn Center Two Philadelphia |
| Bremans Express Pittsburgh Terminal Pittsburgh | Penn Central Altoona |
| Brent Builders – Verona | Penn Central Enola |
| Bressler Metal Works Lebanon | Penn Central Holidaysburg |
| Bricklayer’s Union Local 1 – Philadelphia | Penn Central Light & Power Co. Altoona |
| Bricmont & Associates – MacMurray | Penn Central Light & Power Co. Saxton |
| Bricmont & Associates | Penn Central Railroad – Altoona |
| Bridge Shop – Pencoyd | Penn Central Railroad Philadelphia |
| Bridgeville Bottling Co. – Bridgeville | Penn Central South Altoona |
| Bridgeville Plant | Penn Dairies – Lancaster |
| Bridgeville Sales – Bridgeville | Penn Dairies Pottsville |
| Bridgewater Paper Co. – Bridgewater | Penn Dairies, Inc. – York |
| Brier Hill Coke Co. Brier Hill | Penn Dixie Cement Corp. Nazareth |
| Brier Hill Coke Co. Union City | Penn Dixie Cement Corp. Plant # 9 Winfield |
| Brier Hill Coke Co. Uniontown | Penn Electric – Warren |
| Briggs Co. – Somerset | Penn Electric Co. Shawville |
| Brinton Brothers New Cumberland | Penn Electric Johnstown |
| Bristol Steel Mill – Bristol | Penn- Electric Powerhouse – Erie |
| Bristol Steel Treating Co. Bristol | Penn Electric Warren |
| Bristol Water Works – Bristol | Penn Fishing – Philadelphia |
| British Petroleum Co. Marcus Hook | Penn Fruit Co. – Philadelphia |
| British Petroleum Co. Trainer | Penn Gas Coal Co. Irvin |
| British Petroleum Oil Sinclair Refinery Trainer | Penn Hardware Co. – Reading |
| British Petroleum Refinery Marcus Hook | Penn Heat & Power Co. Wilkinsburg |
| British Petroleum Refinery Trainer | Penn High School – Kingston |
| Broad Ford | Penn Hills High School – Penn Hills |
| Broad Meadows Farm Delaware County Prison – Delaware City | Penn Hospital – Pittsburgh |
| Broad Meadows Farm Prison Delaware County | Penn Iron – Creighton |
| Broad Mountain Manor Nursing Home – Frackville | Penn Iron Creighton |
| Broad St. Station – Philadelphia | Penn Jersey Boiler & Construction Inc. |
| Broad Street Station – Philadelphia | Penn Jersey Boiler Co. – Pennsauken |
| Broad Top Power Co. – Saxton | Penn Jersey Transmission Corp. Bechtelsville |
| Broad Top Railroad & Coal Co. – Orbisonia | Penn Jersey Transmission Corp. Boyertown |
| Brobst Aluminum Ephrata | Penn Jersey Transmission Corp. Grantville |
| Brockway Glass – Clarion | Penn Jersey Transmission Corp. Lilly |
| Brockway Glass Co. Brockway | Penn Jersey Transmission Corp. Perulack |
| Brockway Glass Co. Clarion | Penn Machine Co. – Johnstown |
| Brockway Glass Co. Inc. – Washington | Penn Mall Iron – Landisville |
| Brockway Pressed Metals – Brockway | Penn Manor School District – Lancaster |
| Bromley Lace Mill – Philadelphia | Penn Manufacturer Brackenridge |
| Brooks Brothers – Philadelphia | Penn Manufacturing Light Ht. & Power Co. – Philadelphia |
| Brookville Hospital – Brookville | Penn Middle School – Greenville |
| Brookwood Coal Co. – Frackville | Penn Mo Fire Brick Co. – Harrisburg |
| Brookwood Colliery Frackville | Penn Mo Firebrick Co. – Pittsburgh |
| Brothers Valley Coal Co. – Brothers Valley Township | Penn Optical – Reading |
| Broudy Precision Equipment Philadelphia | Penn Power Co. Armstrong Power Station Kittanning |
| Brown & Co. Inc – Pittsburgh | Penn Power Co. Armstrong Station, Unit #2 Rosedale |
| Brown & Co. Inc. – Pittsburgh | Penn Power Co. Courtney |
| Brown Brothers & Co. – Philadelphia | Penn Power Co. Greensburg |
| Brown Instrument Co. – Philadelphia | Penn Power Co. Homer City |
| Browning, King & Co. Building – Philadelphia | Penn Power Co. Milesburg |
| Browning, King, & Co. B’Lding – Philadelphia | Penn Power Co. Mitchell Power Station Monongahela |
| Browns Instrument Division Philadelphia | Penn Power Co. Mitchell Power Station Unit No 3 Courtney |
| Brownstown Vo-Tech Building – Brownstown | Penn Power Co. Mitchell Station Unit 3 Courtney |
| Brownsville General Hospital – Brownsville | Penn Power Co. New Castle |
| Brownsville Golden AGE Nu Brownsville | Penn Power Co. New Eagle |
| Bruce Industrial Controls Horsham | Penn Power Co. Pittsburgh |
| Bruce Mansfield Power Plant – Sharon | Penn Power Co. Power Station Unit #8 Springdale |
| Bruce Mansfield Power Station – Shippensburg | Penn Power Co. R. W. Bigley Power Station Springdale |
| Brunner Island Plant Unit #2-3 York Haven | Penn Power Co. Reesedale |
| Brunner Island Power Plant Westinghouse – York Haven | Penn Power Co. Ridgway |
| Brunner Island Power Station -York Haven | Penn Power Co. Williamsburg |
| Brunner Island Station Unit 2, 3 York Haven | Penn Power Light Montour Station Washingtonville |
| Brunot Island Generating Station Corliss, Alleghany County | Penn Power Office – Greensburg |
| Brunot Island Generating Station Storeroom Pittsburgh | Penn Powerhouse – Milesburgh |
| Brunots Island – Pittsburgh | Penn Public Service Corp. Johnstown |
| Brunot’s Island Powerhouse – Pittsburgh | Penn Public Service Corp. Philipsburg |
| Brunswick Asbestos Co. Inc. – Philadelphia | Penn Public Service Corp. Seward |
| Brunswick Fabricators – Philadelphia | Penn Range Co. – Philadelphia |
| Brush Electric Light Co. – Philadelphia | Penn Refractories Co. – Reading |
| Bryant School – Philadelphia | Penn Republic Service Corp. – Seward |
| Bryce Brothers Glass Factory – MT. Pleasant | Penn Rilton Co. Elizabeth |
| Bryden America Plant – Hanover Industrial Park – Hanover | Penn Sheraton Hotel – Philadelphia |
| Bryden Horseshoe Co. – Catasauqua | Penn Shovel Co. Corry |
| Bryn Mawr Hospital – Bryn Mawr | Penn State College – Altoona |
| Bryton Chemical Co. – Trainer | Penn State College – Dormitory – Star Junction |
| Bryton Chemical Co. Chester | Penn State Educational Association Building – Harrisburg |
| Buchanan Lumber Co. – Altoona | Penn State Nuclear Plant – Penn State |
| Buck County Electric Railway Co. – Newtown | Penn State University – Altoona |
| Buck Hill Falls Inn – Buck Hill Falls | Penn State University – Hub Building |
| Buck Iron Co. Inc. Quarryville | Penn State University – Johnstown |
| Buck Mount Colliery #3 – Mahanoy City | Penn State University – McKeesport |
| Buck Run Coal Co. – Minersville | Penn State University – New Kensington |
| Buck Run Coal Co. Rohnerville | Penn State University – State College |
| Buckhorn Portland Cement Co. – Philadelphia | Penn State University – University Park |
| Bucknell University – Kingston | Penn Steel Co. Philadelphia |
| Bucks County Community College – Newtown | Penn Steel Co. Steelton |
| Bucks Run Station Pittsburgh | Penn Tech Paper Mill – Johnsonburg |
| Bucyrus Erie – Erie | Penn Township Junior High School – Pittsburgh |
| Bucyrus- Erie Co. Glassport | Penn Traffic Store Somerset |
| Bud Gourmet – Robinson Township | Penn Treaty American Corp. – Philadelphia |
| Budd Co. Bridgeport | Penn Treaty Overall – Philadelphia |
| Budd Co. Connellsville | Penn Ventilator Co. Philadelphia |
| Budd Co. Conshohocken | Penn Water Co. Ethel Park |
| Budd Co. Philadelphia | Penn. Allen Port Cement Co. – Allentown |
| Budd Co. Polychem Division Bridgeport | Penn. Steel Co. – Philadelphia |
| Budd Co. Red Lion | Penna Gen’L Imp. Co. – Philadelphia |
| Budd Red Line Co. Philadelphia | Penna Hospital – Philadelphia |
| Buffalo & Pittsburgh Railroad Butler | Penna Lines of Pittsburgh |
| Buffalo & Susquehanna Coal & Coke Co. – Big Run | Penna Railroad Co. – Philadelphia |
| Buffalo Hardware Stove Co. – Freemans Run | Penna Railroad Lines of Pittsburgh |
| Buffalo Pittsburgh Railroad Butler | Penna Tri-State Home Improvement Co. Lawn |
| Buffalo Susquehanna Coal Coke Co. Big Run | Penna Tunnel & Terminal Railroad Co. |
| Buffalo Susquehanna Coal Coke Co. Dubois | Penna, New York & Long Island RR Co. |
| Buffalo Susquehanna Coal Coke Co. North Juneau | Penna. Manufacturing Light & Power Co. – Philadelphia |
| Buffalo Susquehanna Coal Coke Co. Sagamore | Penna. State Hospital – Philadelphia |
| Buhl Club – Sharon | Penn-Allen Cement Co. – Nazareth |
| Buhl Steel Co. – Sharon | Penn-Allen Portland Cement Co – Bath |
| Buick Garage – Meadville | Penn-Allen Portland Cement Co. – Allentown |
| Buick Manufacturing Division – Philadelphia | Penn-Bradford Appl. – Philadelphia |
| Buick Motor Division – Philadelphia | Pennco Industries Warren |
| Builders Supply Co. Wilkes Barre | Penn-Dixie Cement Co. |
| Building 52, Norristown State Hospital Norristown | Pennfuels Clymer |
| Buler Colliery – Pittston | Pennhurst St School Spring City |
| Bulletin Building – Philadelphia | Pennhurst State School |
| Bundy Tubing – Coaldale | Pennhurst State School – Spring City |
| Bundy Tubing Co. – Hometown | Pennhurst State School Spring City |
| Bundy Tubing Coaldale | Pennrico. – Karn City |
| Buono Bakery – Chester | Penns Park – Bucks County |
| Bureau of Mines – Dept. of Interior Bruceton | Penns Valley Insulation Co. Lester |
| Bureau Of Mines Building – Pittsburgh | Pennsalt Chemical Co. King of Prussia |
| Bureau of Mines Dept. of Interior Bruceton | Pennsalt Chemical Co. Philadelphia |
| Bureau of Mines South Park | Pennsalt Chemical Co. Wyndmoor Philadelphia |
| Bureau Of Mines, Experimental Station – Pittsburgh | Pennsalt Chemicals Corp. – Kimberton |
| Bureau Of Water Department Of Parks & Public Property – Reading | Pennsboro Mfg. Economy Industries |
| Bures Motor Sales – Freeport | Pennsbury Pottery Co. Harrisville |
| Burger King – Phillipsburg | Pennsbury Pottery Co. Morrisville |
| Burke rsons & Bowlby – Dubois | PennsValley High School – Spring Mills |
| Burkey Mills, Inc. Hamburg | Pennsylavania Coal Co. Pittston |
| Burle Industries, Inc. – Lancaster | Pennsylvaina Electric – Johnstown |
| Burnham Boiler Co. Lancaster | Pennsylvania – Dept. of Public Instruction |
| Burrell Construction – New Kensington | Pennsylvania Academy of The Fine Arts – Philadelphia |
| Burroughs Corp. – Paoli | Pennsylvania Bolt & Nut Co. – Lebanon |
| Bustleton Elementary – Philadelphia | Pennsylvania Brake Beam Co. – Danville |
| Busx Corp – Pittsburgh | Pennsylvania Cement Co. – Bath |
| Butler & New Castle Railway Co. | Pennsylvania Central Power Transit Williamsburg |
| Butler Auto Auction – Butler | Pennsylvania Central Railroad – Philadelphia |
| Butler Bridge – Butler | Pennsylvania Central Railroad, 30th St. Station Philadelphia |
| Butler Colliery Pittston | Pennsylvania Chocolate Co. – Pittsburgh |
| Butler County Memorial Hospital – Butler | Pennsylvania Co. Conway |
| Butler County Mushroom Farm – Butler | Pennsylvania Co. Lines of Pittsburgh Allegheny |
| Butler Disposal Plant – Butler | Pennsylvania Co. Pittsburgh |
| Butler Health System – Butler | Pennsylvania Coal & Coke Co. – Ehrenfeld |
| Butler High School – Butler | Pennsylvania Coal Co. #8 Washery Pittston |
| Butler Library – Butler | Pennsylvania Coal Co. Avoca |
| Butler Light, Heat & Motor Co. – Butler | Pennsylvania Coal Co. Dunamere |
| Butler Light, Heat & Power Co. – Butler | Pennsylvania Coal Co. Dunmore |
| Butler Manufacturer – Providence | Pennsylvania Coal Co. Dunnon |
| Butler Memorial Hospital – Butler | Pennsylvania Coal Co. Ewen Breaker Pittston |
| Butler Sewage Plant – Butler | Pennsylvania Coal Co. Mt. Lookout |
| Butler State Memorial Hospital – Butler | Pennsylvania Coal Co. Old Forge Breaker Dunmore |
| Butler Street Factory – Butler | Pennsylvania Coal Co. Pittston |
| Butler Township – Butler | Pennsylvania Coal Co. Plains Junction |
| Butler Works – Butler | Pennsylvania Coal Co. Scranton |
| Byberry Farms – Somerton | Pennsylvania Coal Co. Sebastopol |
| Byberry State Mental Hospital – Philadelphia | Pennsylvania Coal Co. Wyoming |
| C & C Auto Parks – Cochranville | Pennsylvania Cola Co. Dunmore |
| C & D Battery – Connellsville | Pennsylvania Conrail Railroad Locomotive |
| C. A. Spalding – Philadelphia | Pennsylvania Department of Public Indiana |
| C. B. Comstock Pittsburgh | Pennsylvania Electric Co. – Pine Grove |
| C. C. & E. P. Townsend Co. New Brighton | Pennsylvania Electric Co. Altoona |
| C. C. & E.P. Townsend Co. – Fallston | Pennsylvania Electric Co. Chester |
| C. C. Harrison Building – Philadelphia | Pennsylvania Electric Co. Conemaugh New Florence |
| C. C. Knight & Co. Building – Philadelphia | Pennsylvania Electric Co. Erie Plant Erie |
| C. D Battery Pennsburg | Pennsylvania Electric Co. Front St. Power Station Erie |
| C. E. Monday & Co. – Philadelphia | Pennsylvania Electric Co. Homer City Generating Station Homer City |
| C. F Refractories Port Kennedy | Pennsylvania Electric Co. Johnstown |
| C. F. Luppold – Leesport | Pennsylvania Electric Co. Keystone Generating Station |
| C. F. Simonins & Sons – Philadelphia | Pennsylvania Electric Co. Power Plant |
| C. G. Hussey & Co. – Leetsdale | Pennsylvania Electric Co. Seward Generating Station Seward |
| C. H. Bradley & Co. – Pittsburgh | Pennsylvania Electric Co. Seward Plant – Indiana |
| C. H. Co. Rowland | Pennsylvania Electric Co. Seward Plant Indiana County |
| C. H. Geist Co. – Philadelphia | Pennsylvania Electric Co. Seward Station Seward |
| C. H. Masland & Sons Carlisle | Pennsylvania Electric Co. Shawville Generating Station Units 3 4 Shawville |
| C. H. Maslin & Sons – Philadelphia | Pennsylvania Electric Co. Steam Heat Dept Front St Station Erie |
| C. H. Musselman Co. – Biglerville | Pennsylvania Electric Co. Williamsburg |
| C. H. Rowland – Philipsburg | Pennsylvania Electric Keystone Generating Station Plumcreek |
| C. H. Wheller Manufacturing. Co. – Philadelphia | Pennsylvania Electric New Florence |
| C. Howard Mercy State Hospital – Pittsburgh | Pennsylvania Electric Saxton |
| C. L. Miller Co. – Scottsdale | Pennsylvania Electric Steel Co. – Latrobe |
| C. M. Marks Inc. Coraopolis | Pennsylvania Forge Corp. – Tacony |
| C. R. Bairch & Co. – Emporium | Pennsylvania Fruit – Philadelphia |
| C. Schmidt & Sons Brewing Co. – Philadelphia | Pennsylvania Furnace Co. – Sheridan |
| C. V. Comstock | Pennsylvania Gas & Water Co. – Wilkes Barre |
| C. V. Comstock – Pittsburgh | Pennsylvania Gas Co. – Erie |
| Cabot Corp. South Boyertown | Pennsylvania Gas Co. Roystone |
| Calabro Tires – Bridgeville | Pennsylvania Gas Coal Co. – Irwin |
| Caledonian Dye Works | Pennsylvania Gas Water Co. |
| Caledonian Dye Works – Philadelphia | Pennsylvania General Electric Co. – Pittsburgh |
| Calgon – Ellwood City | Pennsylvania General Imp. Co. – Philadelphia |
| Calgon – Robinson Township | Pennsylvania General Imp. Co. Rockledge |
| California University of Pennsylvania – California | Pennsylvania Glass-Sand Corp. |
| Callery Chemical Co. – Callery | Pennsylvania Hardware Co. Reading |
| Calls Plaza Grocery Store – New Castle | Pennsylvania Hospital – Philadelphia |
| Caloric Appliance Corp. – Topton | Pennsylvania Hospital – Pittsburgh |
| Caloric Corp. Topton | Pennsylvania Industrial Chemical Co. Chester Plant Chester |
| Calumet Lubricants Co. – Rouseville | Pennsylvania Industrial Chemical Co. Clairton Plant Storeroom Clairton |
| Cambria Apa 36 – Philadelphia | Pennsylvania Industrial Chemical Co. Gate 1 Chester |
| Cambria County Home – Johnstown | Pennsylvania Industrial Chemical Co. Jefferson Plant Elizabeth |
| Cambria Indiana Railroad – Colver | Pennsylvania Industrial Chemical Corp. Picco. – Clairton |
| Cambria Indiana Railroad – Johnstown | Pennsylvania Institute for Instruction of Blind – Overbrook |
| Cambria Iron Co. – Johnstown | Pennsylvania Institute for The Instruction Of The Blind – Philadelphia |
| Cambria Leasing Corp. – Johnstown | Pennsylvania Iron Co. – Lancaster |
| Cambria Library Association – Johnstown | Pennsylvania Lake Erie Dock Co. |
| Cambria Plant – Johnstown | Pennsylvania Laurelton State Village Laurelton |
| Cambria Steel Co. – Johnstown | Pennsylvania Light & Power Co. Allegheny |
| Cambria Steel Co. Marianna | Pennsylvania Light, Heat & Power Co. Allegheny |
| Cambria Steel Co. Office Building Johnstown | Pennsylvania Lightweight Aggregate – Bangor |
| Cambria Steel Co. Philadelphia | Pennsylvania Lightweight Aggregate Bangor |
| Camden Copper Works – Philadelphia | Pennsylvania Lines, of Pittsburgh |
| Camden Fibre Mills – Philadelphia | Pennsylvania Lubricating Co. – Pittsburgh |
| Cameron Colliery – Shamokin | Pennsylvania Mahoning Valley Railway Co. |
| Cametoo Co. – Pittsburgh | Pennsylvania Malleable Co. – McKees Rocks |
| Campbell Soup Co. – Philadelphia | Pennsylvania Malleable Co. Pittsburgh |
| Campbell Soup Co. Fourth Floor Rear Philadelphia | Pennsylvania Manufacturing Light & Power Co. Philadelphia |
| Can Do Industries Park – Hazleton | Pennsylvania Mutual Building – Philadelphia |
| Can- Tex Industries, Inc. Frugality | Pennsylvania Mutual Insurance Co. – Philadelphia |
| Canadian Westinghouse Ltd – Waltz Mills – Ruffs Dale | Pennsylvania Ordnance – Allenwood |
| Canning Factory – Somerset | Pennsylvania Ordnance Works – Allentown |
| Cannon Boiler Works, Inc. – New Kensington | Pennsylvania Ordnance Works Ordnance Works Allentown |
| Cannonsburg Iron & Steel Co. – Pittsburgh | Pennsylvania Penitentiary Dept. of Justice Prison Site Graterford |
| Cannonsburg Iron & Steel Co. Canonsburg | Pennsylvania Perlite Corp. Manufacturing Plant Bethlehem |
| Canonsberg Iron & Steel Co. – Pittsburgh | Pennsylvania Pilot Plant Lock Haven |
| Canonsburg General Hospital – Canonsburg | Pennsylvania Piping – Pittsburgh |
| Canonsburg Iron & Steel Co. – Canonsburg | Pennsylvania Power & Light Co. Allentown |
| Canonsburg Terrace Apartments – Canonsburg | Pennsylvania Power & Light Co. Bruce Mansfield Plant Shippingport |
| Can-Tex Industries, Inc. – Frugality | Pennsylvania Power & Light Co. Brunner Island Plant Unit #2-3 York Haven |
| Cantile Building Allegheny City | Pennsylvania Power & Light Co. Cedar Steam Electric Station – Harrisburg |
| Capital Products – Harrisburg | Pennsylvania Power & Light Co. Generation Stores Lancaster |
| Capital Products Co. Harrisburg | Pennsylvania Power & Light Co. Hauto Steam Electric Station |
| Capitol Products Co. – Mechanicsburg | Pennsylvania Power & Light Co. Holtwood |
| Car Mar Welding Service Berwick | Pennsylvania Power & Light Co. Lancaster County |
| Carain Co. – Somerset | Pennsylvania Power & Light Co. Lancaster |
| Carbide Graphite Group, Inc. – Saint Marys | Pennsylvania Power & Light Co. Martins Creek |
| Carbon Co. St. Mary S | Pennsylvania Power & Light Co. Montour Station Unit #1-2 Washingtonville |
| Carbon Limestone – Hillsville | Pennsylvania Power & Light Co. Montour |
| Carbon Malleable Co. – Lancaster | Pennsylvania Power & Light Co. Pine Grove |
| Carbon Steel Co. – Pittsburgh | Pennsylvania Power & Light Co. Power Plant Storeroom Shamokin Dam |
| Carbon Transit Co. – Mauch Chunk | Pennsylvania Power & Light Co. Power Plant Storeroom Snyder City |
| Carbondale High School – Carbondale | Pennsylvania Power & Light Co. River Station |
| Carbondale Machine Co. – Carbondale | Pennsylvania Power & Light Co. Scranton |
| Carborundum Co. Latrobe | Pennsylvania Power & Light Co. Service Depot Lancaster |
| Carey Brothers Wall Paper Manufacturing Co. – Philadelphia | Pennsylvania Power & Light Co. Ses Station Martins Creek |
| Carey Furnace – Rankin | Pennsylvania Power & Light Co. Shamokin Dam |
| Carey Manufacturing – Plymouth Meeting | Pennsylvania Power & Light Co. Strawberry Ridge |
| Carilise Tire & Rubber Co. – Carlisle | Pennsylvania Power & Light Co. Suburban Plant Storeroom Scranton |
| Carl P. Sheaffer Plumbing Mechanicsburg | Pennsylvania Power & Light Co. Sunbury Steam Station |
| Carlin William Steam Boilers – Jeannette | Pennsylvania Power & Light Co. Sunbury |
| Carlisle Gas & Water Co. – Carlisle | Pennsylvania Power & Light Co. Turbine Harrisburg |
| Carlisle Hotel Pressed Wheel Co. Middleton Township | Pennsylvania Power & Light Co. Turbine Pittsburgh |
| Carlson Manufacturing Co. – Carnegie | Pennsylvania Power & Light Co. Washingtonville |
| Carnegie Aluminum Door Window Carnage | Pennsylvania Power & Light Co. York Haven |
| Carnegie Brothers & Co. Limited – Pittsburgh | Pennsylvania Power & Light Martins Creek Power Plant Martins Creek |
| Carnegie Homestead Steel Works Munhall | Pennsylvania Power & Light New Castle Plant Pittsburgh |
| Carnegie Illinois Steel Corp. Allegheny City | Pennsylvania Power & Light Power Plant Storeroom Shamokin Dam |
| Carnegie Illinois Steel Corp. Clairton | Pennsylvania Power & Light Power Plant Storeroom Snyder City |
| Carnegie Illinois Steel Corp. Dravosburg | Pennsylvania Power & Light Suburban Plant Storeroom Scranton |
| Carnegie Illinois Steel Corp. Duquesne | Pennsylvania Power & Light, Turbine – Pittsburgh |
| Carnegie Illinois Steel Corp. Etna | Pennsylvania Power Co. – Ellwood City |
| Carnegie Illinois Steel Corp. Farrell | Pennsylvania Power Co. Cheswick Station – Cheswick |
| Carnegie Illinois Steel Corp. Irving | Pennsylvania Power Co. Connellsville |
| Carnegie Illinois Steel Corp. Pencoyd | Pennsylvania Power Co. Courtney |
| Carnegie Illinois Steel Corp. Pittsburgh | Pennsylvania Power Co. Ellwood City |
| Carnegie Inst. of Tech. Morewood Gardens A-D Towers Pittsburgh | Pennsylvania Power Co. Monongahela |
| Carnegie Institute of Technology – Pittsburgh | Pennsylvania Power Co. New Castle |
| Carnegie Institute of Technology, Hameraschlag Hall – Pittsburgh | Pennsylvania Power Co. Shippingport |
| Carnegie Library – Munhall | Pennsylvania Power Co. Springdale |
| Carnegie Library – Oakland | Pennsylvania Power Light – Martins Creek |
| Carnegie Library Extension – Pittsburgh | Pennsylvania Power Light Allentown |
| Carnegie Library Munhall | Pennsylvania Power Light Brunners Island |
| Carnegie Mellon University – Pittsburgh | Pennsylvania Power Light Holtwood Station |
| Carnegie Natural Gas Co. – Pittsburgh | Pennsylvania Power MItchell Plant Courtney |
| Carnegie Phipps & Co. Limited – Munhall | Pennsylvania Power Pittsburgh |
| Carnegie Phipps & Co. Limited Pittsburgh | Pennsylvania Pulp & Paper Co. – Lock Haven |
| Carnegie Sheet Co. Pittsburgh | Pennsylvania Pump & Compressor Co. |
| Carnegie Steel Co. Allegheny | Pennsylvania Railroad Broad St. Station Philadelphia |
| Carnegie Steel Co. Bessemer | Pennsylvania Railroad Co. 28Th St. Powerhouse Pittsburgh |
| Carnegie Steel Co. Clairton | Pennsylvania Railroad Co. Altoona |
| Carnegie Steel Co. Cochran Station | Pennsylvania Railroad Co. Blairsville |
| Carnegie Steel Co. Duquesne | Pennsylvania Railroad Co. Car Shops Altoona |
| Carnegie Steel Co. Farrell | Pennsylvania Railroad Co. Chambersburg |
| Carnegie Steel Co. Munhall | Pennsylvania Railroad Co. Chester |
| Carnegie Steel Co. New Castle | Pennsylvania Railroad Co. Conway |
| Carnegie Steel Co. Pittsburgh | Pennsylvania Railroad Co. Enola |
| Carnegie Steel Co. Rankin | Pennsylvania Railroad Co. Erie |
| Carnegie Steel Co. Sharon | Pennsylvania Railroad Co. Foundries Altoona |
| Carnegie Steel Co. South Duquesne | Pennsylvania Railroad Co. Hollidaysburg |
| Carnegie Steel Co. Works Munhall | Pennsylvania Railroad Co. Juanita |
| Carnegie Steel Duquesne | Pennsylvania Railroad Co. Lawrence Junction |
| Carnegie Tech – Carnegie | Pennsylvania Railroad Co. Media |
| Carnegie Tech – McKees Rocks | Pennsylvania Railroad Co. New Castle |
| Carnegie Technical School – Pittsburgh | Pennsylvania Railroad Co. Paoli |
| Carnegie Tube Co. – Carnegie | Pennsylvania Railroad Co. Philadelphia |
| Carnegie-Illinois Steel Corp. – Irwin | Pennsylvania Railroad Co. Pitcairn |
| Carnegie-Illinois Steel Corp. – Pittsburgh | Pennsylvania Railroad Co. Pittsburgh |
| Carnegie-Illinois Steel Corp. – Rankin | Pennsylvania Railroad Co. Pottsville |
| Carpenter Steel Co. – Reading | Pennsylvania Railroad Co. Reading |
| Carpenter Technology Corp. Reading | Pennsylvania Railroad Co. Renovo |
| Carpenters Local 2850 – Philadelphia | Pennsylvania Railroad Co. Repair Shop |
| Carpenters Union – Local 1462 – Philadelphia | Pennsylvania Railroad Co. Ronovo |
| Carrie Furnace Co. – Pittsburgh | Pennsylvania Railroad Co. Shire Oaks |
| Carrie Furnace Co. Rankin | Pennsylvania Railroad Co. South Altoona |
| Carrie Furnace Irvin | Pennsylvania Railroad Co. St. Altoona |
| Carrier Corp. Green Tree | Pennsylvania Railroad Co. Station 1560 Juniata Shop Altoona |
| Carson Industrial Development Corp. – Pittsburgh | Pennsylvania Railroad Co. Steam Heating Plant Philadelphia |
| Cartech Corp. – Reading | Pennsylvania Railroad Co. Three Mile Island Nuclear Power Plant |
| Cascade Coal & Coke Co. – Sykesville | Pennsylvania Railroad Freight Station Harrisburg |
| Cascade Coal & Coke Co. Tyler | Pennsylvania Railroad Meadows Shops |
| Case Erie Supply Corp. – Erie | Pennsylvania Railroad Office – Philadelphia |
| Cash & Carry Lumber Co. – Derry | Pennsylvania Railroad Repair Shop Hollidaysburg |
| Castanea Mill Lock Haven | Pennsylvania Railroad Shops – Philadelphia |
| Castanea Paper Co. – Johnsonburg | Pennsylvania Railroad Shops – Renovo |
| Castle Brand Meats New Castle | Pennsylvania Railroad Station Pittsburgh |
| Castle Co. Shannon | Pennsylvania Railroad Three Mile Island Nuclear Power Plant – Harrisburg |
| Castle Rubber Co. – Butler | Pennsylvania Railway Co. – Lawrence Junction |
| Castle Village Shopping Center – Whitehall | Pennsylvania Range Boiler – Philadelphia |
| Catalytic Construction Co. Philadelphia | Pennsylvania Reading- Conrail Railroad Roundhouse |
| Catalytic, Inc. – Philadelphia | Pennsylvania Reading Seashore Lines – Conrail Railroad Cars |
| Catasauqua Manufacturing Co. – Catasauqua | Pennsylvania Reading Seashore Lines Camden |
| Caterpillar Tractor Co. – E. York | Pennsylvania Refining Co. Building 38- 31 Karns City |
| Caterpillar Tractor Co. Building B York | Pennsylvania Rubber Co. Erie |
| Caterpillar Tractor Co. Memory Lance York | Pennsylvania Rubber Co. Jeanette |
| Caterpillar Tractor Co. York | Pennsylvania Rubber Co. Jeannette |
| Catholic Diocese – Greensburg | Pennsylvania Salight Manufacturing Co. Natrona |
| Catholic Parish Carlisle Pike Camp Hill | Pennsylvania Salk Manufacturing Co. – Natrona Heights |
| Cebor Construction Corp. Pittsburgh | Pennsylvania Salt Manufacturing Co. Natrona |
| Ceco Mifflin | Pennsylvania Salt Mill |
| Ceco North Side | Pennsylvania Smelting & Refining Co. – Philadelphia |
| Cedar Cliff Silk Co. – Chambersburg | Pennsylvania Smelting Refining Co. Philadelphia |
| Cedar Steam Electric Station Harrisburg | Pennsylvania State Corrections Institution- Dining Hall – Cambridge Springs |
| Cederbrook Hills Apartments – Cedarbrook Hills | Pennsylvania State Hospital For Tuberculosis – Hamburg |
| Celotex Corp. – Philadelphia | Pennsylvania State Park – Pittsburgh |
| Cenco Construction Inc. Philipsburg | Pennsylvania State Park – Racoon State Park – Pittsburgh |
| Center Crest Home – Bellefonte | Pennsylvania State Park Pittsburgh |
| Center Township Authority – Center Township | Pennsylvania State Penitentiary Dept. of Justice Prison Site Graterford |
| Central Administration Area- Selinsgrove Center – Selinsgrove | Pennsylvania State Reform School – Morganza |
| Central Blood Bank – Oakland | Pennsylvania State Training School – Morganza |
| Central Boilers Dept End Yard Steelton | Pennsylvania State University – Star Junction |
| Central Building – New Castle | Pennsylvania State University Engineering Research State College |
| Central Catholic High School – Allentown | Pennsylvania Steel Chester |
| Central Cement Co. – Colplay | Pennsylvania Steel Co. Coke Ovens Steelton |
| Central Dist. & Printing Tel Co. – Pittsburgh | Pennsylvania Steel Co. Lebanon Furnace Lebanon |
| Central District & Printing Telegraph Co. – Pittsburgh | Pennsylvania Steel Co. Lebanon |
| Central Garage – Titusville | Pennsylvania Steel Co. Philadelphia |
| Central Gas & Electric – Middletown | Pennsylvania Steel Co. Steelton |
| Central High School – Philadelphia | Pennsylvania Steel Mill Chester |
| Central High School Ogontz & Olney Avenues – Philadelphia | Pennsylvania Sugar Co. Philadelphia |
| Central Iron & Steel Co. – Harrisburg | Pennsylvania Sugar Division, Philadelphia |
| Central Land Co. – Pittsburgh | Pennsylvania Traction Co. – Butler |
| Central New Jersey Railroad – Bethlehem | Pennsylvania Training School Morganza |
| Central Poor District of Luzerne Co. – Wilkes Barre | Pennsylvania Tube Co. – Pittsburgh |
| Central Poor District of Luzerne County – Retreat | Pennsylvania Turnpike – Harrisburg |
| Central Power Plant – Pittsburgh | Pennsylvania Turnpike Admin – Highspire |
| Central Railroad Electric Light Plant Ashley | Pennsylvania Turnpike Harrisburg |
| Central Railroad Of New Jersey – Ashley | Pennsylvania Utilities Co. – Easton |
| Central Railroad of New Jersey Ashley | Pennsylvania Utilities Investment Corp. – Scranton |
| Central Works – Lebanon | Pennsylvania Water & Power Co. – Holtwood |
| Centralia Colliery – Centrailia | Pennsylvania Water Co. – Nadine |
| Centre Community Hospital – State College | Pennsylvania Water Co. Wildwood |
| Century Iii Mall – Mifflin | Pennsylvania Water Co. Wilkinsburg |
| Certain Teed Production Corp. – York | Pennsylvania, Commonwealth Slippery Rock |
| Certainteed – Mountain Top | Pennsylvnia Co. Pittsburgh |
| Certainteed Boiler House – Ambler | Penntech Papers Inc. Johnsonburg |
| Certainteed Conshohocke | Pennwalt Chemical Corp. Philadelphia |
| Certainteed Corp. – Ambler | Pennyslvania Central Railroad |
| CertainTeed Corp. Valley Forge | Pennzoil Co. Plant 1 Rouseville |
| Certainteed Insulation – Industrial Park Mountain Top | Pennzoil Co. Plant 2 Oil City |
| Certainteed Plant – York | Pennzoil OIl Co. Oil City |
| Certain-Teed Production Corp. – York | Pennzoil OIl Co. Pittsburgh |
| Certainteed Products Co. – Philadelphia | Pennzoil OIl Co. Rouseville |
| Certainteed Products Corp. York | Pennzoil Refinery Elizabeth |
| Certainteed Valley Forge | Pennzoil Refinery Oil City |
| Chamber Of Commerce Building – Pittsburgh | Pennzoil Refining – Rouseville |
| Chamber Reduction Co. McKeesport | Pennzoil Refining Co. Plant # 1 Rouseville |
| Chamberlain Ammunition Depot Scranton | Pennzoil Refining Plant 1 – Rouseville |
| Chamberlain Coal Co. – Port Carbon | Penreco-Pennsylvania Refining Co. Karns City |
| Chamberlain Coal Co. Pottsville | Pens Valley Insulation – Lester |
| Chamberlain Steel – Scranton | Pensylvania Forge Corp. Tacony Philadelphia |
| Chamberot Commerce Building – Pittsburgh | Pensylvania Railroad Co. – Altoona |
| Chambersburg Hospital – Chambersburg | Penzoil Co. Plant #4 – Houserville |
| Chambersburg Market – Chambersburg | Penzoil Co. South Penn Oi Oil City |
| Chambersburg Powerhouse – Chambersburg | Penzoil Refinery Oil City |
| Chambersburg Powerhouse Chambersburg | People Ice & Cold Storage Co. – McKeesport |
| Champion Construction Co. – Philadelphia | People Natural Gas White Valley |
| Champion Dish Washing Machine Co. Erie | People Traction Co. – Philadelphia |
| Champion Valley Farm – Lime Ridge | Peoples Bank – Wilkes Barre |
| Channellock – Meadville | Peoples Bank Building – Pittsburgh |
| Chanticlegr Condominiums – Pittsburgh | Peoples Bank Wilkes Barre |
| Chapman – Lehigh County | Peoples Coal Co. Oxford Switch |
| Char. Wallace – New Castle | Peoples Coal Co. Scranton |
| Charleroi Brewing Co. – Charleroi | Peoples Consolidated Service Corp. – Easton |
| Charleroi Construction Co. – Pittsburgh | Peoples Construction – Philadelphia |
| Charleroi Methodist Church – Charleroi | Peoples Electric Light, Heat & Power Co. – Greensburg |
| Charleroi Plate Glass Co. – Pittsburgh | Peoples Ice & Cold Storage Co. McKeesport |
| Charleroi Water Co. – Charleroi | Peoples Ice Light & Storage Co. McKeesport |
| Charles A. Briggs Lumber & Manufacturing Co. – Scottsdale | Peoples Incandescent Light & Power Co. – Meadville |
| Charles Alter, Contractor Sharon | Peoples Land Co. – Pittsburgh |
| Charles Cole Hospital – Coudersport | Peoples Light Heat & Power Co. – Mahanoy City |
| Charles D. Kaier Co. Limited – Mahanoy City | Peoples Natural Gas – Brave |
| Charles E. Johnson & Co. – Philadelphia | Peoples Natural Gas Co. – Braceton |
| Charles E. Langcake – Philadelphia | Peoples Natural Gas Co. Office Building Wilkinsburg |
| Charles E. Monday & Co. Philadelphia | Peoples Power Co National Tube – Ellwood City |
| Charles H. Boehm High School – Bucks County | Peoples Power Co. Elwood City |
| Charles H. Caspar for Class & Nachod Bwg. Co. Philadelphia | Peoples Savings & Trust Building – Pittsburgh |
| Charles Lachman Co. Inc. – Phoenixville | Peoples Street Railway Co. – Nanticoke |
| Charles Lenning & Co. Inc. – Philadelphia | Peoples Street Railway Co. Alden |
| Charles Lenning, Tacony Chemical Works Philadelphia | Peoples Street Railway Co. Wanamie |
| Charles Mccaul Co. – Philadelphia | Pep Boys – Philadelphia |
| Charles St. Suppes – Johnstown | Pepperidge Farms – Downington |
| Charles T. Schoen – Philadelphia | Peps Boys – Robinson Township |
| Charles, Lachman Div Phoenixville | Pepsi- Cola – McKees Rocks |
| Charleytown – Sykesville | Perkins & Co. Limited – Sharpsville |
| Charlie Rupp – Indiana | Perlstein Glass Co. Richmond Street Philadelphia |
| Charmi Tuntannock | Permali Corp. – Mt. Pleasant |
| Charmin Paper Co – Mechoopany Mill – Tunkhannock | Perrex Aluminum Wellsville |
| Charmin Paper Co. – Meshoppen | Perry Iron Co. – Erie |
| Charmin Paper Co. – Scranton | Perry Lower Tyrone School Fayette County |
| Charmin Paper Co. Outdoor Tank Scranton | Perry Ship Builders Company Erie |
| Charmin Paper Mill – Mahoopeny | Pes Valley Insulation Co. Lester |
| Charmin Paper Products Co. – Kelogpany | Peter F. Loftus – Pittsburgh |
| Charmin Paper Products Co. Mehoopany Station | Peter Paul Cadbury Yalmont Ind Park – Hazleton |
| Charmin Paper Rod Co. Mehoopany | Peter Township Sewage Plant – Peter Township |
| Charter Plastics – Titusville | Peters & Co. – McKeesport |
| Chartier Valley High School – Pittsburgh | Peters Packing Co. – McKeesport |
| Chartiers Shopping Center – Collier Township | Peters Township High School – Peters Township |
| Chartiers Valley High School – Pittsburgh | Peters Township Jr. High School – Peters Township |
| Chartiers Valley School District – Pittsburgh | Petroleum Ironworks – Sharon |
| Chas St Suppes – Johnstown | Petroleum Reclamation Co. – Bradford |
| Chas. E Langcake – Philadelphia | Petrowax – Emlenton |
| Chas. E. Johnson & Co. – Philadelphia | Petrowax Farmers Valley |
| Chas. E. Monday & Co. – Philadelphia | Pfizer Inc. – Easton |
| Chas. H. Caspar for Class & Nachod Bwg. Co. – Philadelphia | Pgh Transformer – Canonsburg |
| Chas. T. Schoen – Philadelphia | PgH. Coke & Chemical Neville Island |
| Chatham Center – Pittsburgh | Pgw Torresdale Philadelphia |
| Chelsy Products- Oakmont | Phiadelphia Exposition – Philadelphia |
| Chelten Supply House – Philadelphia | Phil Ellena & Chew Sts. – Philadelphia |
| Cheltenham High School – Cheltenham Township | Philada & Reading Railway – Philadelphia |
| Cheltenham Township | Philada Rapid Transit Co. – Philadelphia |
| Chem- Clay Corp. Carnegie | Philadelphia & Bristol Water Co. – Holmesburg |
| Chem- Clay Corp. Pittsburgh | Philadelphia & Reading Coal & Iron Co. Frackville |
| Chem-Clay Corp. – Carnegie | Philadelphia & Reading Coal & Iron Co. Good Spring |
| Chem-Clay Corp. – Pittsburgh | Philadelphia & Reading Coal & Iron Co. Locust Gap |
| Chemical Concentrates – Forrest Hills | Philadelphia & Reading Coal & Iron Co. Mahanoy Plane |
| Chemical Concentrates Fort Washington | Philadelphia & Reading Coal & Iron Co. Minersville |
| Chemical Division Oil City Plant Oil City | Philadelphia & Reading Coal & Iron Co. Mt Carmel |
| Chemical Division Penacol Plant Petrolia | Philadelphia & Reading Coal & Iron Co. Philadelphia |
| Chemical Pilot Plant Lock Haven | Philadelphia & Reading Coal & Iron Co. Pottsville |
| Chemical Plant Receiving Station 1 Philadelphia | Philadelphia & Reading Coal & Iron Co. Reading |
| Cherion & Radnor Gas & Electric Co. Wayne | Philadelphia & Reading Coal & Iron Co. Schuykill Haven |
| Cherokee Plant Research Building Nbr 108 Danville | Philadelphia & Reading Coal & Iron Co. St. Nicholas |
| Cherry River Paper Co. Philadelphia | Philadelphia & Reading Railway – Frackville |
| Cherry Service Station – Leechburg | Philadelphia & Reading Railway – Philadelphia |
| Chester Chemical – Chester | Philadelphia & Reading Subway – Philadelphia |
| Chester City – Valley Forge | Philadelphia Aquatic Club – Philadelphia |
| Chester High School – Chester | Philadelphia Asbestos Cork. Philadelphia |
| Chester Improvement Co. – Thurlow | Philadelphia Bank Building – Philadelphia |
| Chester Lace Co. – Chester | Philadelphia Board of Education – Philadelphia |
| Chester Laundry – Chester | Philadelphia Brewing Co. – Philadelphia |
| Chester Paper Co. – Chester | Philadelphia Burner Serv – Philadelphia |
| Chester Processing Co. – Chester | Philadelphia City Hall – Philadelphia |
| Chester Processing Co. Chester | Philadelphia City Hall Annex – Philadelphia |
| Chester University – Chester | Philadelphia City High School Philadelphia |
| Chester, Kennett & Wilmington Electric Railway Co. – Kettett Square | Philadelphia Co. – Canonsburg |
| Chestnut Hill Academy – Chestnut Hill | Philadelphia Co. Of Pittsburg – Pittsburgh |
| Chestnut Hill Hospital – Philadelphia | Philadelphia Coke Co. – Philadelphia |
| Cheswick Generating Station Power Plant – Springdale | Philadelphia College Of Pharmacy – Philadelphia |
| Cheswick Power Station – Springdale | Philadelphia Convention Hall – Philadelphia |
| Cheswick Power Station Cheswick | Philadelphia County Prison – Holmesburg |
| Chevron Asphalt Co. Springdale | Philadelphia County Prison Moyamensing |
| Chevron Oil Refinery | Philadelphia County Prison Philadelphia |
| Chevron Oil Refinery – Philadelphia | Philadelphia Dry Y- Philadelphia |
| Chevron Refinery & Atlantic Refinery | Philadelphia Dye Works – Philadelphia |
| Chevron Refinery & Atlantic Refinery – Philadelphia | Philadelphia Electric – Bridgeport |
| Chew-Bittel Co. – Doylestown | Philadelphia Electric Bristol Township |
| Cheyney State University – Cheyney | Philadelphia Electric Brunner Island York Haven |
| Chicago & St. Louis Railroad | Philadelphia Electric Co, Cromby Plant |
| Chicago B & I. Bell – Scranton | Philadelphia Electric Co. – Barbados Island |
| Chicago Bridge & Iron Co. – Greensburg | Philadelphia Electric Co. 9Th Willow Streets Philadelphia |
| Chicago Pneumatic Tool Co. – Franklin | Philadelphia Electric Co. Barbados Island |
| Chicago Pneumatic Tool Co. Pittsburgh | Philadelphia Electric Co. Barbados Station Norriton |
| Chickies Iron Co. – Chickies | Philadelphia Electric Co. Chester Generating Station Chester |
| Chilcoat – Castle Shannon | Philadelphia Electric Co. Conowingo |
| Childers Products – Bristol | Philadelphia Electric Co. Conshohocken |
| Childrens & Senior Home – New Brighton | Philadelphia Electric Co. Cromby Generating Station Phoenixville |
| Childrens Homeopathic Hospital – Philadelphia | Philadelphia Electric Co. Cromby Plant Cromby |
| Childrens Hospital – Ebensburg | Philadelphia Electric Co. Cromby Station E. Pikeland Township |
| Childrens Hospital – Philadelphia | Philadelphia Electric Co. Cromby Station Philadelphia |
| Children’s Reception Welfare – Philadelphia | Philadelphia Electric Co. Delaware Station |
| Childrens Reception Welfare Philadelphia | Philadelphia Electric Co. Eddystone 1 Philadelphia |
| Childrens Senior Home – New Brighton | Philadelphia Electric Co. Eddystone Generating Station Eddystone |
| Chilled Roll Foundry – Vandergrift | Philadelphia Electric Co. Oil Facility Philadelphia |
| Chipman Knitting Co. – Easton | Philadelphia Electric Co. Peach Bottom |
| Chippewa Sewage Plant Chippewa | Philadelphia Electric Co. Peco Building |
| Chiz Bros Co. Munhall | Philadelphia Electric Co. Philadelphia |
| Chiz Brothers, Inc. – Elizabeth | Philadelphia Electric Co. Richmond |
| Chocura – Philadelphia | Philadelphia Electric Co. Schuylkill Generating Station Philadelphia |
| Christ Evangelical Ref. Chuch – Harristown | Philadelphia Electric Co. Southwark |
| Christ M E Church – Pittsburgh | Philadelphia Electric Co. Station C Philadelphia |
| Christ M.E. Church – Pittsburgh | Philadelphia Electric Co. Tacony |
| Christian Street Schuylkill Station – Philadelphia | Philadelphia Electric Delta |
| Christopher Mining Co. – Washington | Philadelphia Electric Falls Township |
| Chromatube Dunemore | Philadelphia Electric Peachbottom Nuclear Delta |
| Chrysler Corp. New Castle | Philadelphia Electric Philadelphia |
| Chrysler Corp. Perrysburg | Philadelphia Electric Phoenixville |
| Chrysler Depot – Oakdale | Philadelphia Electric Plant – Philadelphia |
| Church – Johnstown | Philadelphia Electric Plant Barbados Island Philadelphia |
| Church – Whitehall | Philadelphia Electric Pottstown |
| Church of Christ – Baldwin | Philadelphia Electric Powerhouse – Philadelphia |
| Church Of The Holy Spirit – Palmyra | Philadelphia Electric Richmond Philadelphia |
| Churchville Elementary School – Holland | Philadelphia Electric Sanatoga |
| Cia Panamona De Fuerzas Y Luz Panama City | Philadelphia Electric Limerick Nuclear Power Plant – Limerick |
| Circle Heating Service Pittsburgh | Philadelphia Engineering Co. – Philadelphia |
| Citicorp Venture Capital – Latrobe | Philadelphia Exposition – Philadelphia |
| Cities Service Oil Co. – Philadelphia | Philadelphia Fire Department – Philadelphia |
| Citizens Bank – Latrobe | Philadelphia Fire Dept. – Philadelphia |
| Citizens Electric Illuminating Co. – Pittston | Philadelphia Forge Co. – Philadelphia |
| Citizens Electric Light & Power Co. – McDonald | Philadelphia Forge Philadelphia |
| Citizens Electric Light Co. – Braddock | Philadelphia Gas & Electric – Philadelphia |
| Citizens Electric Light Heat & Power Co. – Lancaster | Philadelphia Gas Works Plant Philadelphia |
| Citizens Electric Light, Heat & Power Co. – Lancaster | Philadelphia Gas Works Station A & B Philadelphia |
| Citizens General Hospital – New Kensington | Philadelphia Gear Works King of Prussia |
| Citizens Light Heat & Power Co. – Johnstown | Philadelphia General Hospital – Philadelphia |
| Citizens Light, Heat & Power Co. – Johnstown | Philadelphia General Hospital Student Nurses Dormitory Philadelphia |
| Citizens Water Co. – McDonald | Philadelphia Greyhound Terminal – Philadelphia |
| Citizens Water Supply Co. – Washington | Philadelphia Group – Philadelphia |
| City Electric Light Co. Allegheny City | Philadelphia Home For Indigent & House Of Correction – Holmesburg |
| City Hall & Courthouse – Easton | Philadelphia Hospital For Insane – Philadelphia |
| City Mill – Philadelphia | Philadelphia Housing Authority – Philadelphia |
| City of Erie – Erie | Philadelphia Incinerator – Philadelphia |
| City Of Lancaster Dept. Of Water – Lancaster | Philadelphia Inquirer Office Building Philadelphia |
| City Of Lancaster Pa Department of Water – Lancaster | Philadelphia Institute for Feeble Minded Byberry |
| City of Lancaster – Department of Water | Philadelphia International Airport – Philadelphia |
| City Of Mckeesport Water Dept. – McKeesport | Philadelphia Ironworks – Philadelphia |
| City of Monessen – Monessen | Philadelphia Morton & Swarthmore Street Railway Folsom Station |
| City Of Philadelphia – Dept. Of Streets Sanitation – Philadelphia | Philadelphia Museum – Philadelphia |
| City Of Philadelphia – Yard & Garage Office Building – Philadelphia | Philadelphia National Bank Philiadelphia |
| City Of Philadelphia Dept. Of Streets Sanitation – Philadelphia | Philadelphia Naval Shipyard – Philadelphia |
| City Of Philadelphia Yard & Garage Office Building – Philadelphia | Philadelphia Naval Yard |
| City of Pittsburgh 28Th Street Incinerator Plant Pittsburgh | Philadelphia Navy Shipyard – Philadelphia |
| City of Pittsburgh Asphalt Plant Pittsburgh | Philadelphia Piping & Equipment Co. – Bristol |
| City Of Pittsburgh Brilliant Pumping Station – Pittsburgh | Philadelphia Protectory For Boys – Phoenixville |
| City Of Pittsburgh Department Of Charities – Marshalsea | Philadelphia Psychiatric Hospital – Philadelphia |
| City Of Pittsburgh Mayview Plant – Pittsburgh | Philadelphia Public Library – Philadelphia |
| Civic Arena | Philadelphia Quartz Co. – Chester |
| Civic Arena – Pittsburgh | Philadelphia Quartz Co. Philadelphia |
| Civic Center 34Th Street Philadelphia | Philadelphia Railroad Reading |
| Claire Furnace Co. – Sharpsville | Philadelphia Rapid Transit Co. – Doylestown |
| Clairton By-Products Coke Works – Clairton | Philadelphia Reading Coal & Iron Co. Mahanoy Plane |
| Clairton Coke Coal Chemical Works Rubel Clairton | Philadelphia Reading Corp. – Pottsville |
| Clairton Cooling Tower – Clairton | Philadelphia Resin Co. – Philadelphia |
| Clairton Courthouse Clairton | Philadelphia Roll & Machine – Philadelphia |
| Clairton High School – Clairton | Philadelphia Rubber Co. Works Co. Oaks |
| Clairton Municipal Clairton | Philadelphia Rust – Philadelphia |
| Clairton Power Station – Clairton | Philadelphia Rust Proof C Philadelphia |
| Clairton Sewage Treatment Plant – Clairton | Philadelphia Sc 10 Customer Pick Up Berwyn |
| Clairton Sportsmans Club – Clairton | Philadelphia School District – Philadelphia |
| Clairton Steel Co. – Clairton | Philadelphia Ship Maintenance Philadelphia |
| Clairton Steel Works & Furnaces – Clairton | Philadelphia Shipyard Philadelphia |
| Clairton Works Methyl Naptheline Division Clairton | Philadelphia St Hospital – Philadelphia |
| Clairton Works Tar Distillation Plant Clairton | Philadelphia Steam Heating Co. – Philadelphia |
| Clarion County Home – Sligo | Philadelphia Stockyards Philadelphia |
| Clarion County Vo- Tech – Clarion | Philadelphia Suburban – Chester |
| Clarion Glass Factory – Clarion | Philadelphia Suburban Gas & Electric Co. – Jenkinstown |
| Clarion Hospital – Clarion | Philadelphia Suburban Gas & Electric Co. Chester |
| Clarion Mall – Clarion | Philadelphia Suburban Water Co. – Bryn Mawr |
| Clarion Mills – Johnsonburg | Philadelphia Suburban Water Co. Crum Creek |
| Clarion Osteopathic Community Hospital – Clarion | Philadelphia Suburban Water Co. Janney |
| Clarion State College Field House – Clarion | Philadelphia Suburban Water Co. Media |
| Clarion Steel Works – Pittsburgh | Philadelphia Tapestry Mills – Philadelphia |
| Clarks Summit State Hospital – Clarks Summit | Philadelphia Traction Co. – Philadelphia |
| Clarkson Chemical Co. – Williamsport | Philadelphia Wool Scourin Philadelphia |
| Clay Mill Works – Clearfield | Philadelphia Works – Philadelphia |
| Clay Mill Works No .3 Works Clearfield | Philadelphia Zoo – Philadelphia |
| Clear Spring Coal Co. – Pittston | Philadelphila Traction Co. – Philadelphia |
| Clear Spring Coal Co. Pittston | Philadelpia Electric Co. – Philadelphia |
| Clearfield Bank – Philadelphia | Philadelpia Inquirer Garage – Philadelphia |
| Clearfield High School – Clearfield | Philco – Blue Bell |
| Clearfield Hospital – Clearfield | Philip Carey Manfuacturing Co. – Plymouth Meeting |
| Clearfield Steam Heating Co. – Clearfield | Philipsburg Junior High School – Philipsburg |
| Clearview Elementary School – Bethlehem | Philipsburg Osceola School District – Philipsburg |
| Clearview Mall – Butler | Phillip Carey Manufacturing Co. – Philadelphia |
| Cleaver Brooks Boiler Plant – Lebanon | Phillip Carey Plymouth |
| Cleaver Brooks Co. – Lebanon | Phillips Gas Co. – Craigsville |
| Cleaver Brooks Lebanon Downingtown | Phillips Generating Station South Heights |
| Cleaver- Brooks, Lebanon | Phillips Mine Co. |
| Clermont Engineering Co. I Philadelphia | Phillips Petroleum Co. – Hanover |
| Clermont Engineering Philadelphia | Phillips Power Station – Crescent Township |
| Cleveland Erie Co. – Elk Station | Philmond Association & Av Invs Huntingdon Valley |
| Cleveland Worsted Mills Co. – Philadelphia | Phodia, Inc. – Morrisville |
| Climax Molybdenum Co. Langeloth Burgettstown | Phoenix Cement Co. – Nazareth |
| Climax Steel – Burgettstown | Phoenix Cement Co. Nazareth |
| Clinton G. Hodder – Pittsburgh | Phoenix Glass Co. – Monaca |
| Clinton Iron & Steel Co. – Pittsburgh | Phoenix Glass Co. Pittsburgh |
| Closure Plant – Lancaster | Phoenix Glass House – Monaca |
| Closure Plant Building 13- D Plant Building Lancaster | Phoenix Glass Monaca |
| Co. Braeburn – Braeburn | Phoenix Iron & Steel – Phoenixville |
| Coal & Coke By-Products Co. – Pittsburgh | Phoenix Iron & Steel Co. – Chester |
| Coal Brooke Mine – Carbondale | Phoenix Iron & Steel Co. Harrisburg |
| Coal Cleaning Plant – Colver | Phoenix Iron Co. – Phoenixville |
| Coal Conversion Gasification Plant – Bruceton | Phoenix Steel Corp. – Phoenixville |
| Coal Conversion Gasification Plant – Homer City | Phoenix Utility Co. – Hauto |
| Coal Glen | Phoenix Utility Co. Pine Grove |
| Coal Hydrogenation Pilot Plant Verona | Phoenix Utility Co. Williamsport |
| Coal Mines – Indiana | Phoenixville Hospital – Phoenixville |
| Coal Plant – Vestaburg | Phoenixville Incinerator – Phoenixville |
| Coal Preparation Plant – Hoststutler | Phoenixville Steel – Phoenixville |
| Coalfax Power Station – Cheswick | Physical Test Labs – Coatesville |
| Coatesville Rolling Mill Co. – Coatesville | Physicians & Dentist Building – Philadelphia |
| Cochran Motors – Monroeville | Picco Hercules Chemical – Clairton |
| Cochran Nissan – Butler | Picco. Hercules Chemical – Elizabeth |
| Cochran Times Cochranton | Pickard Joseph Sons Co. Philadelphia |
| Cochrane D & V Crane Corp. – Kimberton | Pickett Middle School Wayne Chelten Philadelphia |
| Codo Manufacturing Corp. Leetsdale | Pickles Steak House – Horsham |
| Cogeneration Plant – Hazelton | Pico Chemical – Chester |
| Cogeneration Plant – Williamsport | Pico Chemical Clairton |
| CoInco – Cochranton | Pierce Glass Co. The Port Allegany |
| Coke – Philadelphia | Pieroe Glass Co. – Port Allegany |
| Coke Boiler House – Bethlehem | Pillsbury Plant – Greenville |
| Coke Oven Division – Bethlehem | Pilot Plant – Pittsburgh |
| Coke Plant Johnstown | Pilot Plant Division – Philadelphia |
| Colbers Mine | Pilot Plant- Station 73 |
| Cold Springs Bleachery – Yardley | Pine Grove S.E. Station – Pine Grove |
| Cole Co. – Philadelphia | Pine High School – Pine Township |
| Coleman Motors – Wilkinsburg | Pine Knot Colliery – Minersville |
| Colfax Power Station – Springdale | Pine Ridge Stirling Boiler House – Hudson |
| Coll Tire Recapping – Burgettstown | Pine Township Coal Co. – Heilwood |
| College Park – Monroeville | Pipeline Service Co. – Glenwillard |
| Collieries Supply & Equipment Co. – Philadelphia | Piper Aircraft – Lock Haven |
| Colliery #18 – Wanamie | Piping Polystrene Plant Kobuta |
| Colliery Morris | Pitt Com Heat Treat Pittsburgh |
| Colliery Supply & Equipment – Philadelphia | Pitt Comm Heat Treating – Pittsburgh |
| Colonial #1 Plant – Smock Station | Pitt- Fab Pittsburgh |
| Colonial Aluminum & Smelting Co. – Columbia | Pitt Steel Foundry Machine Co. McKeesport |
| Colonial Berks Real Estate – Reading | Pitt-Fab – Pittsburgh |
| Colonial Coke Co. – Grindstone | Pittron A Textron Co. Glassport |
| Colonial Collieries Co. – Minersville | Pittron A Textron Co. Pittsburgh |
| Colonial Collieries Co. Mt Carmel | Pittron Co. McKeesport |
| Colonial Iron Co. – Riddlesburg | Pitts Coal Co. – Pittsburgh |
| Colonial Metals Co. Columbia | Pitts. Coal Aspen M Miller – Pittsburgh |
| Colonial Steel Co. – Monaca | Pitts. Comm. Heating Pittsburgh |
| Colonial Steel Co. Pittsburgh | Pittsburg Airport – Pittsburgh |
| Colonial Steel Co. South Monaca | Pittsburg Coal Co. – Scott Haven |
| Colonial Steel, Division Vanadium Alloys Steel Co. Monaca | Pittsburg Coke & Chemical Co. Neville Island |
| Colonial Supply Pittsburgh | Pittsburg McKeesport & Connellsville RR Pittsburgh |
| Colonial Trust Co. – Reading | Pittsburg Metal Process – Sharpsburg |
| Colt Industries Crucible, Inc. Midland | Pittsburg Pa Plant – Denbeau |
| Colt Industries Pittsburgh | Pittsburg Plate Glass Co. – Philadelphia |
| Colt Industries Stainless Steel Alloy Div. Midland | Pittsburg Plate Glass Co. Pittsburgh |
| Columbia Boiler Co. of Pot Pottstown | Pittsburg Seamless Tube Co. – Beaver Falls |
| Columbia Bridge Co. – Carnegie | Pittsburg Shear Knife & Machine Co. Pittsburgh |
| Columbia County Courthouse – Bloomsburg | Pittsburg Steel Co. – Pittsburgh |
| Columbia Hospital – Wilkinsburg | Pittsburg Steel Foundry – Pittsburgh |
| Columbia Metals Co. Columbia | Pittsburgh & Birmingham Traction Co. – Pittsburgh |
| Columbia Plumbing Supply House – Philadelphia | Pittsburgh & Butler Street Railway Co. – Renfrew |
| Columbia Rolling Mill Co. – Harrisburg | Pittsburgh & Butler Street Railway Co. Butler County |
| Columbia Rolling Mill Co. Watts | Pittsburgh & Butler Street Railway Co. Renfrew |
| Columbia Rolling Mill Co. Wrightsville | Pittsburgh & Conneaut Dock Co. – Pittsburgh |
| Columbia Water Co. – Columbia | Pittsburgh & End Passenger Railway Co. – Pittsburgh |
| Columbian Carbon Co. – Philadelphia | Pittsburgh & Lake Erie Railroad – Glassport |
| Comanco Inc. Berwick | Pittsburgh & Lake Erie Railroad Co. – Pittsburgh |
| Combined Paper Mills Inc. Roaring Springs | Pittsburgh & Lake Erie Railroad Glassport |
| Combustion Engineering, Inc. Metropolitan Edison Reading | Pittsburgh & Virginia Railway Co. – Rook |
| Combustion Engineering, Inc. Monongahela | Pittsburgh & Westend Pars. Railway Co. – Pittsburgh |
| Combustion Engineering, Inc. Port Kennedy | Pittsburgh Activated Carbon Co. Dept Pittsburgh |
| Combustion Engineering, Inc. Scranton | Pittsburgh Airport – Pittsburgh |
| Combustion Equipment Service Oreland | Pittsburgh Athletic Association Land Co. Pittsburgh |
| Combustion Equipment Service Quakertown | Pittsburgh Athletic Association Pittsburgh |
| Combustion Systems Pittsburgh | Pittsburgh Brewing Co. Pittsburgh |
| Comet – Chester | Pittsburgh Bridge Co. Rochester |
| Comfort Inn – Pittsburgh | Pittsburgh Buffalo Co. – Burgettstown |
| Cominsky Warehouse – Windber | Pittsburgh Buffalo Co. Ellsworth |
| Cominsky Warehouse – Wison | Pittsburgh Buffalo Co. Marianna |
| Commerce Square – Philadelphia | Pittsburgh Buffalo Co. Pittsburgh |
| Commerce St. Building – Philadelphia | Pittsburgh City, Flower Co. Gibsonia |
| Commerce Street Building – Philadelphia | Pittsburgh Coal & Iron Co. |
| Commercial & Industrial Jobs – Luzerne County | Pittsburgh Coal Co. Allegheny |
| Commercial Alcohol – Philadelphia | Pittsburgh Coal Co. Grindstone |
| Commercial Asbestos Paper – Erie | Pittsburgh Coal Co. Imperial |
| Commercial Gazette Building – Pittsburgh | Pittsburgh Coal Co. Pittsburgh |
| Commercial Industrial Jobs – Luzerne County | Pittsburgh Coal Co. Shops – Library |
| Commercial Jobsites – Altoona | Pittsburgh Coke & Chemical – Clairton |
| Commons At Fallsington – Morrisville | Pittsburgh Coke & Chemical – Monessen |
| Commonwealth Ave. & Foster St. | Pittsburgh Coke & Chemical Co. – McKees Rocks |
| Commonwealth of Pa Selinsgrove | Pittsburgh Coke & Iron Co. – Pittsburgh |
| Commonwealth Of Pennsylvania – Dept. Of Public Instruction – Indiana | Pittsburgh Coke Chemical Clairton |
| Commonwealth Of Pennsylvania – Laurelton State Village – Laurelton | Pittsburgh Coke Chemical McKees Rocks |
| Commonwealth Of Pennsylvania – State Teachers College – Indiana | Pittsburgh Coke Chemical Monessen |
| Commonwealth Of Pennsylvania- Dept. Of Public Instruction – Clarion | Pittsburgh Coke Chemical Neville Island |
| Commonwealth of Pennsylvania Institution Storeroom Dept Justice – Bellefonte | Pittsburgh Coke Iron Co. Pittsburgh |
| Commonwealth Of Pennsylvania- State Corr Inst. – Bellefonte | Pittsburgh Commercial – Pittsburgh |
| Commonwealth of Pennsylvania State Penitentiary Graterford | Pittsburgh Commercial Heating – Pittsburgh |
| Commonwealth Title Insurance & Trust Co. – Philadelphia | Pittsburgh Conneaut Dock Co. – Pittsburgh |
| Commonwealth Trust Co. – Pittsburgh | Pittsburgh Consolidation Coal Co – Library |
| Community Central Energy Corp. – Scranton | Pittsburgh Consolidation Coal Co. Mine Pilot Plant |
| Community Home Improvement Co. Reading | Pittsburgh Consolidation Coal Co. Pilot Plant Library |
| Community Medical Center – Scranton | Pittsburgh Consolidation Coal Co. Pilot Plant Storeroom Library |
| Con. Braeburn- Braeburn | Pittsburgh Consolidation Coal Co. R D Division Library |
| Conair Manufacturing Facility – Franklin | Pittsburgh Consolidation Coal Co. Storeroom Library |
| Conemaugh Generating Station Unit 1-2 New Florence | Pittsburgh Construction & Engineering Co. – Pittsburgh |
| Conemaugh Power Plant – Johnstown | Pittsburgh Corning – Owenton |
| Conemaugh Power Station -Johnstown | Pittsburgh Corning Corp. – Port Allegany |
| Conemaugh Power Station Units #1 #2 New Florence | Pittsburgh Corning Corp. Pittsburgh |
| Conemaugh Station – Huff | Pittsburgh Corning Plant Port Allegany |
| Conemaugh Station – Miller Planner Bldg – Markleysburg | Pittsburgh Cot Flower Co. – Gidsoni |
| Conemaugh Station Unit 1 – Pittsburgh | Pittsburgh Crankshaft Service – Pittsburgh |
| Conemaugh Steam Electric Station – Conemaugh Indiana County | Pittsburgh Crucible Steel Co. – Midland |
| Conemaugh Valley Memorial Hospital – Johnstown | Pittsburgh Crucible Steel Midland |
| Conestoga Traction Co. – Lancaster | Pittsburgh Cut Flower Co. Gibsonia |
| Conewango Refining Co. – Warren | Pittsburgh Department of Charities Marshalsea |
| Congoleum Co. Inc. – Maple Glen | Pittsburgh Des Moines Steel Pittsburgh |
| Congoleum Co. Inc. Marcus Hook | Pittsburgh Design Services – Carnegie |
| Congoleum Co. Marcus Hook | Pittsburgh Die & Casting Co – Swissvale |
| Congoleum-Nairn, Inc. – Maple Glen | Pittsburgh Die Casting Co. Pittsburgh |
| Conn Welding & Machine Co. New Castle | Pittsburgh Ferromanganese Co. – Chester |
| Conneaut & Erie Traction Co. – Elk Station | Pittsburgh Flexicore Co. Monongahela |
| Connellsville Airport – Connellsville | Pittsburgh Forge & Iron Co. Allegheny |
| Connellsville Glass Plant – Connellsville | Pittsburgh Forge & Iron Co. Pittsburgh |
| Connellsville High Rise – Connellsville | Pittsburgh Forge & Iron Co. Woods Run |
| Connellsville Railroad | Pittsburgh Forgings Co. – Coraopolis |
| Connelly Containers – Philadelphia | Pittsburgh Gas & Coke Co. Glassport |
| Connelly Containers, Inc. Bala Cynwyd | Pittsburgh Gas & Coke Co. Pittsburgh |
| Connelly Containers, Inc. Philadelphia | Pittsburgh Gas Coal Co. – Iselin |
| Connelly Paper Co. Philadelphia | Pittsburgh Gear Co – Pittsburgh |
| Connor Towers – Johnstown | Pittsburgh Harmony Butler & New Castle RR Evans City |
| Conrail – Altoona | Pittsburgh Heat – Pittsburgh |
| Conrail – Hollidaysburg | Pittsburgh Housing Authority, Terrace Village Pittsburgh |
| Conrail Consolidated Railroad – Reading | Pittsburgh International Airport – Moon Township |
| Conrail Penn Central RR | Pittsburgh Iron & Steel Engineering Co. – Pittsburgh |
| Conshohocken – Clearfield | Pittsburgh Knife & Forge Co. – Coraopolis |
| Conshohocken Worsted Mills Co. – Connellsville | Pittsburgh Lake Erie Railroad Beaver Falls |
| Conshohocken Worsted Mills Co. Philadelphia | Pittsburgh Lake Erie Railroad Co. – McKees Rocks |
| Consolick Com Station – Tamarack | Pittsburgh Lake Erie Railroad Depot – Pittsburgh |
| Consolidated Cigar Co. – Lancaster | Pittsburgh Lake Erie Rr Depot – Pittsburgh |
| Consolidated Cigar Corp. – Carbondale | Pittsburgh McKeesport & Connellsville Railroad – Pittsburgh |
| Consolidated Cigar Corp. Carbon | Pittsburgh McKeesport & Westmoreland Railway Co. – McKeesport |
| Consolidated Cigar Corp. Mafco McAdoo | Pittsburgh Mechanical Systems Inc. – Pittsburgh |
| Consolidated Coal Co. – Library | Pittsburgh Metal Process – Pittsburgh |
| Consolidated Coal Co. New Kensington | Pittsburgh Milling Co. Allegheny |
| Consolidated Coal Co. Washington | Pittsburgh Milling Co. Pittsburgh |
| Consolidated Comstock Co. Pittsburgh | Pittsburgh National Bank – Aliquippa |
| Consolidated Gas Delmont | Pittsburgh National Bank – Pittsburgh |
| Consolidated Gas Supply Corp. – Pittsburgh | Pittsburgh Nipple Works Pittsburgh |
| Consolidated Gas Supply Corp. Station Sabinsville | Pittsburgh Plate (Ppg) Glass Plant – Creighton |
| Consolidated Ice Co. – Pittsburgh | Pittsburgh Plate Glass |
| Consolidated Mold Products – Scranton | Pittsburgh Plate Glass Co. Allegheny |
| Consolidated Rail Corp. – Philadelphia | Pittsburgh Plate Glass Co. Charleroi |
| Consolidated Railway Corp. Conway | Pittsburgh Plate Glass Co. Creighton |
| Consolidated Railway Corp. Enola | Pittsburgh Plate Glass Co. Ford City |
| Consolidated Railway Corp. Philadelphia | Pittsburgh Plate Glass Co. Harmarville |
| Consolidated Steel & Wire Co. – Allentown | Pittsburgh Plate Glass Co. Kennerdell |
| Consolidated Steel & Wire Co. – Beaver Falls | Pittsburgh Plate Glass Co. Natrium |
| Consolidated Steel & Wire Co. – Pittsburgh | Pittsburgh Plate Glass Co. Pittsburgh |
| Consolidated Steel & Wire Co. – Rankin | Pittsburgh Plate Glass Co. Port Kennedy |
| Consolidated Traction Co. – Pittsburgh | Pittsburgh Plate Glass Co. Springdale |
| Consolidation Coal Co. – Jenner | Pittsburgh Plate Glass Co. Tarentum |
| Consumers Gas Co. – Reading | Pittsburgh Plate Glass Co. Tipton |
| Consumers Light Co. – Plymouth | Pittsburgh Plate Glass Co. Works Ford City |
| Consumer’s Mining – Harmaville | Pittsburgh Plate Glass Glass Division Work No 6 Ford City |
| Consumers Power- J R Whitting Power Plant – Erie | Pittsburgh Plate Glass Glass Research Center Harmarville |
| Container Corp. of America Manayunk | Pittsburgh Plate Glass Paint Brush Division Springdale |
| Container Corp. of America Philadelphia | Pittsburgh Plate Glass PP & G Industries Creighton |
| Container Corp. of America Rencoyd | Pittsburgh Plumbing Dept Dock No 5 Pittsburgh |
| Container Division Aldan Borough | Pittsburgh Plumbing Shop |
| Contee Sand & Gravel Co. – Johnstown | Pittsburgh Post-Gazette |
| Continental Can Co. Mifflin | Pittsburgh Power Station – New Castle |
| Continental Can Co. Washington | Pittsburgh Powerhouse – Pittsburgh |
| Continental Diamond Fibre Diamond State Fibre Co. Bridgeport | Pittsburgh Press – Pittsburgh |
| Continental Distilling Corp. Philadelphia | Pittsburgh Provision & Packing Co. – Pittsburgh |
| Continental Foundry – Corapolis | Pittsburgh Public Safety Building |
| Continental Mills Inc – Philadelphia | Pittsburgh Public Theatre |
| Continental Oil Co. Chester | Pittsburgh Railways – Pittsburgh |
| Continental Rubber Works – Erie | Pittsburgh Railways Co. – Beaver Falls |
| Continental Wire & Cable – York | Pittsburgh Railways Co. Brunots Island Pittsburgh |
| Contract Server Trucking Co. Calmar | Pittsburgh Railways Co. Pittsburgh |
| Convalescent Home – Canonsburg | Pittsburgh Realty Co. Pittsburgh |
| Convalescent Home – New Castle | Pittsburgh Reduction Co. – New Kensington |
| Convent of Mercy Pittsburgh | Pittsburgh Reduction Co. – Pittsburgh |
| Convention Center – Philadelphia | Pittsburgh Rochester Coal Indiana |
| Coolbaugh – Philadelphia | Pittsburgh Screw & Bolt – Mt. Pleasant |
| Cooper Bessemer Plant – Grove City | Pittsburgh Screw & Bolt Co. Monaca |
| Cooper Energy Services – Grove City | Pittsburgh Screw Bolt – Mt. Pleasant |
| Cooper Hewitt Co. Durham Ironworks – Riegelsville | Pittsburgh Screw Bolt Co. Pittsburgh |
| Cooper Industries – Corry | Pittsburgh Seamless Tube Co. – Beaver Falls |
| Cooper Industries, Inc. – Canonsburg | Pittsburgh Shear Knife & Machine Co. – Pittsburgh |
| Cooperative Power Plant – Reading | Pittsburgh Sheet Metal – Connellsville |
| Coplay Cement Manufacturing Co. – Allentown | Pittsburgh Standard Conduit Enameled Metals – Etna |
| Coplay Cement Manufacturing Co. Coplay | Pittsburgh Steamship Co. – Pittsburgh |
| Coplay Cement Manufacturing Nazareth | Pittsburgh Steel – Charleroi |
| Copper Pittsburg Co. – Bridgeville | Pittsburgh Steel – Midland |
| Copper Range Co. – Leetsdale | Pittsburgh Steel Casting Co. – Pittsburgh |
| Copperweld Steel – Glassport | Pittsburgh Steel Co. Alicia |
| Copperweld Steel – McKeesport | Pittsburgh Steel Co. Allenport Plant Allenport |
| Copperweld Steel Rod & Wire Mill – Glassport | Pittsburgh Steel Co. Coke Plant Monessen |
| Coraopolis Ice Plants – Coraopolis | Pittsburgh Steel Co. McKees Rocks |
| Coraopolis Sewage Treatment Center – Coraopolis | Pittsburgh Steel Co. Monessen |
| Corbits, Inc. – Birdsboro | Pittsburgh Steel Corp. Pittsburgh |
| Corn & Corn Cob Products – Philadelphia | Pittsburgh Steel Foundry Co. – Glassport |
| Cornell Manufacturing Co. – Laceyville | Pittsburgh Steel Foundry Co. Pittsburgh |
| Corning Bradford | Pittsburgh Steel Midland |
| Corning Charleroi | Pittsburgh Steel Products Co. Allenport |
| Corning Glass – Bellefonte | Pittsburgh Street Railway Co |
| Corning Glass Co. Bellefonte | Pittsburgh Terminal Railroad & Coal Co. – Horning |
| Corning Glass Co. Bradford | Pittsburgh Terminal Warehouse & Transfer Co. – Pittsburgh |
| Corning Glass Co. Chambersburg | Pittsburgh Theological Seminary – Pittsburgh |
| Corning Glass Co. Charleroi | Pittsburgh Thermal – Pittsburgh |
| Corning Glass Co. Star Junction | Pittsburgh Thermal Limited Partnership – Pittsburgh |
| Corning Glass Plant – Pittsburgh | Pittsburgh Tool Steel Wire – Monaca |
| Corning Glass Works – Bradford Plant Bradford | Pittsburgh Tool Steel Wire Monaca |
| Corning Glass Works – State College | Pittsburgh Tube – Monaca |
| Corning Glass Works Charleroi | Pittsburgh University – Pittsburgh |
| Corning Glass Works Greencastle | Pittsburgh Valve & Fitting Co. – Pittsburgh |
| Cornwall Iron Co. – Cornwall | Pittsburgh Valve Foundry & Construction Co. – Pittsburgh |
| Cornwall Ore Bank Co. – Cornwall | Pittsburgh Wire Co. – Braddock |
| Coronada Apartments – Pittsburgh | Pittsburgh Wire Co. Pittsburgh |
| Corrigan- McKenney Steel Co. Sharpsville | Pittsburgh Works – Pittsburgh |
| Corrigan-McKenney Steel Co. – Black Lick | Pittsburgh Works Pittsburgh |
| Corry Railway Co. | Pittsburgh, Cincinnati, Chicago & St. Louis Railroad – Pittsburgh |
| Coudersport Junior & Senior High School – Coudersport | Pittsburgh, Cincinnati, Chicago & St. Louis RR Scully |
| Council Rock High School – Bucks County | Pittsburgh, Harmony, Butler & New Castle Railway Co. – Harmony |
| Country Belle Cooperative Pittsburgh | Pittsburgh lockhart Iron & Steel |
| Country Dry Wall – Wiliamsport | Pittston Coal Mining Co. – Sugar Notch |
| Country Home – Altoona | Plant Asbestos Co. – Pittsburgh |
| County Home – Somerset | Plant Slab Z Palmerton |
| Courtney Power Station – Monongahela | Plastics Division Kobuta Plant Kobuta |
| Cowan Shannock Coal & Coke Co. Yatesboro | Plaza Apartments – Philadelphia |
| Cowanshannock Coal & Coke Co. – Punxsutawney | Ple Railroad McKees Rock |
| Coxe Brothers & Co. – Deringer | Pleasant Hills Municipal – Pleasant Hills |
| Coxe Brothers & Co. Drifton | Plum Boro Schools – Plum Boro |
| Coxe Traveling Grate Co. – Port Carbon | Plum Boro Water Authority – Plum |
| Crafton Ice Co. – Crafton | Plumb Inc. Fayette R Philadelphia |
| Crafton Ingram Shopping Center – Crafton | Plymouth #5 Washery – Plymouth Junction |
| Cramp School – Philadelphia | Plymouth Coal Co. – Wilkes Barre |
| Cramp Shipbuilding Philadelphia | Plymouth Meeting |
| Cramp Shipyard Dravo Corp. Philadelphia | Plymouth Number 5 Washery Plymouth Junction |
| Cramps Shipbuilding Co. – Philadelphia | PNB – Oakland |
| Cranberry Lincoln Mercury – Cranberry | Pnb Building – Pittsburgh |
| Crane Co. Johnstown | Point Breeze Gas Works – Philadelphia |
| Crane Co. New Castle | Point Breeze Refinery – Philadelphia |
| Crane Co. Verona | Point Breeze Refinery Wax Plant Philadelphia |
| Crane Ironworks – Catasauqua | Point Breeze Slabbing Packaging Area Philadelphia |
| Crane Supply Co. – Pittsburgh | Point Marion Powerhouse – Point Marion |
| Creek Lane – Burgettstown | Pollock School – Philadelphia |
| CReminton Rand – Montgomery County | Pollock School Welsh Road Philadelphia |
| Crescent Forgings Co. – Pittsburgh | Poly Sar Aliquippa |
| Crescent Iron – Philadelphia | Polymer Corp. Reading |
| Crescent Mine – California | Polytechnic Institute Karachi |
| Crescent Portland Cement Co. – Cresentdale | Ponce De Leon Chester |
| Crescent Portland Cement Co. Wampum | Pope Tin Plate Co. – Pittsburgh |
| Crescent Works – Pittsburgh | Pope Tin Plate Co. Pittsburgh |
| Cresmer Fence Co. – Exton | Porcelain Products – Parkesburg |
| Cresson State College – Cresson | Port Authority Transit – South Hills |
| Cressona Aluminum – Cressona | Port Authority Transit View Garage – View |
| Crestview Gardens – New Castle | Port Cherry School – McDonald |
| Crichton Coal & Coke Co. Robinson | Port Cherry |
| Croft & Allen Co. – Philadelphia | Port Wentworth |
| Cromble Corp. Phoenixville | Portage Coal Mining Co. – Portage |
| Cromby Generating Station – Cromby | Portage High School – Portage |
| Cromby Station Philadelphia Electric Phoenixville | Porter Building – Pittsburgh |
| Crompton & Knowles – Gibraltor | Porter Co A K – Philadelphia |
| Crompton Knowles Gibraltar | Porter Co. H K – Philadelphia |
| Cross Brothers Meat 2nd Street Philadelphia | Portland Cement Co. Allentown |
| Cross Brothers Meat Packing – Philadelphia | Portland Generating Station Mt. Bethel |
| Cross Creek Coal Co. Deringer | Portland Generating Station Unit #1-2 Portland |
| Cross Creek Coal Co. Drifton | Portland Power Plant Upper Mount Bethel |
| Cross Creek Coal Co. Oneida | Portland Power Station – Portland |
| Crow Island Bof Monaca | Post Office – Philadelphia |
| Crown Associated Products Philadelphia | Post Office 30th Street Station Philadelphia |
| Crown Cork – Conchahaka | Potero John V Philadelphia |
| Crown Paperboard Co. – Philadelphia | Potlach Paper Mill – Lock Haven |
| Crown Products – Philadelphia | Potlach Paper Mill Lock Haven |
| Crown, Cork & Seal – Philadelphia | Potlatch – National Paper Co. – Ransom |
| Crozier Medical Center – Chester | Potomac Water Treatment & Power Plant – Philadelphia |
| Crucible Coal Co. Anensburg | Potter Sons & Co. – Philadelphia |
| Crucible Colt Industries Midland | Pottsgrove School – Pottstown |
| Crucible Steel Co. of America Aliquippa | Pottstown Hospital – Pottstown |
| Crucible Steel Co. of America Blair Station | Pottstown Plant – Pottstown |
| Crucible Steel Co. of America Clairton | Pottsville Area Middle School – Pottsville |
| Crucible Steel Co. of America Crescent Works Pittsburgh | Pottsville Bleach & Dye – Schuykill Haven |
| Crucible Steel Co. of America Lawrenceville | Pottsville Iron & Steel Co. – Pottsville |
| Crucible Steel Co. of America Midland | Pottsville Water Co. – Minersville |
| Crucible Steel Co. of America Oakdale | Pottsville Water Co. Pottsville |
| Crucible Steel Co. Station 301 Midland | Powelton Electric Co. – Philadelphia |
| Crucible Steel Plant – Midland | Powelton Gardens – Philadelphia |
| Crump, Inc. – Shippensburg | Power Atomic Power Station – Shippensburg |
| Crystal Ice Co. Inc. Allegheny City | Power Piping Co. – Clairton |
| Csx Transportation – Philadelphia | Power Piping Donora |
| Cudahy Packing Co. – Philadelphia | Power Piping Pittsburgh |
| Culp Industrial Insulation Co. – Kingston | Power Plant Wilkes Barre |
| Culp Industrial Insulation Co. Lock Haven | Power Systems Operations – Ebenburg |
| Cumberland Light, Heat & Power Co. – Bridgeport | Powerhouse – Butler |
| Cumberland Valley Division of Pennsylvania Railroad Co. – Chambersburg | Powerhouse Milesburg |
| Curry H R Co. Inc – Pittsburgh | Powerhouse Shawville |
| Curtin Elementary School – Altoona | Powers Weightman Rosengarten Co. – Philadelphia |
| Curtis Publishing Co. – Philadelphia | PP & G Industries Allison Park |
| Curtis Publishing Co. Sharon Hill | PP & G Industries Carlisle |
| Curtis Publishing House – Sharon | PP & G Industries Creighton |
| Curtis- Wright Corp. Propeller Division Beaver | PP & G Industries Ford City |
| Curtis-Wright Corp. – Beaver | PP & G Industries Greensburg |
| Custom Carpet – Washington | PP & G Industries Harmar Township |
| Custom Insulation Co. – York | PP & G Industries Harmarville |
| CW & Heating – Ellwood City | PP & G Industries Jeannette |
| CW Plumbing & Heating – Ellwood City | PP & G Industries Kent |
| CW Plumbing Heating – Ellwood City | PP & G Industries Meadville |
| Cyclops Chemical Plant – Bridgeville | PP & G Industries Mt. Holly |
| Cytemp Specialty Steel – Titusville | PP & G Industries Pittsburgh |
| D & D Bowling Alley – New Castle | PP & G Industries Springdale |
| D Oher Engr. Co. – Philadelphia | PP & G Industries Tipton |
| D. B. Fuller – Philadelphia | PP & G Pittsburg Plate Glass Harmarville |
| D. L. Clark Co. Allegheny | Pp& L Powerhouse – Washington |
| D. L. Molden & Brother – Philadelphia | Ppg Industries – Carlisle |
| D. L. Molden & Brother Philadelphia | Ppg World Headquarters Building |
| D. Lutz Son Brewing Co. Allegheny City | PPG World Headquarters Building – Pittsburgh |
| D. M. Bare Paper Co. – Roaring Springs | PPL Brunner Island Steam Electric Station Unit 3 York Haven |
| D. M. Trahan Proj Supt Homer City | Ppl Electric Utilities Corp – Allentown |
| D. O. E – Bruceton | Pram Co. – Wilmerding |
| D. Oher Engineering Co. – Philadelphia | Precise Plastics – Erie |
| D. R. Bendix Co. Pittsburgh | Precision Grinding Co. – Philadelphia |
| D. R. Lane – Pittsburgh | Precision Grinding Wheel – Philadelphia |
| D. S. Keith Junior High School – Altoona | Precision Heat Treatment South Hampton |
| D. T. Watson Home – Sewickley | Precision Products Co. – Washington |
| D. Trainer & Sons – Linwood | Precision Tool & Die – Butler |
| Dager & Cox, Eureka Paper Mills – Bridgeport | Premier Sugar Mill & Distillery Co. Ltd Mardan |
| Dahlgren – Philadelphia | Presbyterian Church – Bradford |
| Dail Rock Coal Co. – Wyoming | Presbyterian Church – PA |
| Dale Boring Tire Shop – Johnstown | Presbyterian Home For Widows & Single Women – Philadelphia |
| Dally Engineering Valve Co. Pittsburgh | Presbyterian Hospital – Philadelphia |
| Dam – Brownsville | Prescotech – Erie |
| Damascus- Bishop Tube Co. – Greenville | Presque Isle Boiler – Erie |
| Damascus Nickel Steel Co. – Carnegie | Presque Isle Paper Co. – Erie |
| Damascus Steel – Munhall | Pressed Steel Car Co. Allegheny |
| Dambrosio Clothing Philadelphia | Pressed Steel Car Co. McKees Rocks |
| Dana Corp. – Reading | Pressed Steel Car Co. Pittsburgh |
| Dana Corp. Parish Frame Division – Reading | Prestolite Battery – Reading |
| Daniel J. Keating – Philadelphia | Price Battery Corp. – Hamburg |
| Danlevy Packing Co. – Liberty | Price H C & Co. – Philadelphia |
| Danville & Sunbury Street Railway Co. – Danville | Pride Chester |
| Danville Powerhouse | Prime Manufacturers – Springdale |
| Danville Powerhouse Washingtonville | Primrose Colliery – Mahanoy City |
| Danville State Hospital – Danville | Princess Furnace Co. – Glen Wilton |
| Danville Stove & Manufacturing Co. – Danville | Printing Press – Minersville |
| Danville Structural Tubing Co. – Danville | Prison- Men’s House Of Detention – Philadelphia |
| Danville Water Works – Danville | Procter & Gamble – Tunkhannock |
| Darby Paper Co. – Darby | Procter & Gamble Co. Mehoopany |
| Daring Paper Co. – Bridgeport | Procter & Gamble Tunkhannock |
| Daring Paper Co. Downingtown | Proctor & Gamble Mehopany |
| Darlington Building – Philadelphia | Proctor & Schwartz Inc. Philadelphia |
| Daugherty Refinery Division Dept A Petrolia | Proctor Ellison Co. – Elkland |
| Dauphin County Prison – Harrisburg | Proctor Swartz Philadelphia |
| Davis Hospital – Clarksburg | Progress Manufacturing Philadelphia |
| Davison Coke & Iron Co. – Nequehoning | Progressive Manufacturing Co. – Philadelphia |
| Davison Coke & Iron Co. – Neville Island | Projectile Plant #2 Army Gun Carriago Shop – S. Bethlehem |
| Davy McKee Corp. Pittsburgh | Prospect Colliery – Wilkes Barre |
| Day & Zimmerman – Coatesville | Providence – Primrose |
| Days Inn – Bristol | Providence Hospital – Beaver Falls |
| DE Lackawanna & Western RR Co. Diamond Mines Scranton | Prudential Insurance Building – Upper Dublin |
| De Witt P Henry Co. – Philadelphia | PS 321 William Penn, 180 Seventh Ave. Brooklyn, NY |
| Dearth Mines | Pt. Richmond Philadelphia |
| Decamos Corp. – Pittsburgh | Pubicker Industries – Philadelphia |
| Decker Sq Stack Job – Bala Cynwyd | Public Debt Building – Parkersburg, WV |
| Decorating & Display Studio – Lancaster | Public Ledger Building – Philadelphia |
| Deemston Boro | Public School – Philadelphia |
| Defense Plant Corp – Philadelphia | Public Service Corp. of New Jersey Philadelphia |
| Defense Supply Agency – Philadelphia | Public Service Gas Co. – Philadelphia |
| Degol Brothers – Gallitzin | Publicker Chemical Plant Station 1 Philadelphia |
| Delancy School – Philadelphia | Publicker Commercial Alcohol Co. – Cornwell Heights |
| Delaware & Hudson Canal Co. Wilkes Barre | Publicker Industries Chemical Plant Station 1 Philadelphia |
| Delaware & Hudson Co. Archibald | Publicker Industries South Philadelphia |
| Delaware & Hudson Co. Carbondale | Publicker Industries, Distillers – Philadelphia |
| Delaware & Hudson Co. Hudson | Publicker Industries, Inc. – Philadelphia |
| Delaware & Hudson Co. Olyphant | Publickers Distillery – Philadelphia |
| Delaware & Hudson Co. Parsons | Publiker Industries – Philadelphia |
| Delaware & Hudson Co. Plymouth Junction | Pullman Co. – Pullman |
| Delaware & Hudson Co. Providence | Pullman Standard Car Manufacturing Co. – Butler |
| Delaware & Hudson Co. Scranton | Pullman Standard Plant – Butler |
| Delaware & Hudson Co. Wilkes Barre | Pumping Station – Ford City |
| Delaware & Hudson Coal Handling Plant Carbondale | Pumping Station – Reading |
| Delaware & Magnetic Springs Railway Co. – Pittsburgh | Pumping Station-Landers Point Landers Point |
| Delaware Alloy Forge – Philadelphia | Punxsutawney Elementary School – Punxsutawney |
| Delaware Asbestos – Philadelphia | Punxsutawney Hardware – Punxsutawney |
| Delaware Co. Memorial Hospital – Drexal Hill | Punxsutawney Iron Co. – Punxsutawney |
| Delaware Corp. Pennsylvania Corp. | Punxsutawney Secondary School – Punxsutawney |
| Delaware County & Philadelphia Electric Railway Co. – Clifton Heights | Purchase Line School – Mahaffey |
| Delaware County Central Heating Co. – Springfield | Purchasing Department – 3 Gateway Center – Pittsburgh |
| Delaware County Courthouse – Media | Purchasing Department – Pittsburgh |
| Delaware County Electric Co. – Chester | Purchasing Department 3 Gateway Center Pittsburgh |
| Delaware County Hospital Delaware County | Pure Oil Co. Maple Glen |
| Delaware County Incinerator Chester | Pure Oil Co. Marcus Hook |
| Delaware County Prison – Thornton | Purex Corp. – Bristol |
| Delaware County Prison Delaware County | Pusey & Jones Shipbuilding Co. – Wilmington |
| Delaware Generating Station Philadelphia | Pyne Colly – Pyne Colly |
| Delaware Insulation Co. – Lester | Pyne Colly Taylor |
| Delaware Lackawanna & Western Railroad Co. Plymouth | Pyrotek – Carlisle |
| Delaware Lackawanna & Western Railroad Co. Scranton | Quaker Boiler Repairing Co. – Philadelphia |
| Delaware Mine – Hudson | Quaker Chemical Corp. – Connellsville |
| Delaware Power & Light Co. – Edge Moor | Quaker City Chocolate Co. – Philadelphia |
| Delaware River Cordage Mill – Philadelphia | Quaker City Dye Works – Philadelphia |
| Delaware River Steel Co. – Chester | Quaker City Ironworks – Philadelphia |
| Delaware Rubber Co. Philadelphia | Quaker City Rubber Co. Wissinoming |
| Delaware Ship Supply Co. Philadelphia | Quaker Export Packaging Co. Inc. – Philadelphia |
| Delaware Station – Philadelphia | Quaker Markets – Altoona |
| Delaware Storage & Freezing Co. – Philadelphia | Quaker Oats Co. – Shiremanstown |
| Delaware Valley Drywall – Croyden | Quaker Rubber Co. Philadelphia |
| Delaware Valley Hospital – Langehorne | Quaker State – Parkersburg, WV |
| Delaware Waterside Station – Philadelphia | Quaker State Machine Co. – Willow Grove |
| Delaware Works Marcus Hook | Quaker State Metals Inc. Manehim Pike Lancaster |
| Delaware, Lackawanna & Western Railroad Co. Kingston | Quaker State Oil Refinery Co. Emlenton |
| Delaware, Lackawanna & Western Railroad Co. Nanticoke | Quaker State Oil Refinery Co. Farmers Valley |
| Delaware, Lackawanna & Western Railroad Co. Plymouth | Quaker State Oil Refinery Co. Oil City |
| Delaware, Lackawanna & Western Railroad Co. Scranton | Quaker State Oil Refinery Co. Smethport |
| Delaware, Lackawanna & Western Railroad Co. Taylor | Quaker State Oil Refining Co. Mckean Plant Farmers Valley |
| Dell’s Restaurant Pittsburgh | Quaker State Service Station – Brady |
| Delmont Builder Supply – Delmont | Quakertown Brick & Tile Co – Quakertown |
| Delta Ecuador – Chester | Quakertown Chrysler Plymouth – Quakertown |
| Delta Equipment Co. – Philadelphia | Quakertown Electric Department – Quakertown |
| Delta Finishing Co. – Philadelphia | Quakertown Tractor Co. – Quakertown |
| Delworth Paper Co. – New Castle | Quality Markets – Titusville |
| Demoin Steel – Pittsburgh | Queen City Cleaners Aliquippa |
| Dent – Philadelphia | Quickway Inc. Philadelphia |
| Dent Plumbing & Heating, Inc. – Light Street | Quin- T Corp. Erie |
| Dent Plumbing Heating, Inc. Light Street | Quin-T Corp. – Erie |
| Depaco Paper Co. – Downington | Quint Corp. Erie |
| Department Of Motor Vehicles Building – Harrisburg | Quonset Point- Paulson Lab |
| Department Of Public Welfare – Pennhurst State School – Spring City | R & J Supply Co. – Erie |
| Department Of Safety – Philadelphia | R & J Supply Co. |
| Department Of the Interior, Bureau Of Mines – Pittsburgh | R & P Coal Co. – Ernes |
| Dept. of Justice Ins. Store Room | R. & H. Simon – Easton |
| Dept. of Public Instruction | R. A. Duckworth, P. G. H. Steamline Philadelphia |
| Dequesne Light Co. 30th St. Station Pittsburgh | R. B. Murray Oakland Arcade Co. – Pittsburgh |
| Des Moines Iron Pittsburgh | R. C. A. Victor – Lancaster |
| Des Moines Steel – Pittsburgh | R. C. Can Canning Plant – Bradford |
| Design Techniques – Stroudsburg | R. C. Remmey Division – Philadelphia |
| Desuperheater Station – Reducing Station – McKees Rocks | R. D. Harrer Construction Mount Pleasant |
| Detroit Edison Pennsalt Power Plant | R. D. Isaacs & Son – Wilkes Barre |
| Detroit Pennsylvania Salt Mill | R. D. Werner Co. – Greensburg |
| Detroit Steel Products Co. – Erie | R. D. Wood – Philadelphia |
| Detroit Steel Products Elizabeth | R. D. Wood Building – Philadelphia |
| Deval Corp. – Philadelphia | R. D. Wood Philadelphia |
| Dewart Milk Products Co. – Trout Run | R. E. A. Shop – Hollidaysburg |
| Dewitt P. Henry Candy Co. Philadelphia | R. G. Peiliker Applied Research Laboratory Monroeville |
| Dexter Portland Cement Co. – Nazareth | R. H. Hickman Co. – McKees Rocks |
| Dexter Portland Cement Co. Siegfried | R. Heckscher & Sons – Swedeland |
| Diamond Alkali Co. – Pittsburgh | R. Hecksher & Sons – Philadelphia |
| Diamond Bowling Lanes – New Castle | R. J. Carey Co. – Wiliamsport |
| Diamond Drill Machine Co. – Birdsboro | R. J. Carey Co. Williamsport |
| Diamond Mines – Scranton | R. J. Supply Co. Erie |
| Diamond National Bank Building – Pittsburgh | R. K. Laros Silk Co. – Bethlehem |
| Dickinson School Of Law – Carlisle | R. L. Miller Enola |
| Dickson Mine, Green Ridge Station – Scranton | R. M. Armstrong – Chester |
| Dickson School – Swissvale | R. M. Steel Carnegie |
| Didier Station – Bethlehem | R. O. Werner Co. Greenville |
| Dietz Trucking Co. – Pittsburgh | R. R. Shops – McKees Rocks |
| Dill & Collins Co. Philadelphia | R. Shafer Supt. – Cornwell Heights |
| Dillingers Distilleries, Inc. – Ruffs Dale | R.A. Duckworth, P.G.H. Steamline – Philadelphia |
| Dilworth Porter & Co. Limited Pittsburgh | Racoon State Park Dept of Property Supply Project Pittsburgh |
| Dilworth Porter Co. – Pittsburgh | Racquet Club Apartments – Levittown |
| Dining Hall, State Correctional Institution Cambridge Springs | Racquet Club Apartments – Monreoville |
| Directors Of the Poor Of Allegheny County – Woodville | Radi S Auto Wrecking Pittsburgh |
| DisCo. Plant – Imperial | Radiant Steel Products Co. Williamsport |
| Dispatch Publishing Co. – Pittsburgh | Radio Co. of America |
| Diversitech General – Jeannette | Radio Company of America Dunmore |
| Dixie Cup Easton | Radio Corp. of America Tube Division Lancaster |
| Dixie Cup Plant – Easton | Radio Corp. of America-RCA Lancaster |
| Dixmont Hospital for The Insane – Dixmont | Radio Parts – Liberty |
| Dixmont State Hospital – Sewickley | Radnor – Quarryville |
| Dixon Valve & Coupling Co. Philadelphia | Raido Corp Of America – RCA – Lancaster |
| Dl Molden & Bro. – Philadelphia | Railroad Penn Station |
| Dna Auto Auction – New Stanton | Railway Specialties – Bristol |
| Dock Street Plant – Easton | Railway Specialties Corp. Groyden |
| Dodge & Day Nicetown, Philadelphia | Railway Spring & Manufacturing Co. – Pittsburgh |
| Dodge Mines – Scranton | Railway Steel Spring Co. – Latrobe |
| Dodge Steel Co. – Philadelphia | Rainey Wood Coke Co. – Swedeland |
| Dodson Mines, Plymouth Coal Co. – Plymouth | Ramada Inn – Brookville |
| Doe Bruceton | Ramsey Hardware & Paneling Co. – New Castle |
| Doehler Jarvis Division, National Lead Industries, Inc. – Pottstown | Rankin Station – Pittsburgh |
| D’Olier Engineering Co. – Philadelphia | Rankin US Steel Carrie Furnace |
| Dollar General – White Oak | Rankin Works #2 Turbo Blower Rankin Mill Rankin |
| Dolonite Brick Corp. of America York | Ransom Hospital – Ransom |
| Dolph Coal Co. Dunmore | Rapid Transit Street Railway Co. |
| Dolph Coal Co. Pickville | Raub Supply Lancaster |
| Dolph Coal Co. Scranton | Ravensburg Bridge – Clairton |
| Dolph Coal Co. Winton | Raybestos-Manhattan Co. Manheim |
| Domino Sugar Philadelphia | Raybestos-Manhattan Plant Manheim |
| Domino Sugar Refinery – Philadelphia | Rayburn Steel – Rayburn |
| Don Sotero Escarza – Ingo Portugalete | Raymark Co. Manheim |
| Donahue & Weber Construction Co. – Philadelphia | Raystown Water Power Co. – Clover Creek |
| Donaldson Iron Co. – Emmaus | Raystown Water Power Co. – Huntington |
| Donegon School – Bethlehem | RCA – Canonsburg |
| Donora Brewing Co. – Donora | RCA – Lancaster |
| Donora Brewing Co. – Pennsylvania | RCA – Mountaintop |
| Donora Zinc Works – Donora | RCA – Scranton |
| Donovan Cement – Philadelphia | RCA Building Sayre |
| Donovan Co. – Philadelphia | RCA Corp. Lancaster |
| Donovan Excavating – Titusville | RCA Dunmore |
| Dorchester Apartments – Plymouth Meeting | Rca Plant – Dunmore |
| Dormont Oldsmobile – Dormont | RCA Plant – Lancaster |
| Dorr Oliver, Inc. – Hazleton | RCA Tube Div. Color Slurry Iv Lancaster |
| Dorr-Oliver Inc. Spring Grove | RCA Victor Division Buildings #2, 2A 2B Lancaster |
| Double Woven Corp. – Scranton | RCA Victor Division Manufacturing Plant Lancaster |
| Double Woven Corp. Of America – Dunmore | RCA Victor Lancaster |
| Dougherty Bachran – Philadelphia | RCA. Building – Sayre |
| Downey Center Mayview State Hospital – Bridgeville | RCA. Victor – Lancaster |
| Downingtown Paper | Reacing Railroad Co. Philadelphia |
| Downingtown Paper- Downington | Read & Lovatt Manufacturing Co. Weatherby |
| Downingtown Water Pollution Downingtown | Reading Co. Philadelphia |
| Downtown Station – Pittsburgh | Reading Gray Iron Casting, Inc. Reading |
| Dowty Corp. – Zeleinople | Reading Iron Co. Danville |
| Doyle & Co. – Philadelphia | Reading Iron Co. Emaus |
| Doylestown & Easton Street Railway Co. – Doylestown | Reading Iron Co. Reading |
| Doylestown & Willow Grove Railway Co. – Philadelphia | Reading Iron Co. Tube Works Reading |
| Dr W A Drysdale – Philadelphia | Reading Ironworks – Reading |
| Dr. Lawrence Siegel’s Residence – Yardley | Reading Metals Refining Co. – Reading |
| Dr. W.A. Drysdale – Philadelphia | Reading Railroad Co. King of Prussia |
| Drake Hotel – Philadelphia | Reading Railroad Co. Philadelphia |
| Draper & Yost, Inc. – Tamaqua | Reading Railroad Co. Reading |
| Dravo – Brackenridge | Reading Railroad Shops |
| Dravo Contracting Co. – Pittsburgh | Reading Rehabilitation Hospital – Reading |
| Dravo Corp. Neville Island | Reading Shale Brick Co. – Reading |
| Dravo Corp. New Brighton | Reading Steel Foundry – Reading |
| Dravo Corp. Philadelphia | Reading Transport – Reading |
| Dravo Corp. Pittsburgh | Reading Transportation Plymouth Meeting |
| Dravo Doyle Co. – Pittsburgh | Reading Tube Corp. Reading |
| Dravo Ship Corp. – Pittsburgh | Reading Tube Division – Reading |
| Dravo Shipbuilding – Nequehoning | Reading Water Works – Reading |
| Dravo Shipbuilding Neville Island | Reading Whitehall Paperboard – Reading |
| Dravo Shipbuilding Pittsburgh | Real Estate Trust Building Philadelphia |
| Dravo Shipyard – Morton | Real Estate Trust Office Building – Philadelphia |
| Dravo Shipyards, Neville Island | Recreation Hall – State College |
| Dredge Philadelphia – Chester | Red Lion High School Red Lion |
| Dresser Industries, Inc. Pittsburgh | Red Lion Plant – Philadelphia |
| Dresser Manufacturing Division – Bradford | Red Rock Air Base – Red Rock |
| Dresser Manufacturing Wellsboro | Redington Standard Fittings Co. – Redington |
| Drever Co. Building # 1 & #2 Bethayres | Reed Danville State – Danville |
| Drexel Institute – Philadelphia | Reed Electric Co. – Philadelphia |
| Drexel University – Philadelphia | Reed, Danville State Hospital Danville |
| Driggs Seabury Ordnance Co. – Sharon | Reedsdale Power Station Power Station – Kittanning |
| Drunner Island Station York Haven | Reedsville Power Station – Kittanning |
| Dubois Electric & Traction Co. – Dubois | Reese Metal Products Corp – Lancaster |
| Dubois Hospital – Dubois | Reese Miller Plastering – Pittsburgh |
| Dubois Library – Dubois | Refinery Indianola |
| Dubois Mall – Dubois | Refractory & Insulation Plant – Port Kennedy |
| Dubois Regional Medical Center – Dubois | Refractory Insulation Corp. Port Kennedy |
| Duer Spring & Manufacturing Co. Div. McKees Rocks | Refractory Specialties Sales Co. Morristown |
| Duff Manufacturing Co. – Pittsburgh | Rehabilitation Center – Johnstown |
| Duff Norton Manufacturing Co. – Pittsburgh | Reichard Coulston Co. Bethlehem |
| Duff-Norton Manufacturing Co. – Pittsburgh | Reichard-Coulston Inc. – Philadelphia |
| Duggan & Marcon, Inc. – Allentown | Reider Brothers – Philadelphia |
| Duguesna Light Co. – Pittsburgh | Reigner & Engle Brewing Co. – Philadelphia |
| Dunbar Furnace Co. – Dunbar | Reiners – Pittsburgh |
| Duncan & Miller Glass Plant – Washington | Reisinger Prather Co. – Pittsburgh |
| Dunham-Bush – Harrisburg | Reitz Tool – Cochranton |
| Dunlevy & Brother Co. – Liberty | Reliable Luggage – New Castle |
| Dunmore Iron & Steel Co. – Dunmore | Reliance Cement Co. Coplay |
| Duplan Corp. – Hazleton | Reliance Coke Co. – Denbeau |
| Duplan Silk Corp – Hazleton | Reliant Energy Mid Atlantic – Johnstown |
| Dupont Chemical – Kettett Square | Reliant Energy Mid Atlantic Johnstown |
| Dupont De Nemours Co. – Philadelphia | Reliant Energy Wholesale Group – New Florence |
| Duquesne Brewing Bottling House Pittsburgh | Reliant Energy Wholesale Group Shawville |
| Duquesne Brewing Co. Bottling House Pittsburgh | Remington- Rand Inc. – Philadelphia |
| Duquesne Brewing Co. McKees Rocks | Remington Rand Inc. Montgomery County |
| Duquesne Brewing Co. Pennsylvania | Reminton Rand |
| Duquesne Brewing Co. Pittsburgh | Remmey Division Philadelphia |
| Duquesne Forge Co. – Pittsburgh | Remmey Donald B Wood Prod Southampton |
| Duquesne Forge Co. Rankin | Remmey Refractories – Philadelphia |
| Duquesne Ice Co. – Pittsburgh | Remmey Refractory – Philadelphia |
| Duquesne Incinerator – Duquesne | Remmy Division A P Green – Philadelphia |
| Duquesne Light – Crescent Township | Rennepamp Supply Co. – Pittsburgh |
| Duquesne Light – Springdale | Renovo Shops – Renovo |
| Duquesne Light Co- Central Str Pittsburgh | Republic Aluminum – Beaver Falls |
| Duquesne Light Co. #1 Shippingport | Republic Coke Works – Republic |
| Duquesne Light Co. 13th St. Station Pittsburgh | Republic Coke Works Republic, Fayette County |
| Duquesne Light Co. 20th Station Pittsburgh | Republic Heater Co. – Erie |
| Duquesne Light Co. 30th St. Station Pittsburgh | Republic Heater Co. Erie |
| Duquesne Light Co. B Station Storeroom Pittsburgh | Republic Housing – Republic |
| Duquesne Light Co. Brunners Island | Republic Iron & Steel Co. – New Salem |
| Duquesne Light Co. Brunot Island Generating Station Storeroom Pittsburgh | Republic Iron & Steel Co. New Salem |
| Duquesne Light Co. Brunots Island Pittsburgh | Republic Iron & Steel Co. Pittsburgh |
| Duquesne Light Co. Cheswick #1 Springdale | Republic Iron & Steel Co. Sharon |
| Duquesne Light Co. Cheswick Power Station Springdale | Republic Ironworks Pittsburgh |
| Duquesne Light Co. Cheswick Station Cheswick | Republic Steel Corp. Beaver Falls |
| Duquesne Light Co. Cycle Plant Pittsburgh | Republic Steel Corp. New Brighton |
| Duquesne Light Co. Elrama Power Plant Storeroom Elrama | Republic Steel Corp. Newton |
| Duquesne Light Co. Elrama Power Station Jefferson Hills | Research & Development Building |
| Duquesne Light Co. Frank R. Phillips Power Station Cheswick | Research & Development Center – Lancaster |
| Duquesne Light Co. Glenwood Station Pittsburgh | Research Development Center Fire Test Room Lancaster |
| Duquesne Light Co. James H. Reed Power Station Pittsburgh | Research Development Ctr. Bldg. 4, 11, 12,15 Lancaster |
| Duquesne Light Co. Nuclear Power Station Shippingport | Research Div. – Pilot Plant- Station 73 – Pittsburgh |
| Duquesne Light Co. Phillips Power Plant Storeroom Wireton | Residential Homes – Hawthorne |
| Duquesne Light Co. Phillips Power Station South Heights | Rest Haven County Nursing Home – Schuykill Haven |
| Duquesne Light Co. Phipps Power Plant Pittsburgh | Retreat State Hospital – Hunlock Creek |
| Duquesne Light Co. Pittsburgh | Revonah Yarn Mills – Hanover |
| Duquesne Light Co. Rankin | Rex Hide Rubber Co. – Brady |
| Duquesne Light Co. Springdale | Reynold Machine – Midvale |
| Duquesne Light Power – Pittsburgh | Reynolds Manufacturing Co. – Avonmore |
| Duquesne Light South Heights Power Station – South Heights | Reynolds Manufacturing Plant – Avonmore |
| Duquesne Power Plant – Aliquippa | Reynolds Metals Co. Aluminum Plant Chester |
| Duquesne Slag Products – Mifflin | Rezner Heathers – Grove City |
| Duquesne Station Co. Pittsburgh | Rfg 1 Rfd Nbr 1 Pen Argyl |
| Duquesne Steel Co. – Cochran Station | Rhind Philadelphia |
| Duquesne Steel Works – Duquesne | Rhodia, Inc. Morrisville |
| Duquesne Works – Duquesne | Rhone Poulenc Rorer Inc. – Collegeville |
| Duquesne Works Oxygen Plant, Pump House Duquesne | Rich- Sampliner Knitting Mills Co. Conshohocken |
| Duquesne Works Oxygen Plant, RIver Pump House Duquesne | Richard Finishing Co. Inc. – Jerwyn |
| Duquesne Works Steel Works Duquesne | Richard Heckscher & Sons Swedeland |
| Duraloy Co. – Scottsdale | Richardson Paint Co. – Philadelphia |
| Durham Public School – Philadelphia | Richland Isd – Richland |
| Dutton Place Apartments Folsom | Richland Mall – Johnstown |
| Dutton Place Apts – Folsom | Richland School District – Johnstown |
| Dutton Place Apts Folsom | Richland Senior High School – Johnstown |
| Dyamite Noble Mountain Top Industrial Park – Mountain Top | Richland Shopping Center – Johnstown |
| Dynamet Corp. Washington | Richmond Generating Station Philadelphia |
| Dynamic Metal Forming, Inc. – Koppel | Richmond Power Plant – Philadelphia |
| Dynamite Noble Mountain Top Ind Park – Mountain Top | Richmond Radiator Co. – Uniontown |
| Dyna-Vac Power Cleaning of Buxmont Doylestown | Richmond Station Crude Oil Facility Philadelphia |
| E Bergendahl Co. Philadelphia | Richmond Works – Philadelphia |
| E Liberty Home Dressed Meat Co. – Pittsburgh | Rich-Sampliner Knitting Mills Co. – Connellsville |
| E Thompson Works Braddock | Rico Realty Co. – Philadelphia |
| E. & G. Brooke Iron Co. – Birdsboro | Ridc Park – Blawnox |
| E. B. Leaf Co. – Philadelphia | Ridc Park – Findlay Township |
| E. Bergendahl – Philadelphia | Riddle Memorial Hospital – Media |
| E. C. Knight & Co. – Philadelphia | Ridge Equipment Co. – Fallen Timber |
| E. D. Transfer – New Castle | Ridge per Products |
| E. E. Austin Shipyards – Erie | Ridgeway High School – Ridgeway |
| E. F. Houghton & Co. – Philadelphia | Ridley Township – Reading |
| E. G. Brooke Iron Co. Birdsboro | Rieck Mcjunkin Dairy Co. – Pittsburgh |
| E. G. Brooke Iron Co. St. Peters | Rigg & Reel – Parkersburg, WV |
| E. G. Budd Co. – Philadelphia | Riggs Distiller & Co. – Lancaster |
| E. G. Budd Co. Philadelphia | Riggs Distiller Co. Lancaster |
| E. H. Aldrich Treatment Complex Elrama | Riggs, Distler & Co. – North Wales |
| E. I. Dupont De Nemours & Co. Cornwellis Heights | Rilet Stocker Corp. – Philadelphia |
| E. I. Dupont De Nemours & Co. Gibbstown | Riley Stoker – Cornwell Heights |
| E. I. Dupont De Nemours & Co. Hazelton | Riley Stoker Corp. – Philadelphia |
| E. I. Dupont De Nemours & Co. Philadelphia | Rimersburg Jr. – High School Rimersburg |
| E. I. Dupont De Nemours & Co. Towanda | Rimersburg Junior High School – Rimersburg |
| E. I. Dupont De Nemours & Co. Twin Oaks | Ringtown Elementary School – Ringtown |
| E. I. Dupont De Nemours & Co. Washington | Riter Conley Manufacturing Co. – Pittsburgh |
| E. I. Weigland – Pittsburgh | Rittenhouse Apartments – Philadelphia |
| E. J. Lavino & Co. Marietta | Rittenhouse C & Son – Quakertown |
| E. J. Lavino & Co. Sheridan | Rittenhouse Plaza – Philadelphia |
| E. J. Lavino Co. Philadelphia | Rittman Process Corp – Pittsburgh |
| E. J. Lavino Co. Plymouth Meeting | Ritz Carlton Hotel – Philadelphia |
| E. J. Lavino Co. Sheridan | RIver Pump House Duquesne |
| E. J. Lavion & Co. – Marietta | River Toad – McKees Rocks |
| E. Keeler Co. Williamsport | Riverside Tool & Dye – Latrobe |
| E. L Rothschild Building – Philadelphia | Riverview High School – Oakmont |
| E. L. Rothschild Building – Philadelphia | Riverview Home For The Aged – Philadelphia |
| E. L. Rothschild Building Philadelphia | Rl Miller – Enola |
| E. L. Weigland – Pittsburgh | Roadway Express Camp Hill |
| E. M & W Ferguson – Pittsburgh | Roadway Express Harrisburg |
| E. M. & W. Ferguson – Pittsburgh | Roaring Spring Paper Mill – Roaring Springs |
| E. M. & W. Ferguson Pittsburgh | Roaring Springs Paper Mill – Hollidaysburg |
| E. N. Hyde Heating Co. – Pittsburgh | Roaring Springs Power Station – Roaring Springs |
| E. N. Hyde Heating Co. Pittsburgh | Robert Chambers, Inc. Pittsburgh |
| E. S. Atkinson – Erie | Robert H. Foerderer Philadelphia |
| E. S. Atkinson Erie | Robert Packer Hospital – Sayre |
| E. S. Fox Div. Northeastern Lumber Co. Reading | Robert S McQueen Philadelphia |
| E. T. Edwards – Columbia | Robert Smith Ale Brewing Co. – Philadelphia |
| E. T. Edwards Columbia | Robert Welch Trucking White Mills |
| E. T. Stotesbury Residence – Philadelphia | Robert Wooler Co. – Dressher |
| E. W. Bliss – Midland | Robertshaw Controls – New Stanton |
| E. W. Bliss Co. Midland | Robertshaw Controls – Youngwood |
| E. W. Bliss CO. Pittsburgh | Robertson- American Corp. A Morrisville |
| Eager Beaver Lumber Yard – Townsville | Robertson Fuel Oil – Linwood |
| Eagle Hill Colliery – Port Carbon | Robesonia Iron Co. Limited – Robesonia |
| Eagles Club – Franklin | Robesonia Iron Co. Limited Robesonia, Berks County |
| Earbeu Harding & Co. – Philadelphia | Robesonia Iron Co. Robesonia |
| Eastern Affiliated Services Corp. – Easton | Robina Mine – Fordyce |
| Eastern Affiliated Services Corp. | Robindale Near Seward |
| Eastern Asphalt Co. – Philadelphia | Robinson & Rea Manufacturing Co. – Pittsburgh |
| Eastern Foundry Co. – Boyertown | Robinson & Wallace – Philadelphia |
| Eastern Foundry Co. Hovertown | Robinson Clay Products Co. – Pottstown |
| Eastern Gunite Corp. – Bala Cynwyd | Robinson Industries – Zelienople |
| Eastern Hydraulic Press Brick Co. – Philadelphia | Robinson Protected Metal Co. – Ceiling – Pittsburgh |
| Eastern Industrial Insulation – Allentown | Robinson Ventilating Co. – Zeleinople |
| Eastern Industrial Insulation Co. – Reading | Robinson Wall Covering – Titusville |
| Eastern Mercy Health Systems – Pittsburgh | Roch Pittsburgh Coal Homer City |
| Eastern Penn Psychiatric Institute – Philadelphia | Rochester & Pittsburgh Coal & Iron Co. Dubois |
| Eastern Pennsylvania Power Co. – Easton | Rochester & Pittsburgh Coal & Iron Co. Eleanor Shaft Mine |
| Eastern Pennsylvania Railways Co. – Palo Alto | Rochester & Pittsburgh Coal & Iron Co. Falls Creek |
| Eastern Pennsylvania Railways Co. Pottsville | Rochester & Pittsburgh Coal & Iron Co. Helvetia |
| Eastern Star Home – Bellevue | Rochester & Pittsburgh Coal & Iron Co. Lucerne |
| Eastern State School – Langehorne | Rochester & Pittsburgh Coal & Iron Co. Punxsutawney |
| Eastern Steel Co. – Pottsville | Rochester General Hospital – Rochester |
| Eastern Westmoreland Vo Tech – Westmoreland | Rochester High School Rochester |
| Easton Gas & Electric Co. – Easton | Rochester Pittsburgh Coal Co. Indiana |
| Easton High School – Easton | Rochester Pittsburgh Coal Indiana County |
| Easton Hospital Easton | Rochester Plant – Rochester |
| Easton Shopping Center – Easton | Rochester Power Plant Lucerne Mines |
| Eat N Park – Mt. Pleasant | Rochez Brothers & Supply Co. – Braddock |
| Eat-N-Park – New Castle | Rock Tenn Co. – Delaware City |
| Eaton Corp. – Beaver | Rock Tenn Co. Delaware Water Gap |
| Eaton Corp. – Philadelphia | Rockbuilt – Sharpsburg |
| Ebensburg Coal Co. – Colver | Rockhill Iron & Coal Co. – Orbisonia |
| Ebensburg Light, Heat & Power Co. – Ebenburg | Rockhill Iron & Coal Co. Robertsdale |
| Ebensburg Office – Ebensburg | Rockpoint Sand Co. of Pittsburgh Ellwood Junction |
| Ebensburg State Hospital – Ebensburg | Rockwell Industries – Reading |
| Ebensburg Vo- Tech – Ebensburg | Rockwell International New Castle |
| Ebensburg Water Station – Ebensburg | Roebling Steel – Levittown |
| Eberhard Faber Pencil Co. – Mountaintop | Rogers Brothers Corp. – Albion |
| Eberle Tanning Co. | Rohm & Haas Chemical – Bridesburg |
| Econolodge – Levittown | Rohm & Haas Chemical Co. – Philadelphia |
| Economy Sauer Chatham Center – Pittsburgh | Rohm & Haas Chemical Plant – Chester |
| Eddystone Generating Station Crum Creek | Rohm & Haas Chemical Plant – Philadelphia |
| Eddystone Generating Station Eddystone | Rohm & Haas Chemicals, LLC Briston |
| Eddystone Manufacturing Co. – Eddystone | Rohm & Haas Co. Bristol |
| Eddystone Power Station – Philadelphia | Rohm & Haas Co. Philadelphia |
| Eddystone Powerhouse – Eddystone | Rohm & Haas Powder Coatings Plant – Reading |
| Eddystone Steel North Eddystone | Rohm & Hass Chemical – Bristol |
| Edensburg Coal Co. Colver | Rohm Antl Baas Co. – Philadelphia |
| Edensburg Power Ebensburg | Rohm Haas Chem Corp. Bridesburg |
| Edgar Thompson Steel Works – Bessemer | Rohm Haas Chem Corp. Philadelphia |
| Edgar Thompson Works – Braddock | Rohm Haas Chemical Spring House |
| Edgar Thomson Works Braddock | Rohm Haas Co. Bristol |
| Edgar Thomson Works Braddock, Penn. Bessemer | Rohm Haas Co. Building 36 Philadelphia |
| Edgecomb Steel – Philadelphia | Rohm Haas Co. Philadelphia |
| Edgewater Corp. – Oakmont | Rohm Hass Co. Bristol |
| Edgewater Corp. – Pittsburgh | Rohm Hass Co. Philadelphia |
| Edgewater Steel Co. Allegheny County | Rohn & Haas Chemical Co. – Philadelphia |
| Edgewater Steel Co. Oakmont | Rojac Industries – Pittsburgh |
| Edgewater Steel Co. Pittsburgh | Rolle Manufacturing Co. – Lansdale |
| Edgewater Steel Co. Verona | Rolling Rock Brewery – Latrobe |
| Edgewater Steel Oakmont | Roman Catholic Protectory Montgomery County – Flatlands |
| Edgewood Country Club – Johnstown | Ronco |
| Edgewood Mill – Shamokin | Roosevelt Hotel – Pittsburgh |
| Edinboro University – Edinboro | Rorborough Chestnut Hill & Morristown Railway Co. – Philadelphia |
| Edison & Illuminating Co. – Hazleton | Rorer Group, Inc. – Montgomery County |
| Edison Electric Illuminating Co. – Altoona | Rosedale Coke Plant – Johnstown |
| Edison Electric Illuminating Co. Bellefonte | Rosedale Foundry – Rosedale |
| Edison Electric Illuminating Co. Chester | Rosedale Foundry & Machine Co. Pittsburgh |
| Edison Electric Illuminating Co. Hazelton | Rosedale Knitting Mills – PA |
| Edison Electric Illuminating Co. Lancaster | Rosedale Knitting Mills – Reading |
| Edison Electric Illuminating Co. Mt Carmel | Rosena Furnace – New Castle |
| Edison Electric Illuminating Co. Shamokin | Rosena Furnace New Castle |
| Edison Electric Illuminating Co. Sunbury | Rossiter, McGovern & Co. – Pittsburgh |
| Edison Electric Light Co. – Philadelphia | Rosslyn Farms School – Carnegie |
| Edison Electric Light Co. York | RosTraver School – Rostraver |
| Edison Heating Plant Unit 3 Philadelphia | Rothrock Dealership – Allentown |
| Edison International Homer City | Rotoblast – Butler |
| Edison Light & Power Co. – York | Round House – Sharpsburg |
| Edison Light Co. – Middletown | Route 119 Road & Bridge |
| Edison Mission Energy Homer City | Roxborough Chestnut Hill & Morristown Railway – Shawmut Station |
| Edison Steam Plant 9Th Sansom Philadelphia | Roxborough Hospital – Philadelphia |
| Edith Furnace Allegheny | Roxborough Memorial Hospital – Philadelphia |
| Edw. Harrington Son & Co. – Philadelphia | Royal Swan Inc. General Ribbon Mills, Inc. Catasauqua |
| Edward Fay & Son – Philadelphia | Royston Laboratories – Blawnox |
| Edward G. Budd Manufacturing Co. – Philadelphia | Rozman – Pittsburgh |
| Edward Spohrer – Pittston | Rps – Moon Township |
| Edwin Harrington Son & Co. – Philadelphia | Rubber Co. Rolls, Inc. Meadowlands |
| Ehret Magnesia Manufacturing Co. – Port Kennedy | Rubel – Erie |
| Einstein Medical Center – Philadelphia | Ruffs Dale |
| Eisenhower Apartments – Reading | Run Allegheny |
| El Rama Power Station – Elrama | Rural Valley Elementary School – Rural Valley |
| El Rama Power Station – Monaca | Rush Boiler Co. – Midland |
| Eleanor Shaft Mine | Russell Mill Rochester |
| Electra Products Co. Lansdale | Russell Standard – Bridgeville |
| Electralloy Corp. Oil City | Russian American Manufacturing Co. Philadelphia |
| Electric & Gas – Dubois | Russian American Manufacturing Co. Pittsburgh |
| Electric Auto-Lite Co. – Hazleton | Russian Orthodox Church – Charleroi |
| Electric Co. Of America Land Title Building – Philadelphia | Rust Boiler Co. Midland |
| Electric Light Department – Lansdale | Rust Engineering Co. Pittsburgh |
| Electric Power Station – Nanticoke | Rust Furnace Co. Pittsburgh |
| Electric Storage Battery Co. – Philadelphia | Ruth Bennett Project – Chester |
| Electric Traction Co. – Philadelphia | Ryan Homes – Robinson |
| Electricians Union – Local 98 (I.B.E.W.) – Philadelphia | Ryder & Richmond Oil Co. – Bradford |
| Electro Alloy Corp. – Oil City | Ryerson Station – Ryerson Station |
| Electro Chemicals – Emmaus | Rymet Corp. King of Prussia |
| Electrotherm Corp. Philadelphia | S Faith Co. – Philadelphia |
| Elementis Pigments, Inc. – Easton | S M S Automotive – Philadelphia |
| Elenger Ind. – Moscow | S Morgan Smith Co. – York |
| Elenger Industries Moscow | S S Marvin Branch – Pittsburgh |
| Eliza Furnace Plant – Pittsburgh | S. Bern Ohio Co. – Rouseville |
| Eliza Pipe Shop – McKees Rocks | S. Ewart & Co. – Pittsburgh |
| Elizabeth Dam – Elizabeth | S. F. Whitman Philadelphia |
| Elizabeth Elementary School – Elizabeth | S. F. Whitman Son – Philadelphia |
| Elizabeth Sewage Treatment Plant – Elizabeth | S. F. Whitman Son Philadelphia |
| Elizabeth Steel Magee Hospital – Pittsburgh | S. Faith & Co. – Philadelphia |
| Elizabeth Township Municipal – Elizabeth | S. I. P, Inc. – Parsons Chemical Engineer, Inc. |
| Eljer Co – Ford City | S. J. Shimer & Sons – Milton |
| Eljer Manufacturing – Ford City | S. J. Shimer & Sons Milton |
| Eljer Plumbing Ware Corp. – Ford City | S. Jarvis Adams Co – Midland |
| Elk County General Hospital – Ridgeway | S. K. F. Industries Inc. Philadelphia |
| Elk Creek Station – Erie | S. Lancaster Co School Authority- New Sr High School – Quarryville |
| Elk Tanning Co. – Coudersport | S. MArgolis Co. Philadelphia |
| Elk Tanning Co. Curwensville | S. Morgan Smith Co. – York |
| Elkland Leather Co. – Elkland | S. S. African Planet Ship |
| Ellectralloy Corp. Oil City | S. S. Atlantic Engineering Chester |
| Elliot Co. – Indiana | S. S. Atlantic Navigator Chester |
| Elliot Co. – Ridgway | S. S. Ektor Philadelphia |
| Elliot Co. Division of Carrier Jeanette | S. S. Esso Jamestown Chester |
| Elliot Philadelphia | S. S. Globe Progress Philadelphia |
| Elliot Steel Co. – Jeannette | S. S. Gulf Hollander Philadelphia |
| Elliott Co. – Accoustical Lab – Ridgway | S. S. Gulf Lube Girard Point |
| Elliott Co. Ridgway | S. S. Hills Chester |
| Elliott Turbomachinery Co. Inc. – Jeannette | S. S. Illapel Chester |
| Ellis – Philadelphia | S. S. Ly Kaion Philadelphia |
| Ellis School – Pittsburgh | S. S. Mercantile Wave. Chester |
| EllisCo. Bala Cynwyd | S. S. Midland Philadelphia |
| Ellsworth Coal Co. – Cokeburg | S. S. Mobil Aero Chester |
| Ellsworth Coal Co. Ellsworth | S. S. Olympic Chester |
| Ellsworth Collieries Co. – Ellsworth | S. S. Olympic Rock Chester |
| Ellwood City Forge Corp. – Ellwood City | S. S. Olympic Rock Philadelphia |
| Ellwood City Hospital – Ellwood City | S. S. Olympic Storing Chester |
| Ellwood Elementary, 13Th Oak Lane Philadelphia | S. S. Robin Sherwood Philadelphia |
| Ellwood Tube Ellwood City | S. S. Sister Katingo Chester |
| Elrama Power Plant – Elrama | S. W. Grease & Oil – Bakerstown |
| Elrama Power Plant – Pittsburgh | S. W. Grease & Oil |
| Elrama Power Station Washington County Elrama | S.S. African Planet (Ship) – Bethlehem |
| Elwood City Forge Ellwood City | S.S. Atlantic Eng. – Chester |
| Elwyn Training School – Elwyn | S.S. Atlantic Navigator – Chester |
| Embreeville State Hospital Embreeville | S.S. Esso Jamestown – Chester |
| Emlenton Refining Co. – Emlenton | S.S. Gulf Lube – Girard Point |
| Empire Building – Pittsburgh | S.S. Hills – Chester |
| Empire Iron & Steel Co – Mackungie | S.S. Illapel – Chester |
| Empire Iron & Steel Co. – Catasauqua | S.S. Marvin Branch – Pittsburgh |
| Empire Mills – Philadelphia | S.S. Mercantile Wave – Chester |
| Empire Reeves Steel Corp. – Pittsburgh | S.S. Mobil Aero – Chester |
| Empire Steel Products – Temple | S.S. Olympic – Chester |
| Employment Security Office – Chester | S.S. Olympic Rock – Chester |
| Enamel Products & Plating Co. – McKeesport | S.S. Richfield – Chester |
| Enameled Metals – Etna | S.S. Sister Katingo – Chester |
| End Coal Co. – Lee | Saba Power Farouqabad |
| End Coal Co. Scranton | Sabins Manufacturing Co. – Versailles |
| End Electric Light Co. – Liberty | Sachenmair – Holmesburg |
| End Electric Light Co. Pittsburgh | Sacred Heart Church – Jeanette |
| End Heating & Energy Co. – Philadelphia | Sacred Heart Hospital – Allentown |
| End Light Co. – Pittsburgh | Saegertown Manufacturing Co. – Saegertown |
| End Rolling Mill Co. – Lebanon | Safe Harbor Water Power Corp. – Safe Harbor |
| Eng Research Bld 19 Test Coil – York | Safety Armorite Conduit Co. Pittsburg |
| Engineering Co. | Safety Equipment Co. – Connellsville |
| Engr Annex – Pittsburgh | Saint Agnes Hospital – Philadelphia |
| Enterprise Galvanizing – Philadelphia | Saint Ignatius Church – Yardley |
| Enterprise Transit Co. – Chaffee | Saint Joe’s Lead Monacca |
| Episcopal Hospital – Philadelphia | Saint Johns Church – Delmont |
| Epsilon Zeta Alumni Association – Philadelphia | Saint Joseph’s School – Norristown |
| Equibank – Clairton | Saint Marys Church – Glenshaw |
| Equipment Engineering Co. – Pittsburgh | Saint Paul’s Church – Philadelphia |
| Equitable Gas Allegheny Center | Salem Brosius Inc. – Carnegie |
| Equitable Gas Co – Elrama | Salem Brosius Inc. Pittsburgh |
| Equitable Gas Energy Co. – Pittsburgh | Salem Park Townhomes – Mechanicsburg |
| Equitable Gas Energy Co. Waynesburg | Salisbury School – Salisbury |
| Equitable Gas Steam Heating Co. – Pittsburgh | Salk Hall – University of Pittsburgh – Pittsburgh |
| Equitable Ill Gas Light Co. – Philadelphia | Sall Geo Metals Co. – Philadelphia |
| Equitable Illuminating Gas Light Co. – Philadelphia | Salvucci Engineering Pittsburgh |
| Equitable Life Assurance Society – Pittsburgh | Sam Jacks Condominium – Indiana |
| Equitable Life Assurance Society Gateway Center – Pittsburgh | Sam Liberto Ford – Jeannette |
| Erben Harding Co. – Philadelphia | Samaritan Hospital – Philadelphia |
| Erben, Harding & Co. – Philadelphia | Sampenn Co. Baltimore, MD |
| Erben, Harding & Co. Tacony | Samueal Rea Car Shop – Holidaysburg |
| Eric C Holzer Chester | Samuel Haight & Co. Bridgewater |
| Eric City Ironworks – Erie | Samuel Rea Car Shop – Hollidaysburg |
| Eric Forge & Steel – Erie | San Juan Cement Co. Vega Alta |
| Erie Cambridge Union & Corry Railway Co. – Mill Village | Sandusky Cement Co. – York |
| Erie Car Works, Limited – Erie | Sandusky Foundry |
| Erie City Energy Division Erie | Sandusky Foundry Hazelton |
| Erie City Ironworks – Erie | Sani Dairy – Johnstown |
| Erie Coke Co. – Erie | Sanitary Milk Co. Curwensville |
| Erie County Courthouse – Erie | Sans Corp. – Erie |
| Erie County Electric Co. – Erie | Santa Elena – Chester |
| Erie Electric Motor Co. – Erie | Satellite Alloy Corp. – Springdale |
| Erie Fish Co. Erie | Saucon – S. Bethlehem |
| Erie Forge & Steel Co. – Erie | Saucon Plant – Bethlehem |
| Erie Forge Steel Erie | Saugatuck – Chester |
| Erie Industrial Insulation – McKean | Sauquoit Silk Co. – Scranton |
| Erie Lackawanna Railroad Pennsylvania State Police Kingston | Savage Arms Corp. – Sharon |
| Erie Lackawanna Railroad Public Siding Kingston | Savage Arms Corp. Philadelphia |
| Erie Lackawanna Railroad Team Track Kingston | Savoia Property Management Co. – Norwood |
| Erie Lighting Co. – Erie | Saw Hill Tube Division |
| Erie Malebus Iron – Erie | Saw Hill Tubular Sharon |
| Erie Marine – Erie | Sawhill Armco Ak Steel – Sharon |
| Erie Railroad Co. Dunmore | Sawhill Tubular Sharon |
| Erie Railroad Co. Meadville | Sawhill Tubular Wheatland |
| Erie Railroad Co. Susquehanna | Saxonburg Sintering Plaint – Saxonburg |
| Erie Works – Erie | Saxonburg Sintering Plant |
| Erie Works Power Plant Erie | Saxton Iron Co. – Saxton |
| Erwin Plumbing – Philadelphia | Sayre Electric Co. – Sayre |
| Es Magee Hospital – Pittsburgh | Sayre |
| Esab Co. Hanover | Says Garage Harrisville |
| Esab CO. York | Scaife Co. – Oakmont |
| Esquire Cleaners & Laundry – Pennsylvania Ave. | Scan Chester |
| Essington Co. | Sch Authority New Sr High School Quarryville |
| Esso Corp. Exxon – Lawrenceville | Schaaf Heating & Air Conditioning – Greensburg |
| Esso Standard Oil Co. – Pittsburgh | Schaefer Brewery – Philadelphia |
| Est Of James Lord Jr. – Philadelphia | Schaeffer Brewery – Fogelsville |
| Estate Of H.W. Oliver – Pittsburgh | Scharff Equipment Co. Philadelphia |
| Estate Of Henry W. Oliver – Pittsburgh | Scheie Eye Hospital – Philadelphia |
| Estate Of James Lord Jr. – Philadelphia | Schendis Ferry |
| Estate Of Stephen Greene – Philadelphia | Schenley Distillers Corp. – Schenley |
| Estate Of William Weightman – Philadelphia | Schiable’s Bakery Easton |
| Eterno Asbestos Lumber & Shingle Co. – Redington | Schick Inc. – Lancaster |
| Ethel Corp. – Pasadena | Schmidt & Ault Paper Co. – York |
| Eureka #30 – Scalp Level | Schmidt Lumber Millwork – Scranton |
| Eureka #7 – Beulah | Schoen Pressed Steel Co. – Pittsburgh |
| Eureka Colliery #35 – Wison | Schoen Pressed Steel Co. Allegheny City |
| Eureka Div Of Litton Ind – Dunmore | Schoen Pressed Steel Co. Pittsburgh |
| Eureka Limestone Tank Insulation Philadelphia | Schoen Steel Wheel Co. McKees Rocks |
| Eureka Specialty Co. Scranton | Schoen Steel Wheel Co. Pittsburgh |
| Eureka Stone Quarry Inc. Bucks County | Schoeneck Farms Inc. Nazareth |
| Eureka Stone Quarry Inc. Chalfont | School – Chestnut Hill |
| Eureka Stone Quarry Inc. Eureka | School Authority- New Sr High School |
| Eureka Stone Quarry Inc. Tank Insulation Philadelphia | School Chestnut Hill |
| Evangelical Community Hospital – Lewisburg | School District of Philadelphia – Philadelphia |
| Evanray Car Wash – Natrona Heights | School Exceptional Children – Robinson Township |
| Evans Colliery Co. – Hazleton | School Selingrove Center – Selinsgrove |
| Evans Memorial – Philadelphia | SchoolChurches – Altoona |
| Everets & Overdeer – Lancaster | Schooley Colliery – Dunmore |
| Evergreen Nursing Home Center – Harmony | Schools & Churches – Altoona |
| Everts & Oerdeer, Inc. – Lancaster | Schoot Optical Duryea |
| Ew Bowman Inc. Uniontown | Schroeder Manufacturing Co. – McKees Rocks |
| Ewen Breaker – Pittston | Schulylkill Station – Philadelphia |
| Excelsior Brass Reading | Schutte & Koerting Co. Cornwells, Bucks County |
| Excelsior Coal Co. – Excelsior | Schutte & Koerting Co. Philadelphia |
| Excelsior Steam Planning Mill – Mauch Chunk | Schutte Koerting Company Cornwells Heights |
| Exchange Building – Philadelphia | Schutte Koerting Cornwell Heights |
| Exelon Generation Co. – Philadelphia | Schuykill Forge Co. Cornwells Heights |
| Exelon Power – Eddystone | Schuylkill Arsenal Property – Philadelphia |
| Exelon Power Phoenixville | Schuylkill Forge Co. – Cornwell Heights |
| Exeter Colliery – Pittston | Schuylkill Forge Co. Philadelphia |
| Exeter High School – Exeter | Schuylkill Products Inc. Cressona |
| Exeter Machine Works – Pittston | Schuylkill Railway Co. – Girardville |
| Exeter Power Co. – Pittston | Schuylkill Station – Philadelphia |
| Exide Battery Co. – Philadelphia | Schuylkill Valley Traction Co. – Philadelphia |
| Exide Battery Philadelphia | Schwenkfelder Church – Worcester |
| Exotic Metals – Ridgway | Scofield Engineering Co. – Philadelphia |
| Exton Mall – Exton | Scofield, Mason & Co. – Philadelphia |
| Extrusion Die Makers Murrysville | Scotland School For Vets – Scotland |
| F & M Schaefer Brewing Co. – Trexlertown | Scott Colliery – Mt. Carmel |
| F Miller Spring & Manufacturing Co. – Pittsburgh | Scott Foam – Eddystone |
| F. & M. Schaefer Brewing Co. | Scott Paper – Paper Machine Nbr 13, 18 Chester |
| F. A. French & Sons – Latrobe | Scott Paper Co. – Chester |
| F. A. Pavlick – Fairless Hills | Scott Paper Co. Eddystone |
| F. A. Poth & Sons – Philadelphia | Scott Paper Co. Front Market |
| F. A. Poth Brewing Co. – Philadelphia | Scott Paper Co. Philadelphia |
| F. B Wright Co. Pittsburgh | Scott Paper Co. Research & Development Center – Essington |
| F. B. Wright Co. – Bridgeville | Scott Paper Mill – Chester |
| F. C Roberts & Co. Engineers – Philadelphia | Scott Township Elementary School Scott Twp |
| F. F. Geisler & Co. – Pittsburgh | Scottdale Furnace Co. Scottdale |
| F. G. Vogt & Sons – Philadelphia | Scottdale Iron & Steel Co. – Scottsdale |
| F. H. Kalbfleisch Corp. – Erie | Scottdale Machine Foundry Construction Co. Scottdale |
| F. M. Schaefer Brewing Co. Trexlertown | Scottdale Wood Products Co. – Scottsdale |
| F. Miller Spring & Manufacturing Co. – Pittsburgh | Scottsdale Furnace Co. – Scottsdale |
| F. R. Dravo & Co. – Pittsburgh | Scranton Anthracite Briquette Co. – Dickson |
| F. W Darlington C.E. – Philadelphia | Scranton Anthracite Briquette Co. Scranton |
| F. W. Tunnell Glue Manufacturing – Philadelphia | Scranton Axle & Spring Co. – Scranton |
| Fabricating Engineering, Inc. York | Scranton Bolt & Nut Co. – Scranton |
| Fairhill Apartments – Philadelphia | Scranton Electric Co. – Pittston |
| Fairless Hills Steel Mill – Morrisville | Scranton Electric Construction Co. Scranton |
| Fairless Steel – Fairless Hills | Scranton Gas & Water Co. – Forest City |
| Fairless Works #2 Continuous Annealing Line Morrisville | Scranton Gas & Water Co. Scranton |
| Fairless Works Us Steel – Fairless Hills | Scranton High School Scranton |
| Fairmoint Wooster Mills – Philadelphia | Scranton Lace Curtain Co. Scranton |
| Fairmont Foundry, Inc. Hamburg | Scranton Ordinance Division Scranton |
| Fairmont Passenger Railroad Co. | Scranton Railway Co. – Scranton |
| Fairmont Supply Co. – Washington | Scranton Technical High School – Scranton |
| Fairmount Construction Co. – Philadelphia | Scrap Philadelphia |
| Fairmount Park Commission – Philadelphia | Scraton Ordinance Division – Scranton |
| Fairmount Park Transportation Co. – Philadelphia | Scrubgrass Power Plant – Scrubgrass |
| Fairview School – Fairview | Seaboard Container Corp. – Bristol |
| Fairview State Prison – Scranton | Seaboard Steel & Manganese Corp. – Temple |
| Falcon Club – New Castle | Seaboard Steel Manganese Temple |
| Falcon Equipment Co. New Brighton | Sealtest Foods – Philadelphia |
| Fanny Farmers Candy Manufacturing – Harrisburg | Seanor Coal Co. Saltsburg |
| Farentum Borough – Tarentum | Sears & Roebuck Allentown |
| Farm Show Building – Harrisburg | Sears & Roebuck Ambridge |
| Farmers Cheese Co. New Wilmington | Sears & Roebuck Mifflin |
| Farmers Cheese New Wilmington | Sears & Roebuck Philadelphia |
| Farmers Deposit National Bank Building – Pittsburgh | Sears & Roebuck Store – Lancaster Pike |
| Farrell Steel Works & Furnaces – Farrell | Sears Beaver Valley Mall Beaver |
| Farview State Hospital – Waymart | Sears Indiana |
| Fast & Friendly Monaca | Sears Roebuck Co. – Allentown |
| Faust Distillery – Glen Rock | Sears Roebuck Store – Lancaster Pike – Reading |
| Fawcus Machine Co. – Ford City | Sears, Roebuck & Co. – Philadelphia |
| Fayette City – Newell | Seco Warwick – Meadville |
| Fayette Manufacturing Co. – Chester | Second National Bank – Pittsburgh |
| Fayette R. Plumb Co. – Philadelphia | Security Investment Co. – Trafford City |
| Fazekas Frank Easton | Seiferts Bakery – Newton |
| Federal Container Co. – Philadelphia | Selas Corp. of America Bethlehem |
| Federal Enameling & Stamping Co. – McKees Rocks | Selas Corp. of America Dresher |
| Federal Laboratories Inc. Saltsburg | Selden Co. – Bridgeville |
| Federal Office Building Courthouse Philadelphia | Selden Co. End, Pittsburgh |
| Federal Office Building Pittsburgh | Selinsgrove Center School |
| Federal Paper – Arden | Selinsgrove Center School – Selinsgrove |
| Federal Paper Board Co. Inc. Paper Board Division Reading | Selinsgrove State School – Selinsgrove |
| Federal Savings Bank – Ardmore | Semet Solvay Co. – Johnstown |
| Federal Shipbuilding & Dry Dock Co. of Us Pittsburgh | Semet- Solvay Co. Caubria Steel Co. Johnstown |
| Federal Steel Foundry Co. – Chester | Semet- Solvay Co. Dunbar |
| Federal Street Freight Station Philadelphia | Semet-Solvay Co. Cambria Steel Co. – Johnstown |
| Feita Corp. – Philadelphia | Seneca Colliery Pittston Junction |
| Felins Meat Packing – Philadelphia | Seneca Power Station – Kinzua |
| Fels & Co. – Philadelphia | Seneca Valley High School – Seneca Valley |
| Fels Naptha Soap Co. – Philadelphia | Senior High School – Chester |
| Fels Soap Co. – Philadelphia | Senior High School Building – Philadelphia |
| Fenestra Inc. Erie | Sensus Technologies – Uniontown |
| Ferro Corp. Bigler | Septa – Philadelphia |
| Ferro Corp. Erie | Septa Powerhouse Philadelphia |
| Ferro Corp. Hazelton | Sercon Corp. Pittsburgh |
| Ferrows Chemical Co. – Pittsburgh | Sergeant Electric Co. Pittsburgh |
| Fetteroff Coal Co. – Somerset | Sersteel Corp. Pittsburg |
| FH McGraw & Co. Philadelphia | SES Station Martins Creek |
| Fiancisco Sugar Co. – Philadelphia | Sewage Disposal Plant – Philadelphia |
| Fibrous Glass Products – Mountain Top | Sewage Disposal Plant Tyrone |
| Fidelity Bank Building – Philadelphia | Sewage Treatment Plant – Bethel Park |
| Fidelity Insurance Trust & Safety Deposit Co. – Philadelphia | Sewage Treatment Plant – Donora |
| Fidelity Mutual Life Association – Philadelphia | Sewage Treatment Plant – Library |
| Fidelity Mutual Life Insurance Co. – Philadelphia | Sewage Treatment Plant – Lock Haven |
| Fike Dairy Uniontown | Sewage Treatment Plant – Mifflin |
| Filtration Plant – Reading | Sewage Treatment Plant – Muncy |
| Finance Building Capitol Complex – Harrisburg | Seward Power Plant – Johnstown |
| Findlay Refractories Co. Washington | Seward Power Station Seward |
| Finley Township Water Pump Station – Finley Township | Seward Public School – Seward |
| Finnaren & Haley Paint – Connellsville | Sewickley Academy – Sewickley |
| Finnaren Haley Paint Conshohocken | Sewickley High School – Sewickley |
| Fionesta Valley Chemical Co. – Mayburg | Sewickley Valley Hospital – Sewickley |
| Fire Department Repair Shop – Philadelphia | Sfk Industries, Inc. – Philadelphia |
| Fire Hall – McMurray | Sfk Industries, Inc. Sunnytown Pike |
| Fire Inc. Pittsburgh | Sgl Abrasives – Carlisle |
| Firestone Plastics Plant Pottstown | Shady Grove School – Montgomery County |
| Firestone Recapping Center – Scranton | Shadyside Boys Club – Shadyside |
| Firestone Retread Shop – Murrysville | Shafer Block – Somerset |
| Firestone Tire & Chemical Plant – Pottstown | Shaft 2 Irwin |
| Firestone Tire & Rubber Co. – Philadelphia | Shaler High School, Shaler Township – Glenshaw |
| Firestone Tire & Rubber Co. Pottstown | Shaler Jr. High School – Glenshaw |
| First Baptist Church – Sharon | Shaler Township Garage – Glenshaw |
| First Energy Nuclear Operating Co. – Shippensburg | Shallcross School – Philadelphia |
| First Federal Savings & Loan – Sharon | Shamokin & Coal Township Light, Heat & Power Co. – Shamokin |
| First National Bank – Allentown | Shamokin Dam – Selinsgrove |
| First National Bank Building Allentown | Shamokin Dam – Sunberry |
| First National Bank Building Charleroi | Shamokin Light Heat & Power Co. – Shamokin |
| First National Bank Building Pittsburgh | Shanago Steel – Pittsburgh |
| First Pennsylvania Banking Trust Building Philadelphia | Sharon Coke Co. Masontown |
| First Presbyterian Church – Morrisville | Sharon Coke Co. Pittsburgh |
| First Sterling Steel Mill – McKeesport | Sharon Coke Co. Runco |
| Firstenergy Nuclear Operating Co. Shippingport | Sharon Coke Co. Sharon |
| Firth Sterling Steel Co. – McKeesport | Sharon High School – Sharon |
| Firth-Sterling Inc. Pittsburgh | Sharon Iron Co. Sharon |
| Firth-Sterling Steel Co. – Dremmler | Sharon Steel Corp. Farrell |
| Firth-Sterling Steel Co. McKeesport | Sharon Steel Farrell Works Oxygen Plant Farrell |
| Fischer Porter – Warminster | Sharon Steel Hoop Co. – Pittsburgh |
| Fisher Body – Mifflin | Sharon Steel Hoop Co. Sharon |
| Fisher Body Corp. – Fleetwood | Sharon Steel Monessen |
| Fisher Body Corp. Div. of General Motors Fleetwood | Sharon Transformer Plant Boiler House Sharon |
| Fisher Scientific – Indiana | Sharon Tube Co. – Sharon |
| Fisher Scientific Co. Pittsburgh | Sharon Water Works Co. – Sharon |
| Fishers Big Wheel – Natrona Heights | Sharpless & Sons – Philadelphia |
| Fishers Big Wheel Stores – New Castle | Sharpsville Furnace Co. – Sharpsville |
| Fitzpatrick Sheetmetal – Dubois | Sharpsville Roofing Sharpsville |
| Fitzsimmons Junior High School – Philadelphia | Shaw Avenue School – Clairton |
| Flack Bros Inc. – Harrisburg | Shaw Walker – Green Tree |
| Flack Bros Inc. Harrisburg | Shawville Generating Station Units 3, 4 Shawville |
| Flagg, Stanley G. & Co. – Pottstown | Shawville Power Station – Clearfield |
| Flannery Bolt Co. – Bridgeville | Shawville Powerhouse Clearfield |
| Flavor- Rite Trucking Co. Pittsburgh | Sheesley Construction Johnstown |
| Fleetwood Metal Body Co. – Fleetwood | Sheetmetal Workers Union – Local 19 – Philadelphia |
| Fleischer Mills – Philadelphia | Shelbe & Fisher, Fairmount Fork Works – Philadelphia |
| Flexi- Patch Co. | Shelby Steel Tube Co. – Ellwood City |
| Flinn Dreffein York | Shelby Steel Tube Co. Greenville |
| Flood City Brass Pump – Johnstown | Shellby Steel Tube Co. – Pittsburgh |
| Floor Chemical Corp. Philadelphia | Shelly Brothers Inc. – Lansdale |
| Floor Plant Building 500 – Lancaster | Shelly Brothers Inc. Lansdale |
| Florig Equipment Co. Conshohocken | Shelocta Power Station – Shelocta |
| FMC – Calmar | Shelocta Powerhouse Johnstown |
| FMC – Meadville | Shenago Steel Pittsburgh |
| FMC Corp. Colmar | Shenandoah Chester |
| FMC Corp. Kennett Square | Shenango China Co. – New Castle |
| Fmc Corp., American Viscose Corp. – Meadville | Shenango Coke Batteries – Neville Island |
| Fogelsville Plant – Allentown | Shenango Furnace Co. – Sharpsville |
| Fogelsville Plant Young Building Fogelsville | Shenango Furnace Co. Wilpen |
| Follansbee Brothers Co. – Pittsburgh | Shenango Inc. – Pittsburgh |
| Folwell Bros. & John Bromley Sons – Philadelphia | Shenango Inc. Davison Coke Iron Pittsburgh |
| Food Distribution Center – Philadelphia | Shenango Inc. Pittsburgh |
| Food Fair Philadelphia | Shenango Mall – Sharon |
| Food Fair Store Warehouse Philadelphia | Shenango Pottery Co. – New Castle |
| Foodland Store – Bridgeville | Shenango Presbyterian Home – New Wilmington |
| Foodland Store – Indiana | Shenango Steel – Nequehoning |
| Foot Mineral Co. – Exton | Shenango Steel – Neville Island |
| For Scrap – Philadelphia | Shenango Steel – Sharpsville |
| Forbes Regional Health Center – Monroeville | Shenango Steel – Wheatland |
| Forbes Steel Co. – Canonsburg | Shenango Valley Mall – Hermitage |
| Ford & Kendig Co. – Connellsville | Shenango Valley Steel Co. – New Castle |
| Ford & Kendig Co. Conshohocken | Shenango Valley Water Co. – Sharon |
| Ford Brownstown Parts Distribution Center – Parts Depot | Shenango, Inc. – Pittsburgh |
| Ford City Foundry & Machine Co. – Ford City | Shenango, Inc. Sharpsville |
| Ford City Foundry Machine Co. Ford City | Sheridan Machine Easton |
| Ford City Foundry Machine Co. Graff Station | Sheridan Supply Co. – Newmanstown |
| Ford Dealership – Emlington | Sherton Inn – Clarion |
| Ford Motor Co. Chester | Sherwin Hotel – Pittsburgh |
| Ford Motor Co. Glassmere | Sherwood Refining Co. Inc. – Warren |
| Ford Motor Co. Marcus Hook | Sherwood Refining Co. Inc. Warren |
| Ford Motor Co. Meadville | Sherwood School – Forest Park |
| Ford Motor Co. Pittsburgh | Shipman Coal Co. – Shamokin |
| Ford Pitt Hotel Pittsburg | Shippensburg State College – Shippensburg |
| Forged Steel Wheel Co. – Butler | Shipping Atomic Power Station – McKees Rocks |
| Forrest Laundry – Philadelphia | Shippingport – Sharon |
| Fort Bedford Inn – Bedford | Shippingport Atomic Power Station Shippingport |
| Fort Miffin- Central Heating Plant | Shippingport Nuclear Power Plant – Beaver Valley |
| Fort Miffin- Central Heating Plant – Philadelphia | Shippingport Powerhouse – Atomic Plant – Shippensburg |
| Fort Miffin- Naval Ammunition Depot – Philadelphia | Shipyard Ambridge |
| Fort Mifflin – Philadelphia | Shipyard Bethlehem |
| Fort Mifflin Terminal Philadelphia | Shipyard Philadelphia – Philadelphia |
| Fort Pitt Brewing Co. – Pennsylvania | Shoenberger Steel Co. – Pittsburgh |
| Fort Pitt Foundry – McKeesport | Shoenberger Works – Pittsburgh |
| Fort Pitt Hotel – Pittsburgh | Shook Anderson Manufacturing Co. – Pittsburgh |
| Fort Pitt Steel Casting – McKeesport | Shopping Center – Erie |
| Fort Pitt Supply Co. – Pittsburgh | Shopping Center – Scranton |
| Fort Washington – Forrest Hills | Shopping Center – Wilkes Barre |
| Forty-Fort Colliery – Bennett | Shuanberger Steel Co. – Pittsburgh |
| Forty-Fort Colliery Bennett | Shwartz Paper Mill – Philadelphia |
| Foseco Inc. – Mt. Braddock | Sibberline – Hometown |
| Foster Wheeler Corp. – Mountain Top | Siberline – Lansford |
| Foster Wheeler Corp. Oil City | Sid Harvey of Pa King of Prussia |
| Foster Wheeler Corp. Sunbury | Sid Harvey of Reading – Reading |
| Foster Wheeler Plant – Mountaintop | Sid Harvey of Reading Allentown |
| Foster-Wheeler – Oil City | Side School – Scranton |
| Founders Hall, Rt. 322 – Hershey | Side Vo- Tech – Pringle |
| Four Corners Powerhouse – Avoca | Signal Finance – Uniontown |
| Four States Coal Coke Co. – Pittsburgh | Silk Mill – Dorranceton |
| Fox Grocery – Belle Vernon | Silver Brook Coal Co. – Mauch Chunk |
| Fox Grocery Co. – Wetterau – Belle Vernon | Silver Brook Coal Co. Silver Brook |
| Fox Run Apartments – Philadelphia | Silver Steel Corp. – Bettendorf |
| Francis Brothers & Jellett Inc. – Philadelphia | Simon Gratz High School – Philadelphia |
| Francisco Sugar Co. – Philadelphia | Simonds Abrasive – Philadelphia |
| Frank & Sedar Dept. Store – Philadelphia | Simonds Abrasives Co. Philadelphia |
| Frank Ford – Philadelphia | Simonians C F & Sons Philadelphia |
| Frank Goodheart Sons Inc. Lancaster | Simonim Oil Co. Philadelphia |
| Frank Kneeland Machinery Co. – Pittsburgh | Simonton Glass Plant Pennsboro, WV |
| Frank Metzler Farm – Somerset | Simpson & Watkins Bennett |
| Frank R. Phillips Power Station Wireton | Simpson & Watkins Carbondale |
| Frank Roberts & Sons Inc – Punxsutawney | Simpson & Watkins Coxton |
| Frank Romano – Philadelphia | Simpson & Watkins Duryza |
| Frank Samuels – Ce Minerals Valley Forge | Simpson & Watkins Peckville |
| Frank Sedar Dept. Store Philadelphia | Simpson & Watkins Scranton |
| Frankford Arsenal – Philadelphia | Simpson & Watkins Wyoming |
| Frankford Arsenal Bureau of Ordinance – Philadelphia | Sinclair – Koppers Chemical Plant – Monaca |
| Frankford Electric Railway Co. | SInclair Koppers Co. Kobuta Plant Monaca |
| Frankford Hospital – Philadelphia | SInclair Koppers Co. Monomer Plant Kobuta |
| Frankford Junction – Philadelphia | Sinclair Oil – Pascagoula, MS |
| Frankford Metal Treating – Philadelphia | Sinclair Refining Co. Maple Glen |
| Frankford Plan – Philadelphia | Sinclair Refining Co. Marcus Hook |
| Frankford Tannery Philadelphia | Sinclair Refining Co. Philadelphia |
| Frankfort Metal Treating Philadelphia | Sinclair Refining Co. Trainer Chester |
| Frankfurt Plant Philadelphia | Sinclair-Koppers – Kabuta |
| Franklin Building Supply – Nashville | Singer Ice Co. – McKees Rocks |
| Franklin Hospital – Franklin | Singer- Nimick Works Pittsburgh |
| Franklin Lumber Co. – New Alexandria | Singer-Nimick Works – Pittsburgh |
| Franklin Mall – Franklin | Sinking Spring Foundry Co. – Sinking Springs |
| Franklin Mall – Washington | Sinking Springs |
| Franklin Manufacturing Co. – Franklin Manufacturing Co | Sisters of Good Shepherd Philadelphia |
| Franklin Manufacturing Co. Stoneboro | Sisters Of Mercy Bldg B- Miseracordia College – Dallas |
| Franklin Marshall College – Lancaster | Sisters Of the Good Shepherd – Philadelphia |
| Franklin Mint – Philadelphia | Sisters of The Good Shepherd Scranton |
| Franklin Motel – Philadelphia | Sitkin Metal Trading, Inc. Lewistown |
| Franklin Quality Refining Co. – Franklin | Sivics Hardware Store – Monessen |
| Franklin Refinery Philadelphia | Skateland Motors – Johnstown |
| Franklin Smelting & Refining – Philadelphia | Skating Rink Bethlehem |
| Franklin Smelting Co. – Concordville | SKF Altoona Plant Addition Altoona |
| Franklin Smelting Refining Philadelphia | Skf Ball Bearing Front Erie Streets Philadelphia |
| Franklin Steel Works – Franklin | Skf Industries – Philadelphia |
| Franklin Sugar Co. – Philadelphia | Skf Plant Addition – Altoona |
| Franklin Sugar Refining Co. – Philadelphia | Skin & Cancer Clinic – McKees Rocks |
| Franklin Works – Johnstown | Skin Cancer Clinic McKees Rocks |
| Frantz Distillers, Inc. – Berlin | Skinner Engine Co. – Erie |
| Frantz Heating & Roof Co. – Reading | Slatington Foundry, Mach & Boiler Works – Slatington |
| Fraternal Club – Guffey | Slatington Railway Co. |
| Frazee Lumber Co. Uniontown | Slippery Rock Middle School – Slippery Rock |
| Frazier Engineering – Monroeville | Slippery Rock State Teachers College – Slippery Rock |
| Fred Beesley Co. – Williamsport | Slippery Rock University – Slippery Rock |
| Frederick A. Poth – Philadelphia | Slofee Mine – Portage |
| Freebrook Corp. – Kittanning | Small Powerhouse – Lewistown |
| Freedman Wholesale Lumber Co. – Russellton | Smethport School – Smethport |
| Freedom High School – Bethlehem | Smith Brothers Ironworks – Philadelphia |
| Freedom Oil Works Co. – Freedom | Smith Kline & French – Connellsville |
| Freedom Refinery Freedom | Smith Kline French Beckman Philadelphia |
| Freedom-Valvoline Oil Co. – Freedom | Smith Kline French Conshohocken |
| Freemans Run | Smith Kline French Philadelphia |
| Freeport Brick Co. – Freeport | Smith Kline French Swedeland |
| Freeport Terminal Inc- Liquid Bulk Terminal – Freeport | Smith Kline French Swedesboro |
| Freeport Water Works Co. – Freeport | Smith Kline French Upper Marion |
| Freight Pitcalm Pittsburgh, Philadelphia Stockyard Philadelphia | Smithfield Prison – Smithfield |
| Freight Pitcalm Pittsburgh, Woodland Avenue Philadelphia | Smithfield St. Terminal – Pittsburgh |
| Freihofer Baking Co. – Philadelphia | Smoketown Elementary School – Lancaster |
| Freihofer Vienna Baking Co. – Philadelphia | Snellenburg Building – Philadelphia |
| Frick Building – Pittsburgh | Social Security Building 8Th Arch Streets Philadelphia |
| Frick Hospital – Mount Pleasant | Socony Vacuum Oil Co. – McCrae |
| Friends School – Haverford | Solesbury Elementary School – Solesbury |
| Friendship Bank – Liberty | Solis-Cohen – Philadelphia |
| Friskies Pet Care Co. – Allentown | Somerset Ave. – Windber |
| Frog Switch Manufacturing Co. – Carlisle | Somerset Coal Co. – Bosewell |
| Frog Switch MFG C Carlisle | Somerset Jail – Somerset |
| Front Street Station -Erie | Somerset Mills – Philadelphia |
| Fruehauf Plant – Uniontown | Somerset Mills Philadelphia |
| Fruehauf Trailers – Johnstown | Somerset Steel Erection – Somerset |
| Ft. Indiantown Gap Military Reservation – Annville | Somerset Warehouse – Somerset |
| Ft. Marion Power Station – Point Marion | Somerset, Mall – Somerset |
| Ft. Pitt Brewing Co. – Sharpsburg | Somma Sheet Metal – Verona |
| Ft. Pitt Hotel – Pittsburgh | Songer Construction Co. Washington |
| Ft. Pitt Malleable & Grey Iron Co. – McKees Rocks | Sonman Shaft Coal Co. |
| Furlong Construction Co. – Hilltown | Sonman Shaft Coal Co. – Portage |
| Furlong Construction Co. | SoNMan Shaft Coal Co. Portage |
| G & H Steel Service Drexel Hill | Sonneborn Division Petrolia |
| G Ramsey Sons New Castle | Sonoco Products Co. Downingtown |
| G W Childs Public Ledger Building – Philadelphia | Sony Plant – New Stanton |
| G. A. F. Corp. Industrial Prod Division Erie | Sorensen Industries Inc. Darry |
| G. A. Haupt, Jr. – Frackville | Soult Wholesale Co. – Clearfield |
| G. A. Haupt, Jr. Frackville | South Allegheny High School – McKeesport |
| G. B. Markle & Co. #4 Colliery Jeddo | South Buffalo School Sarver |
| G. B. Markle & Co. Highland #5 Colly Jeddo | South Carolina Philadelphia |
| G. B.Markle & Co. – Gedda | South Chester Tube Co. – Chester |
| G. C. Murphy Co. Ambridge | South Heights Power Station – Wireton |
| G. C. Murphy Co. Bridgeville | South Hill Terrace – Brownsville |
| G. C. Murphy Co. Clarion | South Hills High School – Pittsburgh |
| G. C. Murphy Co. Corry & Farrell | South Hills Ice Co. – Dormont |
| G. C. Murphy Co. Corry | South Hills Village – Bethel Park |
| G. C. Murphy Co. Etna | South Park Home Economics & Administration – Pittsburgh |
| G. C. Murphy Co. Farrell | South Penn Oil Co. Plant No 1 Rouseville |
| G. C. Murphy Co. Indiana | South Philadelphia High School – Philadelphia |
| G. C. Murphy Co. Johnsonburg | South Pittsburgh Water Co. – Pittsburgh |
| G. C. Murphy Co. Kittanning | South Pittsburgh Water Works – Pittsburgh |
| G. C. Murphy Co. McKeesport | South Ride – Pittsburgh |
| G. C. Murphy Co. Meadville | South Side Elementary School – Shippingport |
| G. C. Murphy Co. Monroeville | South Side Hospital – Pittsburgh |
| G. C. Murphy Co. New Kensington | South Side Plant – Pittsburgh |
| G. C. Murphy Co. Robinson Township | South Side Works Station #52-2332 Pittsburgh |
| G. C. Murphy Co. Uniontown | South Wilkes Barre Colliery South Wilkes Barre |
| G. C. Murphy Co. Whitehall | Southeastern Green School District – Greensboro |
| G. E. Industrial Tube Plant – Scranton | Southern Cambria Railway Co. – Southfork |
| G. E. Metropolitan Edison | Southern Cambria St. Railway Co. – Johnstown |
| G. E. Metropolitan Edison-Titus Station Turbine – Edison | Southern Cambria Street Railway Co. – Johnstown |
| G. Garrett & Sons – Philadelphia | Southern Cambria Street Railway Co. South Fork |
| G. K. Garrett Co. – Philadelphia | Southern Kraft Division International Paper Co. – York Haven |
| G. Ramsey & Sons – New Castle | Southern Manual Training School – Philadelphia |
| G. S. A – Harrisburg | Southern Natural Gas Co. – Pittsburgh |
| G. S. A. Harrisburg | Southern Nitrogen Co. – Port Wentworth |
| G. W. Allen Co. – Philadelphia | Southern Traction Co. – Pittsburgh |
| G. W. Allen Co. Philadelphia | Southmark Mills Co. – Philadelphia |
| G. W. Blabon Co. – Philadelphia | SouthPennsylvania Railroad |
| G. W. Childs Public Ledger Building – Philadelphia | Southside Works – Pittsburgh |
| G. W. Johnson Co. – New Castle | Southwark Foundry & Machine Co. – Philadelphia |
| G. W. Johnson Co. New Castle | Southwark Station – Philadelphia |
| GAF Corp. – Fullerton | SouthWater Co. – Connellsville |
| GAF Corp. Philadelphia | SouthWater Pollution Control Plant Philadelphia |
| GAF Corp. Ruberoid Erie | Spang & Co. – Butler |
| GAF Corp. Ruberoid Fullerton | Spang Chalfant & Co. Inc. – Pittsburgh |
| GAF. Corp. Industrial Prod. Division – Erie | Spang Chalfant Co. Inc. Sharpsburg |
| Gage Co. – Titusville | Spang Co. Butler |
| Gair Box – Philadelphia | Spang Co. Pittsburgh |
| Gallery Chemical Corp. Callery | Spang Steel & Iron Co. – Pittsburgh |
| Galvanized Steel Deck – Ambridge | Spangler High School – Spangler |
| Galveston – Philadelphia | Spano Painting Company Pittsburg |
| Garage Office Building | Spaug Chalfaut & Co. – Etna |
| Garden Spot Jr. High New Holland | Spear Carbon – St. Marys |
| Garden Spot Junior High – New Holland | Spearhead Cabinet Shop – Pittsburgh |
| Garden State Tanning Comp Fleetwood | Spearman Iron Co. – Sharpsville |
| Garfield Junior High School – Johnstown | Specialty Precision Wire Mt Carmel |
| Garland Brothers – Pittsburgh | Specialty Rings Products Cornwells Hgts |
| Garland Nut & Rivet Co. Pittsburgh | Specialty Steel – Braddock |
| Garman Mills Station – Possum Glory | Spector Freight System – Philadelphia |
| Garrett Co. – Ellwood City | Spectrum – Philadelphia |
| Garrick Theater – Philadelphia | Speer Carbon Building St Marys |
| Garvey Manor Nursing Home – Altoona | Speer Carbon Co. Bradford |
| Gas Plant Conshohoken | Speer Carbon Co. Speer Resistor Division Bradford |
| Gas Pumping Station – Bagdad | Speer Carbon Plant, St. Marys |
| Gateshirt Development Corp. Philadelphia | Speer Resistor Division Bradford |
| Gateway Center | Spicer Manufacturing Co. – Pottstown |
| Gateway Center Building #1-6 Pittsburgh | Spirax-SARCO Inc. – Allentown |
| Gateway Manufacturing – Masontown | Spirit Harley Davidson – Glenshaw |
| Gatx Corp. – Sharon | Spreckels Sugar Refining Co. – Philadelphia |
| Gautier Steel Department – Johnstown | Sprenger Brewing Co. – Lancaster |
| Gaylord Colliery – Plymouth | Spring & Forge – Latrobe |
| Gaylord Colliery Plymouth | Spring Brook Water Supply Co. – Scranton |
| Gaylords – Washington | Spring Forge – Latrobe |
| Gdula Coal Co. Dunlo | Spring Grove Paper Mill – Spring Grove |
| GE Erie | Spring Mill Manor – Ivyland |
| GE Pennsylvania Electric Turbine Repair Pittsburgh | Spring Siding |
| Ge Plant Philadelphia | Springdale Elementary School – Springdale |
| GE Transportation Systems Division Erie | Springdale Power Station – Cheswick Power Station |
| GE Transportation Systems Locomotive Plant – Erie | Springdale Power Station – Penn – Springdale |
| Geare-Marston, Inc. – Philadelphia | Springdale Power Station Unit #8 Springdale |
| Gee- Bee Dept. Store – Monaca | Springdale Powerhouse Springdale |
| Geisinger Medical Center – Danville | Springerie- Harbor Creek Road – Erie |
| Gem Manufacturing Co. – Pittsburgh | Spring-Ford Area High School – Royersford |
| Gen Alden Coal – Ashley | Springhill Suites- Marriott Pnc Park – Pittsburgh |
| Gen Engineering Works Inc – Philadelphia | Springs Cotton Mills – Lancaster |
| Gen Smelting & Ref Co. – Philadelphia | Springwell Foundry – Chester |
| General Al – Wilkes- Barre | SS Bertz Whse – Lancaster |
| General American Transport Corp. Sharon | SS Boiler House Station #30 – Pittsburgh |
| General American Transportation Corp. – Sharon | St Clair County Gas & Electric Co. – Philadelphia |
| General Cable Co. – Glenwillard | St Francis Hospital – Pittsburgh |
| General Carbice – Greensburg | St Joe Minerals – Josephtown |
| General Chemcial Co. Of Pennsylvania – Pittsburgh | St Joe Smelting – Monaca |
| General Chemical Co. Delaware Works Marcus Hook | St Joseph Lead Co. – Monaca |
| General Chemical Co. Maple Glen | St Margaret’s Hospital – Pittsburgh |
| General Chemical Co. Newell | St. Andrews School – Johnstown |
| General Chemical Co. Pittsburgh | St. Ann Monastery & Basilica, Scranton |
| General Chemical Division Newell | St. Ann Src Church – Castle Shannon |
| General Cooperage Philadelphia | St. Annes Home – Lancaster |
| General Dynamics Corp – Philadelphia | St. Anselm School – Swissvale |
| General Electric – Harrisburg | St. Anthonys School Exceptional Children – Oakmont |
| General Electric Co. Allentown | St. Augustine Church – Lawrenceville |
| General Electric Co. Bridgeville | St. Barnabus – Gibsonia |
| General Electric Co. Courtney | St. Benedict School – Giestown |
| General Electric Co. Erie | St. Bernard’s Church – Mt. Lebanon |
| General Electric Co. King of Prussia | St. Bernard’s Roman Catholic Church |
| General Electric Co. Kittanning | St. Bernard’s Roman Catholic Church – Pittsburgh |
| General Electric Co. Mifflin | St. Camillus – New Castle |
| General Electric Co. New Kensington | St. Charles – Parma, OH |
| General Electric Co. Philadelphia | St. Charles Seminary – Overbrook |
| General Electric Co. Plant King of Prussia | St. Clair Coal Co. St. Clair |
| General Electric Co. Stroudsburg | St. Clair Elementary – Pittsburgh |
| General Electric Co. Switchgear Plant Philadelphia | St. Clair Power Plant – Pittsburgh |
| General Electric Co. Warehouse Philadelphia | St. Colman Convent – Turtle Creek |
| General Electric Lamp Department Bridgeville | St. Corr Inst. At Huntingdon – Huntingdon |
| General Electric Manufacturing Plant | St. Corrections Institute at Huntingdon |
| General Electric Manufacturing Plant – Philadelphia | St. Edmunds School – Shadyside |
| General Electric Plant – Canonsburg | St. Elizabeth Convent – Cornwell Heights |
| General Electric Re- Entry Systems Philadelphia | St. Francis Hospital – Pittsburgh |
| General Engineering Works, Inc. – Philadelphia | St. Gabriels School – Whitehall |
| General Hospital Monongalia | St. George Church Aliquippa |
| General Hospital Stroudsburg | St. Germaine School – Bethel Park |
| General Hospital Wilkes Barre | St. Hubert’s Convent – Philadelphia |
| General Ionics Corp. – Bridgeville | St. James Activity Building – Pittsburgh |
| General Marketing Services Pittsburgh | St. James Episcopal Church – Lancaster |
| General Motors Corp. – Mifflin | St. Joe Lead Co. Freedom |
| General Motors Corp. – Pittsburgh | St. Joe Lead Co. Johnstown |
| General Nutrition Center – Natrona Heights | St. Joe Lead Co. Monaca |
| General Pershing Hotel – Dubois | St. Joe Mineral Corp. Monaca |
| General Refr Corp – Philadelphia | St. Joe Resources Co. – Josephtown |
| General Refractories Co. Philadelphia | St. Joe Smelting Monaca |
| General Refractories Co. Sproul | St. Joe Zinc Corp. Of America Monaca |
| General Refractories Mt. Union | St. John Lutheran Church – McKeesport |
| General Ribbon Mills, Inc. – Catasauqua | St. Johns Church – Delmont |
| General Ribbon Mills, Inc. | St. Johns General Hospital – Pittsburgh |
| General Smelting & Refining Co. – Philadelphia | St. Johns School – Baden |
| General Steel – Avonmore | St. Joseph Hospital Lancaster |
| General Steel Castings Avanmore | St. Joseph Lead Co. 71 Monaca |
| General Steel Castings Bodyston | St. Joseph Lead Co. Josephtown |
| General Steel Castings Eddystone | St. Joseph Lead Co. Monaca |
| General Supply Co. Coplay | St. Joseph Minerals Zinc Smelter – Monaca |
| General Textile Mills – Philadelphia | St. Joseph’s Academy – Greensburg |
| General Tire & Rubber Co. – Jeannette | St. Josephs Church – Clairton |
| General Tire Rubber Chemicals Plastic Div. Jeannette | St. Josephs Dorseyville |
| Generation Stores Engleside Service Depot Lancaster | St. Joseph’s Hospital – Reading |
| Gene’s Garage – Philadelphia | St. Josephs New Castle |
| Genettis Supermarket – Shenandoah | St. Louis Die Casting Corp. Ripley |
| Geneva College – Beaver Falls | St. Louis Plate Glass Co. – Pittsburgh |
| Gen’L Chemical Co. Of Penna – Pittsburgh | St. Luke’s Hospital – Bethlehem |
| Gentex Corp. – Carbondale | St. Margaret Hospital – Pittsburgh |
| Geo A Smith & Co. – Philadelphia | St. Mark’s School – Altoona |
| Geo K Garrett Co. Inc – Philadelphia | St. Marys Church – Altoona |
| Geo M Newhall Eng & Co. – Philadelphia | St. Marys Church – Charleroi |
| Geo Westinghouse Jr. – Pittsburgh | St. Marys Elementary School – McKeesport |
| Geo. F. Moilers Co. – Gettysburg | St. Mary’s Laundry – Ardmore |
| Geo. F. Uber Co. – Philadelphia | St. Nicholas Building – Pittsburgh |
| Geo. M. Newhall Engineering Co. – Philadelphia | St. Patricks Church – Canonsburg |
| Geo. S. Harris & Sons – Philadelphia | St. Paul’s Church – Philadelphia |
| Geo. Sall Metals – Philadelphia | St. Paul’s Roman Catholic Orphan Asylum – Idlewood |
| George A. Fuller Contracting Co. – Philadelphia | St. Pius Elementary School – McKeesport |
| George A. Smith & Co. – Philadelphia | St. Pius X Seminary – Dalton |
| George F. Uber Co. – Philadelphia | St. Raphaels Church – McKeesport |
| George H. Walbridge Lackawanna Light Co. – Scranton | St. Regis – Champion – International Paper – Paper Mill |
| George Hasbrook Farms – Titusville | St. Regis Paper – York |
| George Hasley & Sons Allegheny | St. VIncent School & Rectory – Plymouth |
| George I. Bodine, Trustee Philadelphia | St. Wendelins High School – Butler |
| George K Garrett Co. Inc M – Philadelphia | Stackpole Carbon – Saint Marys |
| George M. Newhall Engineering Co. – Philadelphia | Stackpole Carbon Plant – Kone |
| George Pottash & Co. Philadelphia | Staggerson Dam Stevenson Dam – Cameron County |
| George S. Harris & Sons – Philadelphia | Stagmaier Brewing Co. – Wilkes Barre |
| George Sall Metals Co. – Philadelphia | Staley Starch – Philadelphia |
| George School – Bucks County | Staley Syrups – Morrisville |
| George Singleton – Scranton | Stanbridge Apartments – Lansdale |
| George V Hamilton Inc. McKees Rock | Standard Box Pittsburgh |
| George V. Cresson – Philadelphia | Standard Chair Co. – Union City |
| George V. Hamilton, Inc. – McKees Rocks | Standard Floor Co. – Pittsburgh |
| George W. Blabon Co. Nicetown, Philadelphia | Standard Ice Manufacturing Co. – Philadelphia |
| George Westinghouse Jr. – Pittsburgh | Standard Life Insurance Building – Pittsburgh |
| Georgetown Sand & Gravel – Georgetown | Standard Oil Co. Atlantic Refinery Philadelphia |
| Georgia Pacific Pulp & Paper – Reading | Standard Oil Co. Philadelphia |
| Georgia Power Co. Waynesboro | Standard Oil Co. Steelton |
| Georgia-Pacific Corp. Pulp Paper Reading | Standard Oil Tank – Philadelphia |
| Georgia-Pacific Corp. Reading | Standard Plant – Ellwood City |
| Gerace Hill Boiler & Bur Philadelphia | Standard Plastics – Fogelsville |
| Gerace William Philadelphia | Standard Press Steel Co. – Jenkinstown |
| Gerard Trust Building – Philadelphia | Standard Register Co. – Bedford |
| German Hospital – Philadelphia | Standard Sanitary Manufacturing Co. – New Brighton |
| Germantown District High School – Philadelphia | Standard Scale & Supply Co. – Beaver Falls |
| Germantown Hospital – Philadelphia | Standard Seamless Tube Co. – Economy |
| Germantown Jct – Philadelphia | Standard Steel – Lewistown |
| Germantown Jewish Center – Philadelphia | Standard Steel Car Co. – Butler |
| Germantown Junction – Philadelphia | Standard Steel Car Co. Pittsburgh |
| Germantown Philadelphia | Standard Steel Car Co. Renfrew |
| Germantown YMCA – Philadelphia | Standard Steel Division, Burnham |
| GES Circulating Fluid Bed Plant | Standard Steel Lewiston |
| Gettysburg College – Gettysburg | Standard Steel Specialty Beaver Falls |
| Gettysburg High School – Gettysburg | Standard Steel Spring – Coraopolis |
| Gettysburg PA Schindler Elevators | Standard Steel Works Co. – Philadelphia |
| GFS Shop – Carnegie | Standard Steel Works Division Burnham |
| Gherardi – Philadelphia | Standard Tin Plate Co. – Canonsburg |
| Giant Eagle – Ebensburgh | Standard Underground Cable Co. – Pittsburgh |
| Giant Eagle – Etna | Stanley Electric Altoona |
| Giant Eagle – New Brighton | Stanley G Flagg & Co. – Pottstown |
| Giant Eagle – New Kensington | Stanley Spring Works Inc. Harrisburg |
| Giant Eagle – Turtle Creek | Stanton Colliery – Ashley |
| Giant Eagle – View | Stanwix Heating Plant – Pittsburgh |
| Giant Portland Cement Co. – Egypt | Stanwix Plant Pittsburgh |
| Gibson & Sons, Inc. – Philadelphia | Stanzel Alfred Cryodon |
| Gibson Electric Co. – Delmont | Star Fire Brick Co. – Pittsburgh |
| Gilbert Associates, Inc. – Reading | Starr Stores Warehouse – Philadelphia |
| Gill Hauck – Bradford | State Capital Building – Harrisburg |
| Gimbels Dept. Store – Monroeville Mall – Monroeville | State Childrens Home – Ebensburg |
| Gimbels Dept. Store – Pittsburgh | State College – Altoona |
| Gimbels Dept. Store – South Hills Village | State College Presbyterian Church – State College |
| Gimbels Store – Philadelphia | State Correctional Institute – Camp Hill |
| Gipsey Grove Colliery – Dunmore | State Correctional Institute – Frackville |
| Girard Coal Co. – Mt. Carmel | State Correctional Institute – Houtzdale |
| Girard Coal Co. Pittston | State Correctional Institution – Camp Hill |
| Girard College – Philadelphia | State Employment Office – Altoona |
| Girard Estate Peoples Bank – Philadelphia | State Hospital – Somerset |
| Girard Estate Philadelphia | State Hospital for The Insane – Norristown |
| Girard Gollege – Philadelphia | State Institution – Polk |
| Girard Point Lpg Recv & Caustic Reg – Philadelphia | State Line Painting – New Bedford |
| Girard Point Philadelphia | State Liquor – Youngwood |
| Girard Point Refinery Gate #24 Philadelphia | State Office Building |
| Girard Refinery – Philadelphia | State Office Building, Commonwealth Ave. & Foster St. – Harrisburg |
| Girard Trust Co. Building Philadelphia | State Police Barracks – Punxsutawney |
| Girls Normal School – Philadelphia | State Police Office- Capitol Building – Harrisburg |
| Girrard College – Philadelphia | State School – Ebenburg |
| Girton Manufacturing Co. – Millville | State Teachers College – Clarion |
| Gladwyne College – Gladwyne | Station “B” Works – Philadelphia |
| Glasgow Iron Co. – Pottstown | Station J – Tacony |
| Glass Containers Corp. – Knox | Stauffer C Dan Ingomar |
| Glass Containers Corp. Marienville | Stauffer Chemical Co. – Maple Glen |
| Glass Containers Corp. Parker | Stauffer Chemical Co. Inc. – Frye Station |
| Glassine Paper Co. Conshohocken | Stauffer Chemical Co. Marcus Hook |
| Glassmere Casting Co. – Creighton | Stauffer Chemical Co. Morrisville |
| Glassport Tennis Courts – Glassport | Stauffer Chemical Plant Monongahela |
| Glastic Corp. – Jefferson | Stawbridge & Clothier – Philadelphia |
| Glatfelter Paper Mill – Spring Grove | Steam Generator Sales Service – Coatesville |
| Glatfelter Pulp & Paper Mill – Spring City | Steel Car Forge Co – Ellwood City |
| Glen Alden Coal Ashley | Steel Car Forge Co. – Butler |
| Glen Alden Coal Co. Audenreid | Steel Car Forge Co. Ellwood City |
| Glen Alden Coal Co. Buttonwood | Steel City Lumber Co. – Ambridge |
| Glen Alden Coal Co. Maxwell Colliery Scranton | Steel Mill – Allaquepa |
| Glen Alden Coal Co. Nanticoke | Steel Mill – Clearfield |
| Glen Alden Coal Co. Plymouth | Steel Works Duquesne Works Duquesne |
| Glen Alden Coal Co. South Wilkes Barre | Steele Elementary School – Philadelphia |
| Glen Alden Coal Co. Station Colliery Ashley | Steelite Corp. – Wheatland |
| Glen Gery Shade Brick Shillington | Steelton & Highspire Railroad Co. – Bethlehem |
| Glen Gery Shale Brick Corp. – Harrisburg | Stefanak Co. Farrell |
| Glen Gery Shale Brick Corp. Ephrata | Stegmaier Brewing Co. Wilkes Barre |
| Glen Gery Shale Brick Corp. Harrisburg | Stemerich Garage – Slippery Rock |
| Glen Gery Shale Brick Corp. Watsontown | Stephen Girard Building – Philadelphia |
| Glen Summit Hotel & Land Co. – Glen Summit | Sterling Land Co. Pittsburgh |
| Glen Summit Spring Siding | Sterling Metal Philadelphia |
| Glen Willow Ice Manufacturing Co. Manayunk – Philadelphia | Sterling Silk Glove Co. – Bangor |
| Glen Wilton Co. | Stern & Silverman – Philadelphia |
| Glenn M. Baker Heating & Plumbing – Huntingdon | Stern Jacob & Sons Jenkintown |
| Glenolden – Glenfield | Sterrick Creek Coal Co. – Scranton |
| Glenshaw Glass Co – Glenshaw | Stevenson Dam – Cameron County |
| Glenwood Station – Pittsburgh | Stevenson Motors – Greenville |
| Glidden Metals – Johnstown | Stevenson Terrace Apartments – Philadelphia |
| Glidden-Durkee – Johnstown | Stick Trailers – Fairless Hills |
| Globe Automatic Sprinkler System – Philadelphia | Stick Trailers |
| Globe Dye Works Co. – Philadelphia | Stilltronics – Oakmont |
| Globe Eye Works – Philadelphia | Stirling Sintering Co. South Heights |
| Globe Plastic Co. Croydon | Stone & Webster Engineering – Wiliamsport |
| Globe Rubber Co. – Philadelphia | Stone Canyon Consolidated Coal Co. – Wilkes Barre |
| Globe Ticket Co. Philadelphia | Stone Container Corp. Philadelphia |
| Glp Co. – Philadelphia | Stone Container Corp. St. Regis Paper York |
| Glyco Chemicals Division – Wiliamsport | Stone Quarry – Greenville |
| GM W. Mifflin Boro Pittsburgh | Stone Webster Engineering Corp. Williamsport |
| Gnex Inc – Erie | Stoner-Mudge – Rochester |
| Gold Bond Building Products – Milton | Stores Department – Beaver Falls |
| Gold Bond Building Products Milton | Stores Department Beaver Falls |
| Golden Hills Nursing Home – New Castle | Stouffers Plant King of Prussia |
| Goldsmith Building – Philadelphia | Strand Township – Stroudsburg |
| Goldsteins & Sons, Inc. – Philadelphia | Strand Township Monroe Co. Stroudsburg |
| Golf Tower – Pittsburgh | Stratton Motor Co. – Clearfield |
| Good Shepherd Church – New Castle | Straub Brewing – Pittsburgh |
| Good Shepherd Roman Catholic Parish – Camp Hill | Straub Brewing Pittsburgh |
| Goodyear – Grove City | Strawbridge & Clother Department Store – Germantown |
| Goodyear Tire & Rubber Co. – Connellsville | Strawbridge & Clothier – Philadelphia |
| Gordon Strobel & Lawreau – Philadelphia | Strick Trailers Fairless Hills |
| Gottery – Erie | Stricklands Hotel – Mt. Pocono |
| Governor’s Mansion – Harrisburg | Stroudsburg State Teachers College Boiler House Stroudsburg |
| Governor’s Mansion Harrisburg | Struthers & Wells – Titusville |
| Gpu Nuclear Corp. 3 Mile Island Power Plant | Struthers Coal & Coke Co. – New Salem |
| Gpu Nuclear Corp. Three Mile Island Unit Harrisburg | Struthers Scientific Warren |
| Grace Mines Cornwall | Struthers Station – Warren |
| Grace Mines Morgantown | Struthers Wells Corp. Warren |
| Gracedale Country Home – Allentown | Suburban Hospital – Monroeville |
| Graceton & Coral Coal Co. – Graceton | Suburban Plant – Scranton |
| Graham Foundry & Machine Co. – Monongahela | Suburban Propane – Lancaster |
| Graham Jean Malvern | Suburban Rapid Trans. Lt Railway Co. – Pittsburgh |
| Grain Elevator & Storage Co. | Suburban Rapid Transit Street Railway Co. – Pittsburgh |
| Gram Asbestos Co. – Erie | Suburban Water Co. – Hulton |
| Gramar Construction Moon Township | Sugar Apparatus Manufacturing Co. – Philadelphia |
| Gramham Jean Malvern | Sugar Refining & Molasses Co. Philadelphia |
| Grand Insulation – Philadelphia | Sui Gas Purification Plant Karachi |
| Grandview Nursing Home – Clarion | Sui Gas Purification Plant Sui |
| Granite City Steel Co. Pittsburgh | Sullifoam Willow Grove |
| Granite Hosiery Mills – Souderton | Sullivan Products Willow Grove |
| Grant Station – Pittsburgh | Sulzberger Junior High – Philadelphia |
| Grant Steel – Duquesne | Summerdale Dye & Fin Inc – Philadelphia |
| Grant Towers – Duquesne | Summerdale Dye & Finishing Inc. – Philadelphia |
| Grantley Rd York County – York | Summerdale Dye Fin Inc. Philadelphia |
| Grantley Road, York County – York | Summit Branch Mining Co. – Williamstown |
| Granview Hospital Sellersville | Summit Branch Railroad Co. – Wilkes Barre |
| Grape Products Co. – North East | Summit Park Apartments – Philadelphia |
| Graphite Bronze – McConnellsville | Sun Co. Inc. – Oregon |
| Grasselli Powder Co. – Wyside | Sun Co. Inc. Philadelphia |
| Gratz & Gillespie School – Philadelphia | Sun Co. Inc. Refinery Marcus Hook |
| Grays Ferry Cogeneration Part – Philadelphia | Sun Company, Inc. Refinery – Maple Glen |
| Grays Ferry Cogeneration Partnership Philadelphia | Sun Gas Station – Bellefonte |
| Grays Ferry Road & Carpenter St. – Philadelphia | Sun Oil – Chester |
| Great Lakes Steel Corp. Pittsburgh | Sun Oil – Sunoco Refinery – Lester |
| Greater Pittsburgh Airport – Pittsburgh | Sun Oil Co. – Maple Glen |
| Gree Inc. Erie | Sun Oil Co. 17- 13 Ammonia Plant Warehouse Marcus Hook |
| Green Bag Cement – Nequehoning | Sun Oil Co. Chester |
| Green Ridge Coal Co. – Scranton | Sun Oil Co. Flare Tower Marcus Hook |
| Green Spring Co. – Philadelphia | Sun Oil Co. Marcus Hook Refinery Marcus Hook |
| Green Tweed – North Wales | Sun Oil Co. Oaks |
| Greencastle Packing Co. – Greencastle | Sun Oil Co. of Pennsylvania |
| Greene County Detention Home – Greene County | Sun Oil Co. Philadelphia |
| Greene County Hospital – Waynesburg | Sun Oil Co. Toledo |
| Greene County Prison – Greene County | Sun Oil Co. Twin Oaks Warehouse #3 Twin Oaks |
| Greene Middle School – Waynesburg | Sun Oil Co. Twin Oaks Warehouse Twin Oaks |
| Greene, Tweed & Co. – Palmetto Packings | Sun Oil Co. Warehouse Twin Oaks |
| Greengate Mall Greensburg | Sun Oil Plant – Maple Glen |
| Greensburg Central Catholic High School – Greensburg | Sun Oil Storage Tank Marcus Hook |
| Greensburg- Connellsville Coal Coke Co. Burgettstown | Sun Oil-Sunoco Refinery |
| Greensburg Country Club – Greensburg | Sun Petroleum Co. – Maple Glen |
| Greensburg Hospital – Greensburg | Sun Refining & Marketing Co. – Philadelphia |
| Greensburg Recorder of Deeds Greensburg | Sun Shipbuilding & Drydock Co. – Chester |
| Greensburg-Connellsville Coal & Coke Co. – Burgettstown | Sun Shipbuilding & Drydock Co. Pennship Chester |
| Greenville Hospital – Greenville | Sun Shipbuilding & Drydock Co. Philadelphia |
| Greenville Power Station – Greenville | Sun Shipbuilding Shipyard – Chester |
| Greenville Steel Car Co. Plant Greenville | Sun Shipbuilding Shipyard Scott Paper Mill – Delta |
| Greenville Tube Div. Emerson Greenville | Sun Transport Co. – Chester |
| Greenway Manufacturing – Nemacolin | Sunbeam Corp. Meadville |
| Greenwich Collieries Barnesboro | Sunbeam Equipment Co. – Meadville |
| Greyhound Bus Terminal – Philadelphia | Sunbeam Plant – Meadville |
| Grief Brothers Containers Washington | Sunbury & Northumberland Electric – Sunbury |
| Grief Brothers Washington | Sunbury Converting Works Sunbury |
| Griffin Dodge Cochranton | Sunbury High School – Butler |
| Griffin Emanuel Brick Co. – Peukiomen | Sunbury Steam Station Shamokin Dam |
| Grimme Combustion Inc. Don Philadelphia | Sunny Slopes – Phillipsburg |
| Grimms – Sharon | Sunoco – Munhall |
| Grinding Feed Sheridan | Sunoco Chemical Inc. – Philadelphia |
| Grinnell Co. Inc. – Columbia | Sunoco Frazier Blvd – Homewood |
| Grinnell Corp. Columbia | Sunoco Inc Point Breeze – Philadelphia |
| Griswold Worsted Co. – Darby | Sunoco Pennsylvania – Pittsburgh |
| Grit Publishing Co. – Williamsport | Sunoco Philadelphia – Philadelphia |
| Grocer’s Sugar House – Philadelphia | Sunoco Refining & Marketing Marcus Hook |
| Grosglass – Beaver Falls | Sunoco Rm Point Breeze Philadelphia |
| Grosglass- 27Th Street Plant – Beaver Falls | Sunoco Station – Beaver |
| Grove City College – Grove City | Sunoco Washington Blvd – Washington |
| Grove City Elementary – Grove City | Sunship Drydock Co. Chester |
| Grove City- Sewage Treatment Plant – Grove City | Sunship-Pennship Chester |
| Grover Cleveland Public School – Philadelphia | Superintendent U. S. Mint Philadelphia |
| Grover Farms, Inc. – Grover | Superior Boiler Equipment Co. Ardmore |
| GSA – Harrisburg | Superior Builders Supply Co. – Baden |
| Guam Co. Philadelphia | Superior Builders Supply Co. Baden |
| Guaranty Silk Corp. – Nanticoke | Superior Combustion Industries Emmaus |
| Guardian Encr & Dev Co. – Carnegie | Superior Draw Aliquippa |
| Gulf Chemical Neville Island | Superior Drawn Steel Co. – Monaca |
| Gulf Chevron Oil Refinery-Philadelphia | Superior Fireproof Door & Sash – Scranton |
| Gulf Chevron Refinery – Philadelphia | Superior Lumber Co. Baden |
| Gulf Oil Corp. #4 Boiler House Philadelphia | Superior Steel Corp. – Carnegie |
| Gulf Oil Corp. Cool House #491 Chlor Building #492 Girard Point | Superior Thread & Yarn Co. – Philadelphia |
| Gulf Oil Corp. Cooling Water Pump House #491 Girard Point | Superior Zinc Corp. – Bristol |
| Gulf Oil Corp. Cooling Water Pump House #491 Philadelphia | Supervalu – New Stanton |
| Gulf Oil Corp. Gate #24 Girard Point | Supplee Memorial Presbyterian Church – Maple Glen |
| Gulf Oil Corp. Gate #24 Philadelphia | Supradur – Windgap |
| Gulf Oil Corp. Girard Point Refinery Philadelphia | Surface Chemicals Inc.- Metals Division – Forbes Road |
| Gulf Oil Corp. Girard Point | Surface Combustion Scranton |
| Gulf Oil Corp. Neville Island | Surpass Leather Co. – Philadelphia |
| Gulf Oil Corp. Number 3 Boiler House Philadelphia | Susquehanna Coal Co. – Nanticoke |
| Gulf Oil Corp. Philadelphia Refinery #4 Boiler House Philadelphia | Susquehanna Coal Co. Newport Centre #4 Shaft |
| Gulf Oil Corp. Philadelphia Refinery 15# Steam Replacement Philadelphia | Susquehanna Coal Co. Stearns |
| Gulf Oil Corp. Philadelphia Refinery Gate No. 24 Philadelphia | Susquehanna Coal Co. Wilkes Barre |
| Gulf Oil Corp. Philadelphia | Susquehanna Collieries Co. – Mt. Carmel |
| Gulf Oil Corp. Pittsburgh | Susquehanna Ordnance Works Allentown |
| Gulf Oil Corp. Sulphur Unit Philadelphia Refinery Philadelphia | Susquehanna Power Station Shawville Station |
| Gulf Oil Corp. Visa Breaker Unit Philadelphia | Susquehanna Silk Mills Huntington |
| Gulf Oil Gas Station – Presto | Susquehanna Silk Mills Jersey Shore |
| Gulf Oil Refinery Girard Point | Susquehanna Silk Mills Sunbury |
| Gulf Oil Refinery Philadelphia | Susquehanna Steam Power Station – Berwick |
| Gulf Oil Refinery Pittsburgh | Susquehanna University Womens Mens Dormitories Selinsgrove |
| Gulf Refining Co. Girard Point | Susquehannock High School – Glen Rock |
| Gulf Refining Co. Pittsburgh | Sustek Paul Co. Inc. Philly |
| Gulf Research & Development – Cheswick | Swan Trucking |
| Gulf Research & Development Co. – Harmarville | Swanee Paper Mill – Ransom |
| Gulf Research & Development Co. – Pittsburgh | Swanee Potlach Power Station – Ransom |
| Gulf Research Development Cheswick | Swank Refractories – Johnstown |
| Gulph Woolen Mills – Gulph | Swarthmore College – Swarthmore |
| Gultendolf Press – Cranberry | Swarthmore Street Railway |
| Gun Plant #269 Philadelphia | Swees Steel Co. Williamsburg |
| Gw Allen & Co. – Philadelphia | Sweet’s Steel – Wiliamsport |
| H Miller Spring & Manufacturing Co. Pittsburgh | Swift & Co. – Chambersburg |
| H. A. Diffenbach – Philadelphia | Swindell-Dressler Co. – Pittsburgh |
| H. Blinderman & Son – Hellerstown | Swing & Bateman – Philadelphia |
| H. C. Frick Coke Co. Brownfield | Swobe & Deane Pontiac Buick – Ambridge |
| H. C. Frick Coke Co. Bute Station | Sykesville Coke Co. Sykesville, Jefferson County |
| H. C. Frick Coke Co. Calumet | Sylvania Electric Product Co. – York |
| H. C. Frick Coke Co. Colbers Mine | Sylvania Electric Products, Inc. Emporium |
| H. C. Frick Coke Co. Dearth Mines | Sylvania Sylvania Electric Co. Warren |
| H. C. Frick Coke Co. Lambert | Syntex Corp. – Allentown |
| H. C. Frick Coke Co. Leith | Synthane Corp. – Oaks |
| H. C. Frick Coke Co. Monarch | Synthane- Taylor Corp. Taylor Fibre Norristown |
| H. C. Frick Coke Co. Monmouth | Synthane-Taylor Corp. |
| H. C. Frick Coke Co. Mt. Pleasant Station | Syria Mosque – Oakland |
| H. C. Frick Coke Co. Phillips Mine | T. C. Roberts & Co. – Philadelphia |
| H. C. Frick Coke Co. Pittsburgh | T. C. Roberts & Co. Philadelphia |
| H. C. Frick Coke Co. Ronco | T. K. King Plumbing Shop – Beaver Falls |
| H. C. Frick Coke Co. Rowes Run Station | Tacony Chemical Works – Philadelphia |
| H. C. Frick Coke Co. Rowes Run | Tacony Iron & Metal Co. – Tacony |
| H. C. Frick Coke Co. Trotter | Tacony Ordnance Corp. – Tacony |
| H. C. Frick Coke Co. Union Station | Talbot – Philadelphia |
| H. C. Frick Coke Co. United Station | Talco Metal Products Co. – Philadelphia |
| H. C. Frick Coke Co. Walnut Hill | Talco Metals Co. – Philadelphia |
| H. C. Frick Coke Co. Westmoreland County | Talon Federated Fund Meadville |
| H. C. Frick Coke Co. York Run | Tamaqua Area High School – Tamaqua |
| H. C. Price Co. – Philadelphia | Tamaqua Colliery – Tamaqua |
| H. C. Trick Coke Co. – Pittsburgh | Tamaqua Colliery Tamaqua |
| H. D. Justi Division – Philadelphia | Tapper Supply Co. Hazleton |
| H. Daroff & Sons – Philadelphia | Tar Products Div. – New Norristown |
| H. E. Brosius Kittanning | Tarentum Housing – Tarentum |
| H. E. Colliery – Bennett | Tarentum Light & Water Plant – Tarentum |
| H. F. Watson Co. – Erie | Tarentum Light Plant Tarentum |
| H. H. Brosius – Kittanning | Tarentum Paper Mills – Tarentum |
| H. H. Chrowder Co. – Allentown | Tarinto Monument Works – Lehigh County |
| H. H. Curry Co. – Pittsburgh | Tasty Baking Co. – Philadelphia |
| H. H. Heinz Laboratory Pittsburgh | Tasty Baking Co. Hunting Park Avenue Philadelphia |
| H. H. Robertson Co – Ambridge | Tasty Baking Co. Inc. – Philadelphia |
| H. H. Robertson Co. – Pittsburgh | Tate Jones & Co. Inc. – Pittsburgh |
| H. J. Heinz & Co. – Chambersburg | Tate Jones Co. – Beaver Falls |
| H. J. Heinz & Co. – Pittsburgh | Tavern Lodge – New Wilmington |
| H. J. Heinz & Co. Allegheny | Taws & Hartman – Philadelphia |
| H. J. Heinz & Co. Chambersburg | Taylor Fibre – Norristown |
| H. J. Heinz & Co. Pittsburgh | Taylor Forge & Pipe Works – Carnegie |
| H. J. Heinz & Co. Plumbing Dept Pittsburgh | Taylor Forge Pipe Works Carnegie |
| H. J. Heinz & Co. Stock Room Pittsburgh | Taylor-Wharton Iron & Steel Co. – Easton |
| H. J. Heinz Manufacturing Plant – Pittsburgh | Tech Building Metzler Church Rd Brownstown |
| H. J. Hines Pittsburgh | Tech Food Products Co. – Pittsburgh |
| H. J. Hines Research Labs Pittsburgh | Techaid Co. Monroeville |
| H. Julius Klingler & Co. – Butler | Teledyne Columbia- Summerhill Scottsdale |
| H. K. Crimming Tradesman Grain Elevator & Storage Co. – Philadelphia | Teledyne Firth-Sterling McKeesport |
| H. K. Drumming Tradesman Grain Elevator & Storage Co. | Teledyne Firth-Sterling Trafford |
| H. K. Horter & Co. – Pittsburgh | Teledyne Vasco. Monaca |
| H. K. Mulford Plant | Teledyne, Inc. – Waynesboro |
| H. K. Porter & Co. Pittsburgh | Temple Boiler – Philadelphia |
| H. Koppers Co. New Castle | Temple Covenant of Peace – Easton |
| H. Koppers Co. Pittsburgh | Temple Hospital – Philadelphia |
| H. L. Edwards & Co. – Philadelphia | Temple Iron Co. Bennett |
| H. L. Frick Coke Co. – Pittsburgh | Temple Iron Co. Forty Fort |
| H. P. Kinsey Easton | Temple Iron Co. Peckville |
| H. R. Curry Co, Inc. – Pittsburgh | Temple Iron Co. Reading |
| H. T. Horst Construction Co. Reading | Temple Iron Co. Scranton |
| H. T. Osburn & Company, Inc. Franklin | Temple Iron Co. Temple |
| H. T. Watson Co. Erie | Temple Iron Co. Wyoming |
| H. W. Butterworth & Sons – Philadelphia | Temple University |
| H. W. Oliver Central Power Plant – Pittsburgh | Temple University – Philadelphia |
| H. W. Oliver’s Central Power Plant – Pittsburgh | Temple University Hospital – Philadelphia |
| H. Westhoff- Florist – Hoffman Station | Temple University Life Bio- Sciences Building Philadelphia |
| H.J. Heinz Manufacturing Plant | Temple University Medical School Philadelphia |
| H.K. Mulford Plant – Philadelphia | Temple University Mental Health Facility – Philadelphia |
| Hackmeister Co. – McKees Rocks | TenneCo. Plant – Pasadena Plant |
| Hadden Steel Co. – Cupola | Tennessee Gas Mercer |
| Haemer Tool – Saegertown | Tere Woodring & Co. – Hazleton |
| Hafleigh & Co. – Philadelphia | Tetsner Dyeing Co. – Philadelphia |
| Hahn Louis & Sons Pittsburgh | Texas Co – Maple Glen |
| Hahnemann Hospital – Philadelphia | Texas Co. Marcus Hook |
| Hainsworth Steel Co. – Pittsburgh | Textile Machine Works – Reading |
| Hajoca Building – Philadelphia | Textron, Inc. Providence |
| Hajoca Building Ground Floor Philadelphia | Thaddeus Stevens Industrial School – Lancaster |
| Hajoca Building Philadelphia | Thaddeus- Stevens School – New Castle |
| Hale Building – Philadelphia | Thalheimer Brothers Inc – Philadelphia |
| Hall & Garrison – Philadelphia | The American Pulley Co. – Philadelphia |
| Hall Station – Monroeville | The Board of Public Education Center Pittsburgh |
| Hallmor Co. – Bethel Park | The Budd Co. – Philadelphia |
| Halstead Metal Products, Inc. Zelienople | The Budd Co. Philadelphia |
| Haltenback & Stephens – Allentown | The Cincinnati Gasket Packing & Mfg. Inc. |
| Hamburg State School – Hamburg | The Federal Building – Pittsburgh |
| Hameraschlag Hall Pittsburgh | The Guy S Haak Builders Franklin |
| Hamilton Construction Philadelphia | The Hill School – Pottstown |
| Hamilton George V Inc. McKees Rock | The May Department Stores Co. – Pittsburgh |
| Hamilton Watch Co. – Lancaster | The Mercersburg Academy – Mercersburg |
| Hammerhill Aliquippa | The Mercersburg Academy |
| Hammermill Paper – Lock Haven | The Mercersburg Academy Mercersburg |
| Hammermill Paper Co. – Erie | The O. Hommel Co. Carnegie |
| Hammermill Paper Co. Lock Haven | The Patterson-Kelley Co, Inc. – Stroudsburg |
| Hammermill Paper Mill – Erie | The Pennsylvania Water Co. Nadine |
| Hammond Ironworks Warren | The Philip Carey Manufacturing Corp. – Philadelphia |
| Hamont Medical Center – Erie | The Pierce Glass Co. Port Allegany |
| Hamot Hospital – Erie | The Spring Cotton Mills – Lancaster |
| Hamot Medical Center – Erie | The Spring Cotton Mills |
| Hampton Boiler Plant – Scranton | The U G I Corp. – Harrisburg |
| Hampton Central Elementary School – Allision Park | The U G I Corp. Harrisburg |
| Hampton High School – Allison Park | The U G I Corp. Reading |
| Hampton Mines – Scranton | Theater Workers Union – Local 8 – Philadelphia |
| Handshuh Joe Builder Roslyn | Theodore E. Moser – Philadelphia |
| Handy & Harman Tube Co. – Norristown | Theodore Presser Yeadon |
| Handy Harman Tube Co. Norristown | Thermal Engineering Inc – Lehigh County |
| Haneys Furniture New Castle | Thermal Engineering Inc. – Allentown |
| Hanford Nuclear Powerhouse – Hanford | Thermal Industries – Wilkinsburg |
| Hanford Ordinance Works – Hanford | Thermal Refractories Co. – Chester |
| Hanlon & Wilson Co. Jeanette | Thermal Research Engineering Conshohocken |
| Hanlon Electric Co. Monroeville | Thermal Transfer Corp. – Monroeville |
| Hanlonwilson Machine Shop – Wilkinsburg | Therman Candy Co. – McKeesport |
| Hannastown Plant Coal & Coke Hannastown | TherMax Co. Kennett Square |
| Hanover Industrial Park – Hanover | Thomas Dolan & Co. – Philadelphia |
| Hanover Power Co. – Hanover | Thomas F. Deegan Philadelphia |
| Happenstall Co. – Pittsburgh | Thomas H. Grigg Philadelphia |
| Happy Day Laundry Pittsburgh | Thomas Iron Co. – Hellerstown |
| Harbison Walker Refractories Co. – Chester | Thomas Iron Co. Alburtis |
| Harbison-Walker Garber Research Center – Mifflin | Thomas Iron Co. Hokendauqua |
| Harbison-Walker Mifflin | Thomas Jaggers – Philadelphia |
| Harbison-Walker Pittsburgh | Thomas Jefferson Hospital – Philadelphia |
| Harbison-Walker Refractories Co. Chester, Delaware County | Thomas Jefferson University Hospital – Philadelphia |
| Harbison-Walker Refractories Co. Mt. Union | Thomas Kent Manufacturing Co. – Clifton Heights |
| Harbison-Walker Refractories Co. Pittsburgh | Thomas May Pierce School – Philadelphia |
| Harbison-Walker Refractories Co. Woodland | Thomas Textile – Philadelphia |
| Harbison-Walker Refractories Mt. Union | Thompson & Sons – Pittsburgh |
| Harbor Steel New Castle | Thompson Brothers – Philadelphia |
| Harbson Walker Co. – Pittsburgh | Thos Dolan & Co. – Philadelphia |
| Harcast Corp. – Glenfield | Thos E Lutner – Philadelphia |
| Harcast Corp. – Glenolden | Thos. Wolstenholme Sons & Co. – Philadelphia |
| Harcum Junior College – Bryn Mawr | Three Mile Island Dauphin County |
| Hardesty Industries – Philadelphia | Three Mile Island Nuclear Plant – Middletown |
| Harding Ave. Jr. High School Aliquippa | Three Mile Island Nuclear Power Plant – Harrisburg |
| Harding Ave. Junior High School | Three Mile Island Nuclear Station Middletown |
| Hardinge Co. – York | Three Mile Island Power Plant – Harrisburg |
| Hardware & Industrial Tool – Philadelphia | Three Mile Island Power Station – Three Mile Island |
| Hardwich & Magee Co. – Philadelphia | Thrift Drug Store – Clairton |
| Hardwick & Magee Co. – Philadelphia | Thrift Drug Warehouse – Blawnox |
| Harison Walker – Mifflin | Thro’ American Gas & Electic Co. – Philadelphia |
| Harleigh Brookwood Coal Co. – Mahanoy Plane | Thro.’ Chas. M’Caul Co. – Philadelphia |
| Harleigh Brookwood Coal Co. Pottsville | Tide Water Pipeline Co. McCauley |
| Harleigh- Brookwood Colleries | Tidewater Pipeline Co. Bradford |
| Harmar Coal – Harmaville | Tidewater Pipeline Co. Hudsondale |
| Harmar Coal Harmarville | Tidewater Steel Co. – Chester |
| Harmar House Motel – Springdale | Tilden Junior High School Philadelphia |
| Harmarville Mine – Harmarville | Till Distributing – Erie |
| Harmarville Sewage Treatment Plant Harmarville | Timothy Thornton Construction – Wexford |
| Harmerville High School – Harmerville | Tin Mill Aliquippa |
| Harmerville Rehab Center – Harmerville | Tin Plate Manufacturing Co. |
| Harmony School District – Harmony | Tioga Coal Co. – Wilkes Barre |
| Harold Junior High School – Hempfield | Tionesta Valley Chemical Co. Mayburg |
| Harrisburg Foundry & Machine Co. – Easton | Tippins Machinery Co. Inc. Pittsburgh |
| Harrisburg Hospital – Harrisburg | Titan Metal Manufacturing Co. Bellefonte |
| Harrisburg International Airport – Middletown | Titan Missile Sites – Ephrata |
| Harrisburg Light & Power Co. – Harrisburg | Titus Generating Station Power Plant – Reading |
| Harrisburg State Hospital Boiler House Harrisburg | Titus Generating Station Reading |
| Harrisburg Station – Philadelphia | Titus Powerhouse Reading |
| Harrisburg Steel – Harrisburg | Titus Station Plant Superintendent Reading |
| Harrisburg Water Works – Harrisburg | Titus Station Powerhouse |
| Harrisburgh Light & Power Co. – Harrisburg | Titus Station Powerhouse – Reading |
| Harrisburgh Water Works – Harrisburg | Titus Station Unit Heater Reading |
| Harrison Brothers – Philadelphia | Titusville Ironworks – Titusville |
| Harrison Building – Philadelphia | Titusville Ironworks Co. |
| Harrison Elementary School – Penn Trafford | Titusville Supply Co. – Titusville |
| Harrison Frazier & Co. – Philadelphia | Tive Water Pipe Line Co. – McCauley |
| Harrison Shop – Rt 8 – Glenshaw | Tobyhanna Signal Depot Building Tobyhanna |
| Harrison, Frazier & Co. – Philadelphia | Todays Home – Greentree |
| Harrison, Frazier Co. Philadelphia | Toffs Inc – Doryea |
| Harrison, Havemeyer & Co. – Philadelphia | tomic Power Div – Bettis Field – Mifflin Township |
| Harrison, Havemeyer & Co. Franklin Refinery – Philadelphia | Tonsina – Chester |
| Harrison, Havemeyer Co. Philadelphia | Toolmatic Co. – Zeleinople |
| Harry A Prock Cabinet Co. – Glenside | Topps Bubble Gum – Avoca |
| Harry C Olson Inc. Mt Lebanon | Topton Bakery Topton |
| Harry Elenberger Lbr Co. – Chicora | Torrance State Hospital – Torrance |
| Harry Roman – Pittsburgh | Tosco Refining Co. – Trainer |
| Harry Williams Construction – Carlisle | Toth Auto – Hartstown |
| Harry’s Auto Repairs Philadelphia | Toth Trucking Honesdale |
| Harsburgers Dairy – Altoona | Towanda Co. |
| HarsCo. Corp. – Camp Hill | Tower Hill Connellsville Coke Co. – Republic |
| Harshaw, Fuller, & Goodwin – Philadelphia | Tower Hill Connellsville Coke Co. Uniontown |
| Hartman Steel Co. – Beaver Falls | Town Houses – Connellsville |
| Harvey & Collins – Austin | Town Of Harmarville – Sewage Treatment Plant – Harmaville |
| Harwood Electric & Power Co. Harwood | Townsend Co. – New Brighton |
| Harwood Electric Co. Harwood Mines | Township Light & Power Co. – Shamokin |
| Harwood Electric Power Co. – Harwood | Township Light, Heat & Power Co. Shamokin |
| Haselton Sewage Hazelton | Township Of Annville – Annville |
| Haskell Manufacturing – Oakmont | Toyad Co. – Latrobe |
| Hatboro Plumbing & Heating – Hatboro | Tr Stat No Tr #103 Aliquippa |
| Hatfield Power Station – Masontown | Traco Window Factory – Cranberry |
| Hatfield Power Station Hatfield | Trade & Convention Center – Philadelphia |
| Hatfield Power Station, Units 1 & 2 Masontown | Traders Coal Co. – Laflin |
| Hatfield’s Ferry Power Plant – Masontown | Tradesman Grain Elevator & Storage Co. Philadelphia |
| Hatfield’s Ferry Power Station – Greensburg | Trafford High School – Trafford |
| Hauto Steam Electric Station – Hauto | Trailmobile Manufacturing Co. – Philadelphia |
| Haverford College – Haverford | Trans- Lux Theatre Colonial Harrisburg |
| Haverford High School – Haverford | Trans Penn Wax Co. – Titusville |
| Haverford State Mental Hospital – Haverford | Transcontinental Gas Pipeline Corp. – Renovo |
| Hawk Run Acid Mine Water Treatment Plant Hawk Run | Transcontinental Pipeline Corp. – Frazer |
| Hawkins Village Housing Project – Rankin | Trans-Lux Theatre Colonial – Harrisburg |
| Hayes Munition Plant – Hayes | Trappe & Limerick Electric Street Railway Co. – Collegeville |
| Haymaker Village – Monroeville | Treadkill Buck Run Coal Co. – Minersville |
| Hays Army Depot – Pittsburgh | Treadwell Construction Co. – Midland |
| Hays Ordinance – Hays | Tred Weld – Nevel Island |
| Hazard Manufacturing Co. – Wilkes Barre | Tredyffrin Township |
| Hazel Atlas Glass Co. – Washington | Tremont Laundry Co. – Philadelphia |
| Hazelton Plumbing Heating Supply Co. Hazelton | Trent Inc. – Philadelphia |
| Hazelton Sewage Plant Hazelton | Trent, Inc. – Philadelphia |
| Hazelton Sewage Treatment Hazelton | Treverton Electric Light & Power Station – Trenton |
| Hazelton Water Co. – Hundsondale | Trexler Farms – Allentown |
| Hazelton Water Works. – Hazleton | Trexler Farms Egypt |
| Hazelwood Byproducts – Pittsburgh | Trexlertown Paper Box Co. – Trexlertown |
| Hazelwood Byproducts #2 Fractionating Column Pittsburgh | Tri Cash & Carry Lumber Co – Beaver Falls |
| Hazelwood Plant Batt #2 Pittsburgh | Tri Cities Water Co. – Charleroi |
| Hazelwood Plt – Pittsburgh | Tri- Ridge Corp. – Clinton |
| Hazelwood Plt Batt #2 – Pittsburgh | Tri River Building Products Inc. – Greensburg |
| Hazelwood Works – Pittsburgh | Tri River Building Products Inc. Greensburg |
| Hazen Engineering Co. – Penn Hills | Tri State Non Ferrous Co. – Quakertown |
| Hazle Mountain Coal Co. – Conyngham | Triangle Mechanical Co. North Wales |
| Hazlet & Spring Hill | Tribune Democrat – Johnstown |
| Hazleton Authority Hazleton | Trinity Middle School – Washington |
| Hazleton Brick Co. – Hazleton | Tri-State Engineering – Washington |
| Hazleton City Of – Hazleton | Tri-State Metals Co. Quakertown |
| Hazleton Electric Light & Power Co. – Hazleton | Tri-State Non Ferrous Co. Quakertown |
| Hazleton Local Office, 75 North Laurel Street Hazelton | Trojan Powder Co. – Seiple |
| Hazleton Water Works – Hazleton | Trooper High School – Trooper |
| Hbg – Enola | Trost Sheet Metal Co. – Erie |
| Hc Price – Connelsville | Troy Jack – Huntingdon |
| Hc Prick, National #1 – Bridgeville | Tru Knit Industries – Philadelphia |
| Heatherington Plant – Folcroft | Truck Station 70 – Pittsburgh |
| Heaven Nursing Home Vandergrift | Truck Station 70 – Welshman B P Plant – Pittsburgh |
| Hebrew Institute – Squirrel Hill | Truck Stop – Corsica |
| Heere Bros. Reading | Truck Stop – Harrisburg |
| Heeren Brothers & Co. – Pittsburgh | Truesdale Colliery – Nanticoke |
| Hefferman Co. – Carnegie | Truesdale Colliery Plymouth |
| Heidelberg Colliery – Avoca | Trw Inc. – Harrisburg |
| Heintz Div Of Kelsey Hayes Co. – Philadelphia | Tub Prod. – Koppel |
| Heintz Division of Kelsey-Hayes Co. Philadelphia | Tubalas Products Div – Beaver Falls |
| Heintz Manufacturing Co. – Philadelphia | Tubalas Products Division – Beaver Falls |
| Heintz Manufacturing Plant – Philadelphia | Tube City Brewing Co. – McKeesport |
| Heinz H J Co. – Pittsburgh | Tuberculosis Hospital – Pittsburgh |
| Heinz U.S.A. – Pittsburgh | Turbine Laboratory School |
| Heinz, H.J. Co. – Pittsburgh | Turner & Serrel – Philadelphia |
| Helen Mining Homer City | Turtle Creek Valley Water Co. – Pittsburgh |
| Helfenstein, Lewis & Green – Philadelphia | Tuscarora Oil Co. Ltd. – Harrisburg |
| Hellen Mills – Brockport | TWR Inc. Harrisburg |
| Hellen Mills Brockport, Elk County | Tyco Electronics Corp. Harrisburg |
| Hellwig Silk Dying Co. – Wissinoming Philadelphia | Tygart Glass – Washington |
| Hemlock Creek | Tygart Valley Glass Co. – Washington |
| Hempfield Elementary School – Greensburg | Tyler Charcoal Iron Tin Mills – Washington |
| Hempfield Grade School – Hempfield | Tyler School Of Fine Art – Philadelphia |
| Hempfield High School – Greensburg | Tyler Tube & Pipe Co. – Washington |
| Hempfield Jr. High School – Greensburg | Tynan Incinerator- Dela City, Chester Township |
| Hempfield Power Station -Greensburg | Tyrol Distributors Allentown |
| Hempfield Township School – Greensburg | Tyrone High School – Tyrone |
| Hendel Hat Co. – Reading | Tyrone Iron Co. – Harrisburg |
| Henderson Sugar Refinery – Philadelphia | Tyrone Iron Co. Tryone |
| Hendrick Manufacturing Co. – Carbondale | Tyrone Paper Mill Westvaco – Tyrone |
| Henry Clay Frick Community Hospital – MT. Pleasant | Tyson Metal Products – Pittsburgh |
| Henry Clay Furnace – Chickies | U G I Corp. Harrisburg |
| Henry Colliery – Wilkes Barre | U G I Corp. Hunlock Creek |
| Henry Disston Sons Tacony | U G I Corp. Lancaster |
| Henry Laudenslager – Harrisburg | U G I Corp. Reading |
| Henry Mckeen & Co. – Lehigh County | U S Dept Of Agriculture – Philadelphia |
| Henry McKeen & Co. Lehigh Mills Easton | U S Steel Corp – Pittsburgh |
| Henry Miller Carpentry Cochranton | U. G.I. Co. – Philadelphia |
| Henry Phipps Central Power Plant – Pittsburgh | U. G. I. Co. Philadelphia |
| Henry Phipps Mutual Training School Allegheny | U. S Post Office – Altoona |
| Heppenstall- Eddystone Corp. Eddystone | U. S Post Office – Bridgeville |
| Heppenstall Forge & Knife Co. – Pittsburgh | U. S Post Office – Greensboro |
| Heppenstall Of Pittsburgh – Pittsburgh | U. S Post Office – Johnstown |
| Heppenstalls – Lawrenceville | U. S Post Office – Philadelphia |
| Heppnstall Forge & Knife Co. – Pittsburgh | U. S Post Office – Pittsburgh |
| Hercules Cement Co. Stockertown | U. S Post Office – Warrendale |
| Hercules Cement Corp. – Hercules | U. S Post Office – Washington (Old Building) |
| Hercules Chemical Co. Elizabeth | U. S Post Office 30Th Street Station Philadelphia |
| Hercules Picco Resins – W. Elizabeth | U. S. Air Force – Olmsted Field – Middletown |
| Hercules Powder Co. – Philadelphia | U. S. Aluminum Co. – New Kensington |
| Hercules Powder Co. Higgins Plant Philadelphia | U. S. Aluminum Co. New Kensington |
| Herman Goldner Co. – Philadelphia | U. S. Aluminum Corp. – Marietta |
| Herr Gas Oil Shamokin | U. S. Aluminum Corp. Marietta |
| Herris Island – Pittsburgh | U. S. Aluminum of America – Pittsburgh |
| Herron Hill Pumping Station – Pittsburgh | U. S. Aluminum of America Pittsburgh |
| Herrs Island Washingtons Landing | U. S. Army – Philadelphia |
| Herrs Potato Chips, Inc. – Nottingham | U. S. Army Reserve Center – Pittsburgh |
| Hershey Chocolate Co. – Bernville | U. S. Army Reserve Center – Reading |
| Hershey Chocolate Corp. – Hershey | U. S. Army Supply Base – Philadelphia |
| Hershey Medical Center – Hershey | U. S. Army War College- Carlisle Barracks – Carlisle |
| Hershey Motel – Hershey | U. S. Asbestos Co. – Manheim |
| Hershey State Police Training Barri – Hershey | U. S. Asbestos Co. Manheim |
| Hertz Supply Co. Inc. Allentown | U. S. Asbestos Raybestos-Manhattan Inc. Manheim |
| Hess Brothers Warehouse – Allentown | U. S. Bureau of Mines – Braceton |
| Hess Department Store – Lancaster | U. S. Bureau of Mines – Pittsburgh |
| Hess Department Store, Harrisburg – Lancaster | U. S. Bureau of Mines – Schuylkill Haven |
| Hess, Inc. – Scranton | U. S. Bureau of Mines Allegheny City Braceton |
| Heston High School – Philadelphia | U. S. Bureau of Mines Bruceton |
| Hestonville Mantua Fairmount Passenger RR Philadelphia | U. S. Bureau of Mines Pittsburgh |
| Hetrick & Wilson – Indiana | U. S. Bureau of Mines Schuykill Haven |
| Hewlett Packard Avendale | U. S. Bureau of Mines Snowden Township. Bruceton |
| Heyl & Patterson Inc – Pittsburgh | U. S. Bureau of Mines Swedeland |
| Heyl Patterson, Inc. Pittsburgh | U. S. Chemical, Neville Island |
| Heyl Physicians Supply Co. – Erie | U. S. Coal & Coke Co. – Pittsburgh |
| Hh Robertson – Ambridge | U. S. Coal & Coke Co. Pittsburgh |
| Hi Line Steel Boiler Mt Carmel | U. S. Courthouse & Office Building – Philadelphia |
| Hibbard-Rodman-Ely Safe Co. – Plainfield | U. S. Courthouse Office Building Philadelphia |
| Hickory Ridge Colliery – Shamokin | U. S. Courthouse Philadelphia |
| Hickory Swamp Colliery – Shamokin | U. S. Department of Commerce, Bureau of Mines, Pittsburgh |
| Highland Brewing Co. – Pennsylvania | U. S. Dept Of Agriculture – Philadelphia |
| Highland Brewing Co. – Pittsburgh | U. S. Dept of Agriculture Philadelphia |
| Highland Colliery #5 – Jeddo | U. S. Dept of Agriculture Wyndmoor |
| Highland Mall – Natrona Hts | U. S. Dept. of Commerce |
| Highlands High School – Natrona Heights | U. S. Dept. Of Commerce, Experimental Station – Pittsburgh |
| Highway Appliance Company Chaneroi | U. S. Electric Illuminating Co. |
| Highway Barnes – Indiana | U. S. Electric Illuminating Co. – Philadelphia |
| Highway Materials Bridgeport | U. S. Engineers Susquehanna River Flood Control – Eiles Barre |
| Hill Hall, Wernersville State Hospital Wernersville | U. S. Engineers Susquehanna River, Barre |
| Hills Department Store – Mifflin | U. S. Envelope – Williamsburg |
| Hills Housing Complex – Hills | U. S. Glass Plant – Glassport |
| Hillside Coal & Iron Co. – Mayfield | U. S. Government – Special Ordinance Plant – York |
| Hillside Coal & Iron Co. Pittston | U. S. Government Shell Loading Plant #1 Tullytown |
| Hilton Hotel – Lancaster | U. S. Government Special Ordinance Plant York |
| Hilton Hotel Empire Building Rocks | U. S. Government Supply Depot – Philadelphia |
| Hilton Hotel Lancaster | U. S. Government Supply Depot Quartermasters Philadelphia |
| Hilton Hotel Mckees Rocks | U. S. Gypsum Co. Darmont |
| HInchliffe Keener Inc. Pittsburgh | U. S. Gypsum Co. Oakmont |
| HInchliffe Keener Indiana City | U. S. Gypsum Co. Philadelphia |
| Hinckliffe Keener – Pittsburgh | U. S. Hoffman Machinery – Scranton |
| Hinkle & McCoy – Philadelphia | U. S. Hoffman Machinery Corp. – Pittsburgh |
| Hiram G. Andrews Rehabilitation Center – Johnstown | U. S. Hoffman Machinery Corp. Pittsburgh |
| Hiram Swank & Sons – Johnstown | U. S. Hoffman Machinery Scranton |
| Hiram Swanks Son – Johnstown | U. S. Iron & Tin Plate Manufacturing Co. – Dremmler |
| Hiram Swanks Sons Irovone | U. S. Merchant Marine Academy – Kingsport |
| Hiram Swanks Sons Johnstown | U. S. Mint – Philadelphia |
| Hitchew Planning Mill – Winber | U. S. Mint 4Th Arch Street Philadelphia |
| Hj Heinz Pittsburgh | U. S. Mint Philadelphia |
| HK Porter Co. – Pittsburgh | U. S. Naval Air Division – Johnsville |
| Hodge Foundry – Grove City | U. S. Naval Damage Control Training Center – Philadelphia |
| Hoetetters Supply Co. York | U. S. Naval Hospital – Philadelphia |
| Hoffman Bros – Punxsutawney | U. S. Naval Reserve Aviation Base – Horsham |
| Hog Island Shipyard – Philadelphia | U. S. Naval Shipyard – Philadelphia |
| Holiday Inn – Brookville | U. S. Navy – Philadelphia |
| Holiday Inn – Clarion | U. S. Navy Mine Depot – York Lyn |
| Holiday Inn – Express – Pittsburgh | U. S. Navy Yard – League Island |
| Holiday Inn – Indiana | U. S. Navy Yard – Philadelphia |
| Holiday Inn – Johnstown | U. S. Pipe & Foundry Co. – Scottsdale |
| Holiday Inn – Ligonier | U. S. Pipe & Foundry Co. Scottdale |
| Holiday Inn – Mifflin | U. S. Pipe & Foundry Scottdale |
| Holiday Inn – New Castle | U. S. Plywood – Champion |
| Holiday Inn – Philadelphia | U. S. Post Office – Philadelphia |
| Holiday Inn – Uniontown | U. S. Post Office 30Th Street Station Philadelphia |
| Holland Furnace – Delaware City | U. S. Post Office Altoona |
| Hollenbach Colliery #2 & #5 – Wilkes Barre | U. S. Post Office Bridgeville |
| Hollidaysburg Power Station – Hollidaysburg | U. S. Post Office Greensboro |
| Holmesburg, Tacony & Frankford Electric Railway Co. Tacony | U. S. Post Office Johnstown |
| Holtwood Power Station – Holtwood | U. S. Post Office Philadelphia |
| Holy Family Church – Seward | U. S. Post Office Pittsburgh |
| Holy Ghost Convent & School Pittsburgh | U. S. Post Office Warrendale |
| Holy Redeemer Hospital – Meadowbrook | U. S. Post Office Washington – Old Building |
| Holy Redeemer Hospital Philadelphia | U. S. Powder Co. Explosive Division Mt. Braddock |
| Holy Rosary Church & Parrish – Scranton | U. S. Powder Co. Explosives Division – Mt. Braddock |
| Holy Trinity Church – Moon Township | U. S. Roll Mill – Avonmore |
| Holy Trinity Church – Whitehall | U. S. Sanitary Manufacturing Co. – Monaca |
| Home Electric Light & Steam Heating Co. – Tyrone | U. S. Sanitary Manufacturing Co. Monaca |
| Home for Indigent & House of Correction | U. S. Sanitary Mfg. Monaca |
| Home The Blind – Swissville | U. S. Seamless Tube Co. – Christy Park |
| Homeopathic Hospital – Pittsburgh | U. S. Seamless Tube Co. Christy Park |
| Homeopathic Hospital for The Insane – Allentown | U. S. Signal Corps – Administration Building |
| Homeopathic Hospital Pittsburgh | U. S. Signal Corps – Administration Building – Tobyhanna |
| Homeopathic State Hospital – Lehigh County | U. S. SteeI Irvin Works Mifflin |
| Homeopathic State Hospital for The Insane – Hanover | U. S. Steel – Clairton Works – Clarion |
| Homeopathic State Hospital Lehigh County | U. S. Steel – Donora |
| Homer City Generating Station – Homer | U. S. Steel – Irving Plant – Dravesburg |
| Homer City Generating Station, Unit #3 Homer City | U. S. Steel American Bridge – Ambridge |
| Homer City Power Generating Station – Homer City | U. S. Steel Applied Research Center Monroeville |
| Homer City Power Station – Indiana | U. S. Steel Batteries #10, 11 12 Clairton |
| Homer City Power Station Homer City | U. S. Steel Carey Furnace – Rankin |
| Homer City Power Station Indiana County | U. S. Steel Carnegie Illinois Steel – Farrell |
| Homer City Powerhouse Homer City | U. S. Steel Carrie Furnace Sinter Plant Rankin |
| Homer City- Sam Place – Coral | U. S. Steel Carrie Furnace |
| Homer City Station – Coral | U. S. Steel Carrie Furnaces Rankin |
| Homer City Station Power Plant Homer City | U. S. Steel Central Boiler House McKeesport |
| Homestead – Erie | U. S. Steel Chemical Plant – Pittsburgh |
| Homestead Borough Of Water Works – Homer City | U. S. Steel Chemical Plant Neville Island Pittsburgh |
| Homestead Highland Street Railway Co. – Homer City | U. S. Steel Christy Park Works – McKeesport |
| Homestead Industries – Coraopolis | U. S. Steel Christy Park Works- McKeesport |
| Homestead Presbyterian Church – Homestead | U. S. Steel Clairton Coke Coal Chemical Works Clairton |
| Homestead Steel Works – Munhall | U. S. Steel Clairton Job McKees Rocks |
| Homestead Steel Works Homestead | U. S. Steel Clairton Works Benzene Boiler House Clairton |
| Homestead Steel Works Munhall | U. S. Steel Clairton Works Clairton |
| Homestead Steel Works Pittsburgh | U. S. Steel Clairton Works Hot Pitch Tank Clairton |
| Homestead Steel Works Rankin | U. S. Steel Clairton Works Powerhouse #2 Clairton |
| Homestead Works – Rankin | U. S. Steel Co. – Irwin |
| Homestead Works U. S. Steel – Erie | U. S. Steel Coke Oven Division Clairton |
| Honey Brook Colliery #5 – Aurenreid | U. S. Steel Company Pittsburg |
| Honeywell – Forrest Hills | U. S. Steel Corp. – Allenport |
| Honeywell Fort Washington | U. S. Steel Corp. – Berwyn |
| Honeywell, Inc. – Emlenton | U. S. Steel Corp. – Braddock |
| Honeywell, Inc. T Smethport | U. S. Steel Corp. – Christy Park Works – McKeesport |
| Hood, Bonbright & Co. – Philadelphia | U. S. Steel Corp. – Duquesne |
| Hoopes & Townsend Co. Ft. Washington | U. S. Steel Corp. – Johnstown |
| Hoopes & Townsend Ft. Washington | U. S. Steel Corp. – Pittsburgh |
| Hope Natural Gas Co. – Pittsburgh | U. S. Steel Corp. – Saxonburg Sintering Plant – Houserville |
| Hopeman Brothers – Chester | U. S. Steel Corp. – Vandergrift Works – Vandergrift |
| Hopewell Shopping Center – Hopewell | U. S. Steel Corp. Ambridge Plant Ambridge |
| Hopkinson House Apartments – Philadelphia | U. S. Steel Corp. Ambridge |
| Hopper Paper Co. – Reading | U. S. Steel Corp. American Bridge – Ambridge |
| Horlacher Brewing Co. – Allentown | U. S. Steel Corp. Applied Research Lab Station Universal |
| Horlacher Brewing Co. – Pennsylvania | U. S. Steel Corp. Applied Research Laboratory Monroeville |
| Horner School Building – Wilkinsburg | U. S. Steel Corp. Benzine Plant Clairton |
| Hornes Dept. Store – Greengate Mall – Greensburg | U. S. Steel Corp. Berwyn |
| Hornes Dept. Store – Monroeville | U. S. Steel Corp. Braddock |
| Hornes Dept. Store – North Hills – Pittsburgh | U. S. Steel Corp. Christy Park Works – McKeesport |
| Hornes Dept. Store Greengate Mall – Greensburg | U. S. Steel Corp. Clairton Coke Coal Chemical Works Clairton |
| Hornes Dept. Store North Hills – Pittsburgh | U. S. Steel Corp. Clairton Works B H Nbr 2 Clairton |
| Hornes Warehouse – Crafton | U. S. Steel Corp. Clairton Works Bengail Plant Gate Clairton |
| Horsehead Industries – Monaca | U. S. Steel Corp. Clairton Works Benzene Boiler House Clairton |
| Hosletter Supply Co. York | U. S. Steel Corp. Clairton Works Hot Pitch Tank Clairton |
| Hospital Butler | U. S. Steel Corp. Clairton Works Powerhouse #2 Clairton |
| Hospital For the Insane – Retreat | U. S. Steel Corp. Clairton Works Tar Distillation Plant Clairton |
| Hospitality Motor Inn Pittsburgh | U. S. Steel Corp. Donora |
| Host Farms – Lancaster | U. S. Steel Corp. Dravosburg |
| Host Motel – Lancaster | U. S. Steel Corp. Duquesne Works Station No 13 Duquesne |
| Hostetter Supply Co. York | U. S. Steel Corp. Duquesne |
| Hotel Lafayette – Philadelphia | U. S. Steel Corp. Edgar Thompson Works Pittsburgh |
| Houdry Processing Corp. Linwood | U. S. Steel Corp.- Edgar Thomson Works – Braddock |
| House Of Correction – Philadelphia | U. S. Steel Corp. Ellwood City |
| House Of Good Shepherd – Reading | U. S. Steel Corp. Fairless Hills |
| House Of the Good Shepherd – Philadelphia | U. S. Steel Corp. Fairless Works Fairless |
| Housing Authority of Johnstown – Johnstown | U. S. Steel Corp. Fairless Works Morrisville |
| Housing Authority of Pittsburgh | U. S. Steel Corp. Green City |
| Housing Project – Braddock | U. S. Steel Corp. Hillsville |
| Housing Project – Clairton | U. S. Steel Corp. Homestead District Works Pittsburgh |
| Housing Project – Coaldale | U. S. Steel Corp. Homestead Works Homestead |
| Housing Project – Donora | U. S. Steel Corp. Homestead Works Pittsburgh |
| Housing Project – Fayette County | U. S. Steel Corp. Irvin Works Dravosburg |
| Housing Project – Johnstown | U. S. Steel Corp. Irvin Works Irvin |
| Housing Project – Masontown | U. S. Steel Corp. Irvin Works Mifflin |
| Housing Project – McKeesport | U. S. Steel Corp. Irvin |
| Housing Project – Monesson | U. S. Steel Corp. Jack Smith Fairless Works Morrisville |
| Housing Project – New Castle | U. S. Steel Corp. Johnstown |
| Housing Project – Pottsville | U. S. Steel Corp. Lab Station Number 2 Universal |
| Housing Project – Shamokin | U. S. Steel Corp. McDonald |
| Houze Glass Co. – Pt. Marion | U. S. Steel Corp. McKees Rocks |
| Howard Axle Plant – Homer City | U. S. Steel Corp. McKeesport |
| Howard Johnson – New Stanton | U. S. Steel Corp. Metallurgical Lab Vandergrift |
| Howard Johnson Motel Brookeville | U. S. Steel Corp. Monaca |
| Howard Johnson Motel Irwin | U. S. Steel Corp. Monessen |
| Howard Johnson Motel Washington | U. S. Steel Corp. Monroeville |
| Howard Reed – Philadelphia | U. S. Steel Corp. Morrisville |
| Howe & Polk – Danville | U. S. Steel Corp. National Tube |
| Howe & Samuel – Danville | U. S. Steel Corp. National Works McKeesport |
| Howe Brown & Co. – Pittsburgh | U. S. Steel Corp. Neville Island |
| Howe Sound Co. – Lancaster | U. S. Steel Corp. New Eagle |
| Howe, Brown & Co. – Pittsburgh | U. S. Steel Corp. Pittsburgh |
| Howmet Corp. – Lancaster | U. S. Steel Corp. Rankin Works #2 Turbo Blower Rankin |
| Howmet Corp. Lancaster | U. S. Steel Corp. Rankin |
| Hubbard Tool Div – Pittsburgh | U. S. Steel Corp. Saxonburg Sintering Plant Houseville |
| Hubbard Tool Division – Pittsburgh | U. S. Steel Corp. Saxonburg |
| Hubbs & Howe Co. – Erie | U. S. Steel Corp. Shiremanstown |
| Hubbs Howe Co. Erie | U. S. Steel Corp. Tar Distillation Plant Clairton |
| Hudec Colliery, Inc. Johnstown | U. S. Steel Corp. Urban Works McKees Rocks |
| Hudson Coal Co. – Carbondale | U. S. Steel Corp. Vandergrift Works |
| Hudson Coal Co. Olyphant | U. S. Steel Corp. Vandergrift Works Vandergrift |
| Hudson Coal Co. Scranton | U. S. Steel Corp. Vandergrift |
| Hudwood Irwin Co. Inc. – Huntingdon | U. S. Steel Corp. Works Auditor Clairton Works Clairton |
| Huff Power Station – Johnstown | U. S. Steel Corp. Works Station No 13 Duquesne |
| Huff Power Station – New Florence | U. S. Steel Corp. Wyeth Labs Chester |
| Huffman Industries – Sinking Springs | U. S. Steel Duquesne Works – Duquesne |
| Hugh Mcinnes Rebecca Paper Mill – Bridgeport | U. S. Steel Edgar Thompson Works Pittsburgh |
| Hughes & Gauthorp Co. – Pittsburgh | U. S. Steel Edgar Thomson Works – Braddock |
| Hughes & Patterson – Philadelphia | U. S. Steel Edgar Thomson Works Braddock |
| Hugus & Hacke – Pittsburgh | U. S. Steel Fairless Works – Fairless Hills |
| Hummelstown Water Supply – Harrisburg | U. S. Steel Furnace – Rankin |
| Hunlock Creek Luzerne County | U. S. Steel Headquarter Research Center Monroeville |
| Hunlock Creek Power Station – Hunlock Creek | U. S. Steel Headquarters Building – Pittsburgh |
| Hunlock Creek Powerhouse – Hunlock Creek | U. S. Steel Imperial W Oil City |
| Hunter Manufacturing – Levittown | U. S. Steel Irvin Works – Mifflin |
| Hunter Sales Industrial – Bethel Park | U. S. Steel Irvin Works Dravosburg |
| Hunter Saw & Machine – Lawrenceville | U. S. Steel Irvin Works Irvin |
| Hunter Saw Machine Lawrenceville | U. S. Steel Isabella Furnace – Etna |
| Hunting Park Avenue Plant – Philadelphia | U. S. Steel Jack Smith Fairless Works Morrisville |
| Hunting Park Plant – Philadelphia | U. S. Steel Job Philadelphia |
| Huntingdon Bank – Huntingdon | U. S. Steel Maple Creek Coal Mine – New Eagle |
| Huntington High School – Huntington | U. S. Steel Metallurgical Lab Vandergrift |
| Hupp Ps – New Florence | U. S. Steel Mill – Ambridge |
| Hussey Building – Pittsburgh | U. S. Steel Mill – Duquesne Works – Duquesne |
| Hussey Copper Ltd. – Leetsdale | U. S. Steel Mill – Edgar Thompson Plant – Braddock |
| Hussey Copper Plant – Leetsdale | U. S. Steel Mill – Fairless Works – Fairless Hills |
| Hussey Metals Co. Leetsdale | U. S. Steel Mill – Morton |
| Hutchinson Street Station – Philadelphia | U. S. Steel Mill Armco Steel-Ambridge Works Plant – Bristol |
| HV Charles Co. – Philadelphia | U. S. Steel Mill McKees Rocks |
| Hyde Heating Co. Pittsburgh | U. S. Steel Mill, Fairless Hills Morrisville |
| Hyde Park Foundry & Machine – Hyde Park | U. S. Steel National Tube – McKeesport |
| Hyde Park Gas Co. – Scranton | U. S. Steel National Tube Works McKeesport |
| Hyde Park School – Leechburg | U. S. Steel National Works McKeesport |
| Hydril Co. – Rochester | U. S. Steel Neville Island Pittsburgh |
| Hydro-Blast Corp. – Waynesboro | U. S. Steel Office Building Pittsburgh |
| Hydro-Blast Corp. Burnham | U. S. Steel Ordnance Department Neville Island |
| Hydro-Blast Corp. Danville | U. S. Steel Pat. #10, 11, 12 Clairton |
| Hydro-Blast Corp. Erie | U. S. Steel Philadelphia |
| Hydro-Blast Corp. Franklin | U. S. Steel Rankin Works #2 Turbo Blower Rankin |
| Hydro-Blast Corp. Philadelphia | U. S. Steel Research & Development – Monroeville |
| Hydro-Blast Corp. Waynesboro | U. S. Steel Research Center Monroeville |
| Hygeia Ice Co. – Philadelphia | U. S. Steel Sinter Plant #1 Saxonburg |
| Hygrade Food Products – Philadelphia | U. S. Steel Tube McKeesport |
| Hyman Brodsky & Son – Philadelphia i | U. S. Steel Tubular Products Plant – McKeesport |
| I. T .T. Fluid Products – Lancaster | U. S. Steel Urban Works McKees Rocks |
| I. T. E. Circuit Breaker Co. Colmar | U. S. Steel Wheel & Axle – McKees Rocks |
| I. T. E. Circuit Breaker Co. Philadelphia | U. S. Steel Wheel Axle – McKees Rocks |
| Iberia Sugar Cooperative, Inc. – New Iberia | U. S. Steel Works Auditor Clairton Works Clairton |
| Ibm Office Building – Pittsburgh | U. S. Steel, Clairton Works, Benzene Boiler House Clairton |
| Illinois Steel Co. – Pittsburgh | U. S. Steel, Clairton Works, Powerhouse #2 Clairton |
| Illinois Zinc Co. – Pittsburgh | U. S. Steel, Sinter Plant#1 – Saxonburg |
| Imagining Systems – Latrobe | U. S. Steel, Usx – Pittsburgh |
| Immaculate Conception Cathedral – Philadelphia | U. S. Steel-Usx Christy Park McKeesport |
| Immaculate Conception School – Lock Haven | U. S. Steel-Usx Munhall |
| Imperial Leather Co. Allegheny | U. S. Uniroyal – Butler |
| Imperial Type Metals – Philadelphia | U. S. Veterans Administration – Altoona |
| Impervious Varnish Co. – Rochester | U. S. Veterans Hospital – Coatesville |
| Independence Hall 6Th Chestnut Streets Philadelphia | U.S. Naval Damage Control Training Center |
| Independent Brewing Co. of Pittsburgh – Pittsburgh | U.S. Steel Mill |
| Independent Bridge Co. – Pittsburgh | U.S.S. Alderbaran – Chester |
| Independent Equipment Oakdale | U.S.S. Hank – Chester |
| Independent Manufacturing Co. – Philadelphia | U.S.S. Hank Dd-702 – Chester |
| Independent Metal Products – Uniontown | U.S.S. Vermilion – Chester |
| Indiana Cold Storage & Ice Co. – Indiana | Ugi Building – Philadelphia |
| Indiana County Railways Co. – Homer | UGI Building Philadelphia |
| Indiana County Railways Co. Punxsutawney | UGIi Corp. – Lancaster |
| Indiana Elementary School – Indiana | Ukranian Cathedral – Chester |
| Indiana Erie Co. – Indiana | Underground McKees Rocks |
| Indiana Hospital – Indiana | Underground Pentagon Chambersburg |
| Indiana Jr. High School – Indiana | Underwood Coal Co. Scranton |
| Indiana Provision Co. – Indiana | Union Boiler Philadelphia |
| Indiana State Teachers College – Indiana | Union Carbide – Castle Shannon |
| Indiana University of Pennsylvania – Dormitories | Union Carbide – La Porte |
| Indiana University of Pennsylvania – Garage Maintenance Building | Union Carbide – St. Marys |
| Industrial Air Conditioning – Philadelphia | Union Carbide Carbon Corp. Coatesville |
| Industrial Cold Storage & Warehouse Co. – Philadelphia | Union Carbide Carbon Corp. Duquesne |
| Industrial Div. Warehouse – Pittsburgh | Union Carbide Carbon Corp. Kittanning |
| Industrial Equipment Co. – Scranton | Union Carbide Carbon Corp. Pittsburgh |
| Industrial Gasket & Shim Co. – Meadow Lands | Union Carbide Caribe Corp. Guayanilla |
| Industrial Insulation Sales Inc. – Erie | Union Carbide Corp. – Harrisburg |
| Industrial Steel Corp. Carnegie | Union Coal Co. – Mt. Carmel |
| Industrial Valley Bank – Philadelphia | Union Coal Co. Scott Colliery Mt Carmel |
| Ingalls Iron & Steel – Verona | Union Coal Co. Shamokin |
| Ingersoll Band Co. Athens | Union Dish Co. – Bradford |
| Ingersoll Rand Co. Easton | Union Drawn Steel Co. – Beaver Falls |
| Ingersoll Sergeant Drill Co. – Easton | Union Electric – Burgettstown |
| Ingersoll-Rand – Charleroi | Union Electric Burgettstown |
| Ingersoll-Rand Co. Athens | Union Electric Carnegie |
| Ingersoll-Rand Co. Easton | Union Electric Co. – Pittsburgh |
| Ingersoll-Rand Co. Pittsburgh | Union Electric Steel – Burgettstown |
| Ingo Portugalete | Union Electric Steel Co. – Carnegie |
| Ingomar Community Methodist Church – Ingomar | Union Ice Co. – Pittsburgh |
| Ingram Richardson Co. – Beaver Falls | Union Ironworks – Erie |
| Inland Container Corp. Philadelphia Pahia | Union League Club – Philadelphia |
| Inland Products – Pittsburgh | Union Metal Manufacturing – Stroudsburg |
| Inland Products Herrs Island | Union Mills Paper Manufacturing Co. – New Hope |
| Inland Products Pittsburg | Union Mining Corp. – Latrobe |
| Inland Products, Inc. – Pittsburgh | Union News Cafeteria – Pennsylvania Station |
| Inmetco – Ellwood City | Union Oil Co. Washington |
| Inn Of American – New Stanton | Union Paving Co. Bridgeport |
| Inn of American | Union Paving Co. Philadelphia |
| Inner Forest Darlington | Union Paving Co. Springhouse |
| Inolex Chemical Co. St Philadelphia | Union Railroad – Braddock |
| Inquirer Building Press Room – Philadelphia | Union Railroad – Duquesne |
| Insolite Refractories Co. Pittsburgh | Union Railroad Braddock |
| Instruction of the Blind | Union Railroad Roundhouse Monroeville |
| Insul – Wampum | Union Refining Co – Warren |
| Insulation Sales Co. – Erie | Union Specialties – Verona |
| Insulation Sales Co. Neville Island | Union Specialty Steel – Verona |
| Insulation Sales Co. Pittsburgh | Union Spring Manufacturing Co. – New Kensington |
| Insuldeck Corp. – Bath | Union Spring Manufacturing Co. Pittsburgh |
| Interlake Iron Co. – Erie | Union Station – Pittsburgh |
| Internal Revenue Service Building – Philadelphia | Union Steel Casting – Pittsburgh |
| International Boiler Works Co. Stroudsburg | Union Steel Co. – Donora |
| International Boiler Works Stroudsburg | Union Steel Co. Pittsburgh |
| International Metals Co. Inmetco. – Ellwood City | Union Steel Pittsburgh |
| International Mill Co. Pittsburgh | Union Supply Co. Pittsburgh |
| International Mill Co. Tarentum | Union Switch & Signal – McKeesport |
| International Motor Co. Allentown | Union Switch & Signal Co. – Swissvale |
| International Motor Co. Penn Junction | Union Switch Signal – McKeesport |
| International Paper Co. Aldan Borough | Union Switch Signal – Swissville |
| International Paper Co. Alden | Union Traction Co. – Philadelphia |
| International Paper Co. Container Division Waltz Mills | Union Trust Building Pittsburgh |
| International Paper Co. Erie | Uniontown Demolition – Point Marion |
| International Paper Co. Lock Haven | Uniontown Drive- In – Uniontown |
| International Paper Co. Tonawanda | Uniontown Hospital – Union City |
| International Paper Co. York Haven | Uniontown Housing Project – Uniontown |
| International Service Ind. – Scranton | Uniontown Nursing Home – Uniontown |
| International Shoe Co. – Philadelphia | Uniontown Senior High School – Union City |
| Interstate 80 – Titusville | Uniontown Senior High School Uniontown |
| Interstate Contracting & Coating Co. Zelienople | Uniontown Voctech – Uniontown |
| Interstate Railways Co. – Philadelphia | Uniroyal Rubber Co. – Philadelphia |
| Ionics Corp. Bridgeville | Uniroyal Rubber Co. Philadelphia |
| Iowa Barbed Wire Co. – Allentown | Unit Rail Anchor Corp. – Pittsburgh |
| Ira B. Smay – Bradford | United Artists Theatre Schuykill Mall – Frackville |
| Iron City Heating Co. – Pittsburgh | United Atkinson Inc – Erie |
| Iron City Imp. Co. – Pittsburgh | United Church of Christ – Bethlehem |
| Iron City Industrial Cleaning Corp. Pittsburgh | United Container Corp – Philadelphia |
| Ironworkers Union – Philadelphia | United Container Corp. – Philadelphia |
| Iroquois Apartments – Pittsburgh | United Electric Co. – Lemoyne |
| Irs Building – Philadelphia | United Electric Co. Of America – Philadelphia |
| Irvin Works Mifflin | United Engine & Foundry Co. – Pittsburgh |
| Irving Works Steel Mill Pittsburgh | United Engineering – New Castle |
| Irwin Schools – Irwin | United Engineering & Foundry Co. Pittsburgh |
| Irwin Works – Dravosburg | United Engineering Foundry Co. Homestead |
| Irwin Works – Irwin | United Engineering Foundry Co. New Castle |
| Isabella Furnace Co. – Etna | United Engineering Foundry Co. Pittsburgh |
| Isalys – Blvd of The Allied- Oakland | United Engineering Foundry Co. Titusville |
| Isbrill & Co. – Philadelphia | United Engineering Foundry Co. Vandergrift |
| Isimbel Brothers Stable – Philadelphia | United Engineering Pittsburgh |
| Island Generating Station Storeroom Pittsburgh | United Engineers & Constructors, Inc. Philadelphia |
| Island Petroleum Co, Neville Island – Pittsburgh | United Engr Foundry Co. Pittsburgh |
| Island Petroleum Co. – Nequehoning | United Engr Foundry Co. Vandergrift |
| Island per Co. Carthage | United Fraction Co. – Pittsburgh |
| Island per Mill | United Gas Improvement – Allentown |
| Island Park Powerhouse | United Gas Improvement Co. Gas Plant Steelton |
| Ite Circuit Breaker Co. – Philadelphia | United Gas Improvement Co. Gas Works Philadelphia |
| ITT Fluid Products – Lancaster | United Gas Improvement Co. Germantown |
| ITT Fluid Products Corp. | United Gas Improvement Co. Philadelphia |
| Ivb Building – Philadelphia | United Gas Improvement Co. Wayne |
| Ivor J Lee Co. – Sharon | United Gilsonite Lab. – Scranton |
| Ivy Rock Farm – Connellsville | United Gilsonite Laboratory Scranton |
| Ivy Rock Farm – Conshohocken | United High School – Armagh |
| J & C Nicholson Trustee – Ellwood City | United Industrial Supply Co. – Erie |
| J & L Co. Neville Island | United Metals Fabricating – Johnstown |
| J & L Southside – Southfork | United Parcel – Bethel Park |
| J & L Specialty Steel – Pittsburgh | United Refining Co. – Warren |
| J & L Steel – Ambridge | United Roofing & Manufacturing Co. – Maple Glen |
| J & L Steel – Hazelwood | United States Steel Headquarters Building |
| J & L Steel – Labelle | United Steel & Wire – Wilkes Barre |
| J & L Steel – Pittsburgh | United Steel Barrell – Philadelphia |
| J & L Steel Golf Tower Gulf Oil Refinery – Pittsburgh | United Steel Corp. Duquesne Works Duquesne |
| J & R Meily – Lebanon | United Telephone Co. – Bedford |
| J & W Yewdall – Philadelphia | United Traction Co. – Pittsburgh |
| J North F. Wilcox – Pittsburgh | Univ Atlas Cem Div Of Uss Corp. – Universal |
| J. A. Dougherty’s Sons – Philadelphia | Univ. Welding – Export |
| J. A. Kohlhepp Sons Du Bois | Universal Atlas Cement – North Hampton |
| J. B Eurell Co. Lansdowne | Universal Atlas Cement Pittsburgh |
| J. B Kelly Construction – Philadelphia | Universal Atlas Cement Plant – Universal |
| J. B Van Sciver – Abington | Universal Atlas Cement Universal |
| J. B. Ellison & Sons – Philadelphia | Universal Atlas North Hampton |
| J. B. Lippincott Building – Philadelphia | Universal Atlas U. S. Steel Corp. Universal |
| J. B. LippIncott Building Philadelphia | Universal Cement Plant – Penn Hillsplum Boro |
| J. B. Swayne & Son – Kettett Square | Universal Cyclops – Bridgeville |
| J. B. Veatch Truck Station 103 Aliquippa | Universal Cyclops Corp. Bridgeville |
| J. Bishop & Co. – Malvern | Universal Cyclops Corp. Pittsburgh |
| J. C. Graham & Co. – Philadelphia | Universal Cyclops Corp. Titusville |
| J. C. Greenwood Association, Inc. – Belle Vernon | Universal Cyclops Office Building – Mt. Lebanon |
| J. C. Grover & Sons – Philadelphia | Universal Cyclops Steel Co. – Titusville |
| J. C. Klauder Estate – Philadelphia | Universal Cyclops Steel Corp. – Pittsburgh Works Pittsburgh |
| J. C. McDowell – Pittsburgh | Universal Cyclops Steel Corp. – Works Pittsburgh |
| J. C. Penney Store | Universal Cyclops Steel Mill Titusville |
| J. D Fenny Co. – Harrisburg | Universal Dye Works – Philadelphia |
| J. D Grover & Sons – Philadelphia | Universal Dye Works Tacony |
| J. D. Ferry Co. – Harrisburg | Universal Elec. & Manufacturing. Co. – Johnstown |
| J. D. Grover & Sons – Philadelphia | Universal Insulation Co. – Philadelphia |
| J. D. Morrissey Inc. – Philadelphia | Universal Oil Products- Kendall Refining Co. – Bradford |
| J. E Potter & Co. – Philadelphia | Universal Rubber Co. Products Co. Zelienople |
| J. E. Baker Co. – Billmayer | Universal Rundle Co. Machine Plant New Castle |
| J. E. Baker Co. York | Universal Rundle Co. Mahoningtown |
| J. E. Patterson – Wilkes Barre | Universal Rundle Co. New Castle |
| J. E. Patterson & Co. – Pittston | Universal Rundle Co. VC Plant Mahoningtown |
| J. E. Potter & Co. – Philadelphia | Universal Werehouse – Philadelphia |
| J. F. Betz & Sons – Philadelphia | University Atlas Cement Pittsburgh |
| J. F. Buchanan & Co. – Philadelphia | University City High School – Philadelphia |
| J. Fred Talbott – Philadelphia | University Club – Philadelphia |
| J. G. Brill & Co. – Philadelphia | University Of Pennsylvania – Indiana |
| J. G. Brill Co. – Grays Ferry | University of Pennsylvania Admin Building Philadelphia |
| J. G. Brill Co. Philadelphia | University of Pennsylvania Dental School Philadelphia |
| J. G. White & Co. Palo Alto | University of Pennsylvania Gymnasium Philadelphia |
| J. H Michener & Co. – Philadelphia | University Of Pennsylvania Hospital – Philadelphia |
| J. H. & C.K. Eagle Co. – Shamokin | University of Pennsylvania Hyperbaric Facilities Philadelphia |
| J. H. Michener & Co. – Philadelphia | University of Pennsylvania Hyperbarric Test Complex Philadelphia |
| J. H. Sternbergh & Son – Reading | University of Pennsylvania Law School Philadelphia |
| J. H. Wilcox – Chester | University of Pennsylvania Liberal Arts Philadelphia |
| J. J. De Kinder – Philadelphia | University of Pennsylvania Maloney Building Philadelphia |
| J. J. Felin Co. Inc. – Nicetown | University of Pennsylvania Medical Center Philadelphia |
| J. J. Vandergrift – Pittsburgh | University of Pennsylvania Medical Center, Residence Building Philadelphia |
| J. J. White Co. – Maple Glen | University of Pennsylvania Medical Laboratory Philadelphia |
| J. K Wright & Co. – Philadelphia | University of Pennsylvania Medical School Philadelphia |
| J. K. Mosser Co. – Noxen | University of Pennsylvania Museum Philadelphia |
| J. K. Wright & Co. – Philadelphia | University of Pennsylvania Operating Room Philadelphia |
| J. L Steel Aliquippa | University of Pennsylvania Penthouse Philadelphia |
| J. L Steel Labelle | University of Pennsylvania Social Science Center Philadelphia |
| J. Langdon & Co. Inc. – Shamokin | University of Pennsylvania Steam Distribution System Philadelphia |
| J. Mundell & Co. – Philadelphia | University of Pennsylvania Therapeutic Laboratory Philadelphia |
| J. P. Maloney – Scranton | University of Pennsylvania Veterinary School Philadelphia |
| J. R Whitting Power Plant | University of Pittsburgh – Applied Research Center |
| J. S. & T. Elkinton – Philadelphia | University of Pittsburgh – Bradford Campus – Bradford |
| J. S. Wentz – Mauch Chunk | University of Pittsburgh – Cathedral of Learning Pittsburgh |
| J. T. Bennett Co. – Philadelphia | University of Pittsburgh – Clapp Hall |
| J. W Arrott – Pittsburgh | University of Pittsburgh – Falk Clinic |
| J. W Koch Co. – Harrisburg | University of Pittsburgh – Field House |
| J. W. Arrott – Pittsburgh | University of Pittsburgh – Greensburg |
| J. W. Ivory Co. – Philadelphia | University of Pittsburgh – Gulf Research – Harmarville |
| J. W. Koch Co. – Harrisburg | University of Pittsburgh – Heating Plant |
| J. W. Rex Co. – Lansdale | University of Pittsburgh – Hillman Library |
| J. Wood Co. Conshocken | University of Pittsburgh – Johnstown Campus – Johnstown |
| Jabi Restaurant – Charleroi | University of Pittsburgh – Lothrop Hall |
| Jack Frost Sugar Co. – Philadelphia | University of Pittsburgh – Main Campus Buildings |
| Jack S Pharmacy – Meadville | University of Pittsburgh – Medical Center |
| Jacob H. Bowers Trappe | University of Pittsburgh – Medical School |
| Jacoby Heating Inc – Harrisburg | University of Pittsburgh – Music Building |
| James C Morrissey – Philadelphia | University of Pittsburgh – Pittsburgh |
| James H. Reed Power Station – Pittsburgh | University of Pittsburgh – Salk Hall |
| James Irwin & Co. – Pittsburgh | University Of Pittsburgh – Scaiffe Hall |
| James L. Stuart – Pittsburgh | University of Pittsburgh – Schenley Hall |
| James Lees & Sons Co. – Bridgeport | University of Pittsburgh – School of Health |
| James Martin & Co. – Philadelphia | University of Pittsburgh – Stadium |
| James McKay Co. – McKees Rocks | University of Pittsburgh – Student Union |
| James P Wood Heating Co. – Philadelphia | University of Pittsburgh – The Graduate School |
| James Reed Power Station – Pittsburgh | University of Pittsburgh – Towers |
| James S. Wilson Junior High School – Erie | University of Pittsburgh – Western Psychiatric |
| James Wolfenden – Lock Haven | University Of Pittsburgh, Applied Research Center – Harmaville |
| Jameson Coal & Coke Co. Crab Tree | University Square Condominiums – Pittsburgh |
| Jameson Coal & Coke Co. Greensburg | University Welding Export |
| Jameson Memorial Hospital – New Castle | Upmc McKeesport – McKeesport |
| Jamestown Hospital – Jamestown | Upmc St. Margaret – Lawrence |
| Jamison Coal & Coke Co. Crab Tree | Upper Darby High School – Drexal Hill |
| Jamison Coal & Coke Co. Forbes Road | Upper Milford School – Upper Milford |
| Jamison Coal & Coke Co. Greensburg | Upper Mount Bethel |
| Jamison Coal & Coke Co. Hannastown | Upper Sind Plant Sukkur |
| Jamison Coal & Coke Co. Luxor | Upper St. Clair High School – Upper St. Clair |
| Jamison Coal & Coke Co. Pittsburgh | Upper St. Clair Municipal Building – Upper St. Clair |
| Janney Cylinder – Philadelphia | Upshur Philadelphia |
| Jannison Coal & Coke Co. Forbes Road | Ursinus College- Dining Room – Collegeville |
| Januty Silk Co. Inc. – Scranton | USA Box Eighty-Four |
| Jas F Pennell Co. | Usg Sun Shipbuilding Drydock Chester |
| Jas. Bonar & Co. – Pittsburgh | Uss Chemicals – Nequehoning |
| Jaunty Fabric Corp. – Scranton | Uss Headquarters – Pittsburgh |
| Jawood Lukens – Connellsville | Usx Corp. – Pittsburgh |
| Jawood Lukens Conshohocken | USX Fairless Hills |
| Jayval Marine Corp. – Girard Point | USX Headquarters – Pittsburgh |
| Jb Ellison & Sons – Philadelphia | Usx Irving Works – Pittsburgh |
| JC Penney – Beaver Falls | Usx Irving Works Mifflin |
| JC Penney – Donora | USX Morrisville |
| JC Penney – Johnstown | USX Steel Dravosburg |
| Jeannette District Memorial Hospital – Jeannette | Usx Steel Mill – Brakenridge |
| Jeannette Glass Co. – Jeannette | USX Steel Mill Clairton |
| Jeannette Shade & Novelty Co. – Jeannette | USX Steel Mill Fairless Hills |
| Jeddo Highland Coal Co. – Jeddo | Usx Steel, Clairton Works – Pittsburgh |
| Jefferson & Clearfield Coal & Iron Co. – Ernest | V. C. Golden – Pittsburgh |
| Jefferson Coal Co. – Coal Gle | V. L. Cavannas & Co. Philadelphia |
| Jefferson Court Mall – Washington | V. L. Cavannas Co. – Philadelphia |
| Jefferson Elementary School – Clairton | Valetti Marine Supply Philadelphia |
| Jefferson Hospital – Philadelphia | Valk Manufacturing – Carlisle |
| Jefferson Medical Center – Clairton | Valley Camp Coal Co. Oil City |
| Jefferson Medical College – Philadelphia | Valley Camp Coal Co. Poland |
| Jefferson Medical College Hospital, White Haven Div. | Valley Corp. – Ardmore |
| Jenny Cylinder – Philadelphia | Valley Electric Co. – Fallston |
| Jere Woodring & Co. – Hazleton | Valley Electric Co. New Brighton |
| Jermyn & Co. – Pittston | Valley Elementary School – Jefferson Hills |
| Jermyn Boiler House – Jermyn | Valley Forge Hospital – Phoenixville |
| Jersey Bar & Grill – New Brighton | Valley Forge State Park – Valley Forge |
| Jersey Cereal Food Co. – Irwin | Valley Ice Co. – Beaver Falls |
| Jersey Shore Electric Street Railway Co. – Jersey Shore | Valley Maid Inc. Phoenixville |
| Jersey Shore Steel Co. – Avis | Valley Mill – Colplay |
| Jesse W. Starr Jr. – Philadelphia | Valley Mould & Iron Co. – Sharpsville |
| Jessop Specialty Steel Mill – Washington | Valley Steel – Duquesne |
| Jessop Steel Co. – Washington | Valley Supply Phillipsburg |
| Jessop Steel Plant Washington | Valley Traction Co, Lemoyne – Cumberland County |
| Jessup & Moore, Chester Mills – Modena | Valley Traction Co. – Bridgeport |
| Jetronic Industries – Philadelphia | Valley Traction Co. Lemoyne Cumberland County |
| Jewish Home for The Aged – Philadelphia | Valvoline Oil Co. – Freedom |
| Jewish Hospital – Philadelphia | Valvoline Oil Refinery Freedom |
| Jewish Temple – Allentown | Van Brunt Co. Philadelphia |
| JF Pennell Co. | Van Dorn Co. Heat Tire – McKees Rocks |
| JH France Refractories Co. Snow Shoe | Van Horn Ely – New Brighton |
| Jim Dowdy Cadillac Oldsmobile – Ambridge | Vanadium Alloys Steel Co. – Latrobe |
| Jim Walters Co. – Somerset | Vanadium Alloys Steel Co. Monaca |
| JJ White Jack Smith Fairless Works Morrisville | Vanadium Steel Vanadium Works – Bridgeville |
| JL Republic Hazelwood Pittsburgh | Vanadium Steel Works – Bridgeville |
| Jl Steel Ambridge | Vandergrift Construction Co. – Philadelphia |
| Jl Steel South Side Plant Pittsburgh | Vandergrift Electric Light & Power Co. – Vandergrift |
| Jl-LTV Steel Aliquippa | Vandergrift Elementary School, Vandergrift |
| JNO A. Rigg Philadelphia | Vandergrift Land & Improvement Co. – Vandergrift |
| Jobes St. – Elco | Vare Junior High School – Philadelphia |
| Joel J. Bailey & Co. – Philadelphia | Vasco – Latrobe |
| John A. Rigg Lebanon | Vasco Monaca |
| John A. Rigg Reading | Vaugh Sanitary Bakery – Berwick |
| John B. Kelly Construction – Philadelphia | Vault Co. – Connellsville |
| John B. Stetson Co. – Philadelphia | Vciti Corp. Venture Capital Latrobe |
| John Bartram Senior High School – Philadelphia | Veltry Cleaners Washington |
| John Bistelson Co. – Philadelphia | Venezuela Gulf Refining C Pittsburgh |
| John Bromley & Sons – Philadelphia | Venezuela Gulf Refining Pittsburgh |
| John Brown’s Sons – Philadelphia | Venus Pen & Pencil – Erwinburg |
| John Cohen Clothes – Philadelphia | Verizon Wireless – Cranberry |
| John David Co. – Philadelphia | Vernon Textile Co. – Philadelphia |
| John Dimling – Pittsburgh | Vertal Division Eddystone |
| John F. Casey, Inc. Butler | Vertol Div Boeing Co. Eddystone |
| John F. Casey, Inc. Pullman Standard – Butler | Vesta Coal Co. – Allenport |
| John Harrison Co. Pittsburgh | Vesta Coal Co. Brownsville |
| John J Kane Hospital – Pittsburgh | Vesta Coal Co. California |
| John J. Kane Hospital – Bridgeville | Vesta Coal Co. Pittsburgh |
| John J. Kane Hospital – McKeesport | Vesta Furnace Harrisburg |
| John Lang Paper Co. – Philadelphia | Vesuvius Crucible Co. – Pittsburgh |
| John Lang Philadelphia | Veterans Administration Hospital – Pittsburgh |
| John M Grasse Elementary School – Hilltown | Veterans Hospital – Altoona |
| John Moffet Elementary School – Philadelphia | Veterans Stadium – Philadelphia |
| John Mundell & Co. – Philadelphia | Vick Manufacturing Division – Philadelphia |
| John Potero Co. – Philadelphia | Victor Balata Plant – Easton |
| John R. Ellison & Sons Shop – Butler | Victor Barward Industries – Philadelphia |
| John R. Ellison Sons Shop – Butler | Victor Box Co. Quakertown |
| John S. Pepson – Union City | Victor Chemical Works – Morrisville |
| John Tack & Sons – Butler | Victor Chemical Works Morrisville |
| John Tearney Heating & Plumbing – Lancaster | View Jr. High School – View |
| John Tyson – Moodville | View Water Authority – Neville Island |
| John Veith Colliery – Minersville | Viko Furniture Eldred |
| John Wanamaker Department Store – Philadelphia | Villanova College – Villanova |
| John Wanamaker Store – Kimberton | Villanova University – Villanova |
| John Wood Manufacturing Co. – Connellsville | Villanova University New Law School Building Villanova |
| John Wood Manufacturing Co. – Conshohocken | Villanova University New Law School Villanova |
| John Yewdall Keystone Mills Philadelphia | VIncents Pizza Pub – Trafford |
| John Zimmermann & Sons – Philadelphia | Vine Street Towers – Johnstown |
| John-David Co. – Philadelphia | Vinton Colliery Co. – Vintondale |
| Johnny’s Gas Station – Ambridge | Virginia Plate Glass Co. Pittsburgh |
| Johns-Manville Corp. Pittsburgh | Virginia Power Transmission Co. – Cheat Haven |
| Johns-Manville Corp. Whitehall | Virginia Pulp & Paper Co. – Tyrone |
| Johns-Manville Production Corp. Zeleinople | Virginia Pulp & Paper Co. Tyrone |
| Johnson & Co. – Johnstown | Virginia Pulp & Paper Co. Williamsburg |
| Johnsonburg Elementary School – Johnsonburg | Virginia Pulp Paper Co. Tyrone |
| Johnsonburg Paper Mill – Johnsonburg | Virginia Pulp Paper Tyrone |
| Johnsonville Naval Air & Research Center – Philadelphia | Virginia Railway Co. |
| Johnston Foundry – Grove City | Visco Corp. General Foods – Meadowville |
| Johnston The Florist Irwin | Visco Marcus Hook |
| Johnstown America Corp. – Johnstown | Viscose Co. – Maple Glen |
| Johnstown City Hall – Johnstown | Viscose Co. Meadville |
| Johnstown Coke Oven | Vitro Metals Canonsburg |
| Johnstown Corp. – Johnstown | Vitro Re Metals – Canonsburg |
| Johnstown Elementary School – Johnstown | Vocational Technical School – Delaware City |
| Johnstown High School – Johnstown | Volkswagen Plant – New Stanton |
| Johnstown Stonycreek Railroad – Johnstown | Vornhold Wall Paper – Hulmeville |
| Johnstown Water Authority – Johnstown | Vosters Nurseries – Secane |
| Johnstown Water Co. – Johnstown | Vo-Tech – Johnstown |
| Johnstown Works Powerhouse Johnstown | Voyager Inn – Franklin |
| Jonathan Ring & Son – Philadelphia | Vtasty Baking Co. Inc – Philadelphia |
| Jones & Laughlin Steel Co. Aliquippa | Vulcan Detinning Co. – Nequehoning |
| Jones & Laughlin Steel Co. Braddock | Vulcan Detinning Co. – Neville Island |
| Jones & Laughlin Steel Co. Eliza | Vulcan Foundry & Machine Co. – New Castle |
| Jones & Laughlin Steel Co. Pittsburgh | Vulcan Mold – Latrobe |
| Jones & Laughlin Steel Co. Woodlawn | Vulcanite Paving Co. – Philadelphia |
| Jones & Laughlin Steel Co. Works Station Pittsburgh | Vulcanized Rubber & Plastics Co. – Morrisville |
| Jones & Laughlin Steel Corp. – Elizabeth | W Devees Wood Co. – Pittsburgh |
| Jones & Laughlin Steel Corp. – Vestaburg | W M H Roper Co. Forrest Hills |
| Jones & Laughlin Steel Corp. Solo Works Pittsburgh | W M H Rorer Co. Fort Washington |
| Jones & Laughlin, Limited Pittsburgh | W R Grace & Co. New Castle |
| Jones & Laughline Steel Co. – Woodlawn | W Rose Inc. Sharon Hill |
| Jones & Lockland Steel Mills – Johnstown | W S Rockwell Co. Chalfont |
| Jones & Loughlin Steel Corp. – Aliquippa | W. C. Hamilton & Son – Lafayette |
| Jones Junior High School – Philadelphia | W. C. Hamilton & Sons – Philadelphia |
| Jones Laborlin Steel Pittsburgh | W. Conschohocken Co. |
| Jones Laughlin Steel Braddock | W. D. Reiniger & Sons – Hatboro |
| Jones Laughlin Steel Co. Eliza Furnaces Pittsburgh | W. Dewees Wood Co. – McKeesport |
| Jones Laughlin Steel Co. Hazelwood | W. F. Mosser & Son – Allentown |
| Jones Laughlin Steel Co. LTV Steel Aliquippa | W. F: Mosser & Son – Allentown |
| Jones Laughlin Steel Co. LTV Steel Pittsburgh | W. G Payne & Co. Kingston |
| Jones Laughlin Steel Co. Vestaburg | W. G. Balph Co. – Pittsburgh |
| Jones Laughlin Steel Corp. Coke Oven Plant Aliquippa | W. G. Payne & Co. – Kingston |
| Jones Laughlin Steel Corp. Southside Works Pittsburgh | W. G. Pennypacker – Philadelphia |
| Jones Laughlin Steel Hazelwood- Pittsburgh | W. G. Wilkins Co. – Pittsburgh |
| Jones Lockland Steel Mills – Johnstown | W. Glyde Wilkins, C. E. Pittsburgh |
| Jordan Park Apartments- Boiler House – Fullerton | W. H. Grundy & Co. Bristol |
| Joseph & Thropp – Earlston | W. H. Haws Fire Brick Co. – Mt. Union |
| Joseph Berliner Co. – Philadelphia | W. H. Luden – Reading |
| Joseph Butene – Bradford | W. H. Piper & Co. – Lilly |
| Joseph Campbell Pet Foods – Lime Ridge | W. H. Piper & Co. – Philadelphia |
| Joseph Heacokc – Wyncote | W. J. Hollis – Reading |
| Joseph Horne & Co. – Pittsburgh | W. J. Hunt Carlisle |
| Joseph R. Foster Sons – Philadelphia | W. J. Lawlor – Quakertown |
| Joseph S. Finch & Co. – Schenley | W. J. Mccahan Sugar Refining & Molasses Co. – Philadelphia |
| Joseph S. Finch Co. – Pittsburgh | W. J. Rainey Co. – Connellsville |
| Josephine Furnace & Coke Co. – Josephine | W. K. Niver Coal Co. – Berlin |
| Joy Manufacturing – Franklin | W. M. Anderson – Philadelphia |
| Joy Manufacturing New Philadelphia | W. Newton Co. |
| Joy Manufacturing Reno | W. P. Duckworth Lansdowne |
| JP Austin Associated Inc. Pittsburgh | W. P.O. Railroad – Philadelphia |
| Js & T Elkinton – Philadelphia | W. R. Grace – Ellwood City |
| Jsta. #30 – S.S. Boiler House – Pittsburgh | W. R. Grace – New Castle |
| Julius Kayser Co. Crown Plant – Bangor | W. R. Mcturk Coal Co. – Girardville |
| Juniata Co. – Mufflintown | W. T. Grant Stores – Belle Vernon |
| Juniata County School District Mifflintown | W. W. Armstrong Inc. – Carnegie |
| Juniata Furnace & Foundry Co. – Newport | W. W. Darley – Pittsburgh |
| Junior High School – Dubois | W. W. Harrison Glenside Station |
| Junior High School Aliquippa | Wabash Pitts Railroad Powerhouse – Pittsburgh |
| Justi Division W. Gold Refinery Philadelphia | Wabash Pittsburgh Terminal – Pittsburgh |
| K & L Refractory Service – Erie | Wager & Cox – Bridgeport |
| K L Refractory Service Erie | Wager & Cox Bridgeport |
| K& J Coal Co. – Hastings | Wagoners E C Sons Beaver Falls |
| Kabuda Synthetic Rubber Co. Plant – Monaca | Walgreens – Chippewa Township |
| Kaiser Engineers Bristol | Walker & Keplar – Philadelphia |
| Kaiser Job – Butler | Wall & Shand, Duke & Vine Sts. – Lancaster |
| Kaiser Metal – Bristol | Wallace Junior High School – Baldwin |
| Kamak Mills Kulpmont | Wallace- Murray Scranton |
| Kane Area Junior High School – Kane | Wallace Run Plant |
| Kane Hospital – McKeesport | Wallace-Murray – Scranton |
| Kane Hospital – Ross | Walnut Steam Heat Station Harrisburg |
| Kane School 26Th Jefferson Philadelphia | Walster Corp. – Lackawanna County |
| Kanmak Mills – Kulpmont | Walters Cabinets – Oakmont |
| Karl Lieberknecht Inc. Reading | Waltz Mills – Yukon |
| Karl R.H. Knapp, Inc. – McKees Rocks | Walworth Manufacturing Greensburg |
| Karns City Refinery Karns City | Wampum Cement Plant Wampum |
| Karns City School Karns City | Wanamaker Garage – Philadelphia |
| Katz Underwear Co. – Honesdale | Wanamaker’s Cottman Avenue Philadelphia |
| Kaufman Building – Pittsburgh | Wanamie #18 Colliery Wanamie |
| Kaufmanns Dept. Store – Altoona | Ward S Bakery – Lawrenceville |
| Kaufmanns Dept. Store – Erie | Warden Frew & Co. – Philadelphia |
| Kaufmanns Dept. Store – Monroeville | Warehouse Montgomery |
| Kaufmanns Dept. Store – North Hills | Waren State Boiler House |
| Kaufmanns Dept. Store – South Hills Village | Wark Army Supply – Philadelphia |
| Kaufmanns Dept. Store – Westmoreland Mall – Greensburg | Warner Co. – Bellefonte |
| Kaufmanns- Monroeville | Warner Co. Bellefonte Division Bellefonte |
| Kaufmans Department Store – Pittsburgh | Warner Co. Cedar Hollow Cement Plant Devault |
| Kaul Memorial Hospital – St. Marys | Warner Co. De Vault |
| Kawecki Berylco Hazelton | Warner Co. Philadelphia |
| Kawecki Berylco Industries Reading | Warner Concrete Plant – Devault |
| Kawecki Berylco Industries Temple | Warner Lambert Laboratory Lititz |
| Kawecki Berylco Industries, Inc. Boyertown | Warner Lambert Pharmaceutical Co. – Lititz |
| Kawecki Chemical Co. Boyertown | Warren Generating Station – Starbrick |
| Kawecki Chemical Co. Hoovertown | Warren Power Plant – Kinzua Dam Warren |
| Kawecki Chemical Co. Reading | Warrick Greenhouse – Washington |
| Kawecki Chemical Co. Rupertown | Warrior Run School – Sunberry |
| Kaweener Co. – Bloomsburg | Warwick Iron & Steel Co. – Pottstown |
| Kaweener Co. Harrisburg | Warwick Mine – Greene County |
| Keasbey & Mattison – Philadelphia | Washburn & Zerfass – Scranton |
| Keasbey & Mattison Co. – Ambler | Washburn, Williams & Co. – Scranton |
| Keebler Biscuits Co. – Philadelphia | Washington & Jefferson Elementary School – Altoona |
| Keenan Co. – Philadelphia | Washington Ave. Plant – Scranton |
| Keene Corp. – Valley Forge | Washington Center – New Castle |
| Keibler Industries – New Kensington | Washington Coal & Coke Co. – Star Junction |
| Keibler Thompson Corp. – Export | Washington Coal & Coke Co. Uniontown |
| Keller Creamery – Harleysville | Washington County Courthouse Square – Washington |
| Kelloggs Co. Lancaster | Washington Electric Light & Power Co. – Washington |
| Kellogs Chemical Plant – Oil City | Washington Elementary School – Greenville |
| Kelly & Jones Co. – Greensburg | Washington Elementary School – Washington |
| Kelly & Jones Co. Pittsburgh | Washington Health Center – Washington |
| Kelly & Ludwig – Philadelphia | Washington Hi- Rise – Washington |
| Kelly School – Wilkinsburg | Washington High School – Lilly |
| Kelly Wooden Ware Co. Waterford | Washington High School – Washington |
| Kelsey Hayes Wheel Co. – McKeesport | Washington Housing Project – Washington |
| Kem Weld rt B Kemax Part B | Washington Ice Co. Washington |
| Kemble Iron Co. – Riddlesburg | Washington Jefferson College – Washington |
| Kemmerer Iron & Steel Co. – Scranton | Washington Jefferson Elementary School – Altoona |
| Kendall Oil Co. Bradford | Washington Mall Washington |
| Kendall Refining Bradford | Washington Mold Machine Foundry Co. Washington |
| Kendall Refining Co. – Bradford | Washington Plaza – Washington |
| Kenna Metal – Latrobe | Washington Powerhouse – Danville |
| Kennametal, Inc. – Latrobe | Washington Sewage Collection System – Washington |
| Kennedy Ebensburg Center – Ebenburg | Washington Sewage Treatment Plant – Washington |
| Kennedy Ebensburg Center – PA | Washington Steel – Houston |
| Kennedy Van Saun – Warner Devault | Washington Steel & Ordinance Co. Uniontown |
| Kennedy Van Saun Danville | Washington Steel & Ordnance Co. – Union City |
| Kennedy, Ebensburg Center Ebensbug | Washington Steel Co. – Washington |
| Kennett & Wilmington Electric Railway Co. | Washington Steel Houston |
| Kennett Square | Washington Steel Mill – Washington |
| Kennett Wilmington Electric Railway Co. Kennett | Washington Tin Plate Co. – Washington |
| Kennywood Park – Mifflin | Washington Tool & Machine Co. – Washington |
| Kensington Water Co. New Kensington | Washington Tool Washington |
| Kenyon Theatre North Side – Pittsburgh | Washington Vocational School – Lawrenceville |
| Kepler Mills Easton | Washingtonville Power Plant |
| Keplers Fuel Co. Easton | Washingtonville Power Plant Washingtonville |
| Keppars Co. Petrolia | Water & Power Development Authority, Sukkur |
| Kepper Mountain Power Station – Scranton | Water Co. – Castle Shannon |
| Ketchum Communications Holding Pittsburgh | Water Treatment Plant – Carmichaels |
| Keystone Asbestos Magnesia Co. – Etna | Water Treatment Plant – Connellsville |
| Keystone Box Co. – Sharpsburg | Water Treatment Plant – Hawk Run |
| Keystone Brewers, Inc. – Pittsburgh | Water Treatment Plant – Lewiston |
| Keystone Cement Bath | Water Treatment Plant – New Castle |
| Keystone Coal & Coke Co. Dundale | Water Treatment Plant – South Fayette |
| Keystone Coal & Coke Co. Ellsworth | Water Works Construction Co. & Eastern Tube Co. – Pittsburgh |
| Keystone Coal & Coke Co. Greensburg | Water Works North-Philadelphia |
| Keystone Coal & Coke Co. Madison Mines | Water Works South-Philadelphia |
| Keystone Coal & Coke Co. Madison | Waterworks Mall – Fox Chapel |
| Keystone Coal & Coke Co. New Alexandria | Watson Lands Lumber Co. – Mayburg |
| Keystone Construction Co. – Huntingdon | Watson Standard – Millvale |
| Keystone Drawn Steel – Spring City | Watsontown Door & Sash Co. Watsontown |
| Keystone Drydock – Philadelphia | Waxman Plumbing – Pittsburgh |
| Keystone Elementary School – Knox | Wayne Construction Co. – Greensburg |
| Keystone Engineering Co. – Pittsburgh | Wayne County Memorial Hospital – Honesdale |
| Keystone Generating Station – Plumcreek | Wayne Crouse Shop – Dorseyville |
| Keystone Generating Station Elderton | Wayne Crouse, Inc. – Butler |
| Keystone Generating Station Unit 1 & 2 Elderton | Wayne Feed Co. – Emerson |
| Keystone Generation Station Unit 1 – Alum Creek Township | Wayne Ironworks – Pittsburgh |
| Keystone Pipe & Supply – Butler | Waynesburg Central Greene School – Waynesburg |
| Keystone Plantation – Wyoming | Waynesburg Electric Light & Power Co. Waynesburg |
| Keystone Portland Bath | Waynesburg High School – Waynesburg |
| Keystone Portland Cement Co. – Bath | Waynesburg Prison – Waynesburg |
| Keystone Portland Cement Philadelphia | Wean United Engineering Vandergrift |
| Keystone Power Plant – Indiana | Wean United Foundry Vandergrift |
| Keystone Power Station – Shelocta | Weathercraft Insulation Co. – Philadelphia |
| Keystone Project, Clairton Works – Clairton | Weatherspoong Building – Philadelphia |
| Keystone Project, Westinghouse Electric – Elderton | Weaver Elementary School – South Park |
| Keystone Resources – Mars | Webster Coal & Coke Co. – Amsbry |
| Keystone Roofing Co. – York | Webster Coal & Coke Co. Ehrenfeld |
| Keystone Roofing Manufacturing Co. – York | Webster Coal & Coke Co. Philadelphia |
| Keystone Shaft Mine – Madison | Webster Coal & Coke Co. Scranton |
| Keystone Station Units #1 #2 Armstrong County Shelocta | Webster Furnace – Philadelphia |
| Keystone Station Units 1 & 2 Westinghouse Turbines Shelocta | Weeks Brothers – Pittsburgh |
| Keystone Wire & Iron – Huntingdon Valley | Weigal Buick – Braddock |
| Keystone Woolen Mills – Connellsville | Weightman Building – Philadelphia |
| Keystone Woolen Mills Conshohocken | Weightman Estate – Philadelphia |
| Keystone, Ebensburg Center Ebensbug | Weil McClain – Erie |
| Khulna Newsprint Mill Khulna | Weinberg Louis & Marion – Philadelphia |
| Kibbe, Chaffie & Co. – Philadelphia | Weirton Steel – McKees Rocks |
| Kibbes Specialty Contractors S. Williamsport | Weirton Steel Browns Island McKees Rocks |
| Kieter Magee – Magee Carpet Co. – Bloomsburg | Weirton Steel McKees Rocks |
| Kilsdonk Chemical Drake Chemical – Lock Haven | Weitz & Malano Pennzoil |
| Kim Bob Construction – Harrisburg | Welch Grape Juice Co. – North East |
| Kimberly Clark Corp. – Mt. Holly Springs | Welding Engineers – Norristown |
| Kim-Bob Construction – Harrisburg | Wellman – Seaver Morgan Co. – Erie |
| King Keystone – Warren | Wellman-Seaver Morgan Co. – Erie |
| King Of Prussia – Kimberton | Wellsboro Electric Co. Wellsboro |
| King Of Prussia Shopping Center – Kimberton | Welsbach – State Correctional Institute |
| Kingan & Co. Limited Philadelphia | Welsbach State Correctional Inst. Boiler Plant White Haven |
| Kingston Coal Co. Number 2 & 4 Shaft Kingston | Welsh Grape Juice Co. North East |
| Kingston Colleries | Wenster Coal & Coke Co. Amsbry |
| Kingston Electric Co. – Swiftwater | Wernersville State Hospital – PA |
| Kingston Power Station – Oliphant | Wertz Engineering Co. – Allentown |
| Kinny Shoe Factory – Carlisle | Wessell Hardware Corp. Philadelphia |
| Kinsey Distilling Co. – Linfield | West. Virginia Plate Glass Co. – Pittsburgh |
| Kinzua Dam – Warren | Westerly Parkway School – Star Junction |
| Kiski Area High School – Vandergrift | Westerly Parkway School State College |
| Kiskiminetas Springs School – Kiskiminetas | Western Beaver High School – Beaver |
| Kittanning Brick & Fire Clay Co. – Pittsburgh | Western Electric Co, Inc. – Laureldale |
| Kittanning Ceramics Co. – Kittanning | Western Electric Co. Allentown Works Allentown |
| Kittanning Coal Co. – Kittanning | Western Electric Co. Allentown Works |
| Kittanning Country Club – Kittanning | Western Electric Co. Coo Lauderdale |
| Kittanning Courthouse – Kittanning | Western Electric Co. Inc. – Allentown |
| Kittanning Plate Glass Co. – Kittanning | Western Electric Co. Liberty |
| Kittanning School – Kittanning | Western Electric Co. Reading |
| Klien Chocolate Co. Elizabethtown | Western Electric Co. Repair Facility King of Prussia |
| Klimek – Sewickley | Western Electric Corporation – Beaver |
| Klur Frank Co. Pittsburgh | Western Metal Bed Co. – Philadelphia |
| K-Mart Altoona | Western Penn Beaver City |
| Knabb Barrel Div. – Maple Glen | Western Penn Pittsburgh |
| Knabb Barrel Div. – Marcus Hook | Western Penn Shippingport |
| Knabb Barrel Div. Marcus Hook | Western Penna Hospital – Pittsburgh |
| Knitting Factory – Dallas | Western Pennsylvania Hospital for Insane – Dixmont |
| Knoblit – Richmond Street – Philadelphia | Western Pennsylvania Power Co. – Springdale |
| Knoll Products, Inc. Hanover Township | Western Railroad Co. |
| Knouse Corp. – Peach Bottom | Western State Psychiatric Hospital – Pittsburgh |
| Knouse Corp. Peach Glen, Adams County | Western State School Hospital Canonsburg |
| Knouse Foods Cooperative, Inc. – Orrtanna | Westfield River Paper Co. – Conschohocken |
| Knox Glass Plant – Clarion | Westfield Tanning Co. |
| Kobuta Chemical Plant – Kobuta | Westgate Plaza – New Castle |
| Kolnile Brewing Co. – Philadelphia | Westin William Penn Hotel |
| Koopers-Petrolia Co. | Westinghouse – Pittsburgh |
| Kopp Glass Swissvale | Westinghouse Air Brake Co. – Pittsburgh |
| Koppel Bridge – Koppel | Westinghouse Bettis – Mifflin |
| Koppel Plant – Beaver Falls | Westinghouse Cars & Co. – Philadelphia |
| Koppel Steel Co. – Ambridge | Westinghouse Elec Corp. – Derby |
| Koppel Steel Co. Beaver Falls | Westinghouse Electric & Manufacturing Co. – Essington |
| Koppers – Fairless Hills | Westinghouse Electric Airbrake – Greensburg |
| Koppers Building Pittsburgh | Westinghouse Electric Corp. – Elderton |
| Koppers Chemical – Kobuta | Westinghouse Electric Corp. A B Building – Turtle Creek |
| Koppers Chemical Co. Bridgeville | Westinghouse Electric Corp. Astronuclear Laboratory Large |
| Koppers Co, Inc. – Tar Products Div. – New Norristown | Westinghouse Electric Corp. Atomic Office Large |
| Koppers Co. – Johnstown | Westinghouse Electric Corp. Beaver |
| Koppers Co. Air Reduction Johnstown | Westinghouse Electric Corp. Bettis Atomic Power Lab Mifflin |
| Koppers Co. Aliquippa | Westinghouse Electric Corp. Bettis Atomic Power Lab Pittsburgh |
| Koppers Co. Bridgeville | Westinghouse Electric Corp. Cheswick |
| Koppers Co. Butler | Westinghouse Electric Corp. Derry |
| Koppers Co. Chemical Division Edwin | Westinghouse Electric Corp. Keystone Power Station Elderton |
| Koppers Co. Chemical Division Kobuta Beaver | Westinghouse Electric Corp. Keystone Station – Shelocta |
| Koppers Co. Chemicals Dyestuffs Div. Petrolia | Westinghouse Electric Corp. Keystone Station Units #1 #2 Shelocta |
| Koppers Co. Emporium | Westinghouse Electric Corp. Laboratory Pittsburgh |
| Koppers Co. General Commodities Warehouse Pittsburgh | Westinghouse Electric Corp. Linhart Works Turtle Creek |
| Koppers Co. Inc – Beaver | Westinghouse Electric Corp. Philadelphia Works Lester |
| Koppers Co. Inc. – Chemical Division – Edwin | Westinghouse Electric Corp. Plant A B Building Wilmerding |
| Koppers Co. Inc. – Johnstown | Westinghouse Electric Corp. Plant Receiving Dept Pittsburgh |
| Koppers Co. Inc. – Tar Products Division – Swedeland | Westinghouse Electric Corp. Plant Section Tl #12 Pittsburgh |
| Koppers Co. Inc. Dylite Plant Kobuta | Westinghouse Electric Corp. South Philadelphia Plant Lester |
| Koppers Co. Inc. Petolia Plant Petrolia | Westinghouse Electric Corp. Specialty Metals Plant Blairsville |
| Koppers Co. Josephtown | Westinghouse Electric Corp. Steam Division – Lexington |
| Koppers Co. Kobuta Beaver | Westinghouse Electric Corp. Trafford Works Bailey House Trafford |
| Koppers Co. McKees Rocks | Westinghouse Electric Manufacturing Co. Pittsburgh |
| Koppers Co. Monaca | Westinghouse Electric Plant Greensburg |
| Koppers Co. Monessen | Westinghouse Electric Plant Mark J. Q. Power Plant Pittsburgh |
| Koppers Co. Monroeville | Westinghouse Electro Corp. Westinghouse Astronuclear Lab Large |
| Koppers Co. Neville Island | Westinghouse General Electric & Manufacturing Co. – Pittsburgh |
| Koppers Co. Oil City | Westinghouse High Voltage Insulator Co. – Derry |
| Koppers Co. Organic Materials Div. Oil City | Westinghouse Machine Co. – Pittsburgh |
| Koppers Co. Petrolia | Westinghouse– Pittsburgh |
| Koppers Co. Philadelphia | Westinghouse Plant |
| Koppers Co. Pittsburgh Co. Building 35 Bridgeville | Westinghouse Plant – Pittsburgh |
| Koppers Co. Plastics Division Kobuta | Westinghouse Research Facility – Churchill |
| Koppers Co. Plastics Division Monaca | Westinghouse Reynolds Plant – Greenville |
| Koppers Co. Tar Products Division New Norristown | Westinghouse Ridge St Warehouse Sharon |
| Koppers Co. Tar Products Division Oil City | Westinghouse Turbine Plant – Lester |
| Koppers Co. Tar Products Division Swedeland | Westinghouse Turbine-Generator York Haven |
| Koppers Co. Verona Research Center Verona | Westinghouse Turbines & Generators Shelocta |
| Koppers Fairless Hills | Westinghouse, Church, Kerr & Co. – Cocks Ferry |
| Koppers Pittsburgh Co. – Bridgeville | Westmont High School – Johnstown |
| Koppers Research Lab Monroeville | Westmont Shopping Center – Johnstown |
| Koppers-Kobuta Koppers Chemical – Monaca | Westmoreland Coal Co. – Irwin |
| Korhumel Steel Aluminum Co. – New Castle | Westmoreland Coal Co. Rillton |
| Korvettes Shopping Center – Philadelphia | Westmoreland Coal Co. Yukon |
| Kossman – Green Tree | Westmoreland County Courthouse – Greensburg |
| Kraft Foods – Fogelsville | Westmoreland County Home for The Destitute – Greensburg |
| Kraft Foods Co. – Palmyra | Westmoreland County Prison – Greensburg |
| Kroger Store Butler | Westmoreland Home For the Destitute Greensburg |
| Kutz Engineering Pittsburgh | Westmoreland Mall – Greensburg |
| Kutztown Foundry & Machine – Kutztown | Westmoreland Manor – Greensburg |
| Kutztown Foundry Kutztown | Westmoreland Paper Co. Newton |
| Kutztown High School Kutztown | Westmoreland Railway Co. |
| L & L Heating & Equipment Philadelphia | Westmoreland Water Co. – Derry |
| L & L Manufacturing Co. – Upland | Weston Field – Scranton |
| L & N Railroad – Conway | Westside Osteopathic Hospital – York |
| L & R Construction – Philadelphia | Westvaco – Williamsburg |
| L- Air Liquide Walnut Street Gate Johnstown | Westvaco Corp. Tyrone |
| L Sonneborn Sons Inc. – Daugherty Refinery Div. – Petrolia | Westvaco Pulp & Paper – Tyrone |
| L Winteres – Philadelphia | Westvaco Tyrone |
| L. A. Riley & Co. – Ashland | Westvaco Williamsburg |
| L. A. Riley & Co. Centralia | Wetterau – Belle Vernon |
| L. A. Riley & Co. Philadelphia | Weyerhaeuser Co. – Minquon |
| L. C. Anderson & Sons – Huntingdon | Weyerhaeuser Co. Ridgway |
| L. G.& E. – Paddys Run Station | Weyerhauser, Inc. – Ridgeway |
| L. Goldstein’s & Sons, Inc. – Philadelphia | Weyeth Laboratories, Inc. – Malvern |
| L. H. Parke Co. – Philadelphia | Weyeth Laboratories, Inc. Chester |
| L. H. Prentice Co. – Pittsburgh | Wh Cars & Co. – Philadelphia |
| L. J. Land, Inc. – Reading | Wheatland Tube – Wheatland |
| L. L. Heating Equipment Philadelphia | Wheelabrator Falls Morrisville |
| L. L. Manufacturing Co. Upland | Wheeling Pitt Steel – Monessen |
| L. Laveson & Son – Philadelphia | Wheeling- Pittsburg Steel Corp. Allenport |
| L. M. Bare Paper Co. – Roaring Springs | Wheeling Pittsburgh Steel Co. – Monesson |
| L. N. Railroad Conway | Wheeling-Pittsburgh Steel Corp. Allenport |
| L. O. Bouquin Co. Oil City | Wheeling-Pittsburgh Steel Corp. Pittsburgh |
| L. Sonneborn Sons, Inc. Petrolia | Wheelwright & Mudge – York |
| L. Winteres Philadelphia | White Cross Store – Monroeville |
| La Belle Coal Washer – La Belle | White Haven Div. |
| La Belle Ironworks Allegheny | White Haven Sanitarium – White Haven |
| La Belle Works Allegheny | White Marsh Junction |
| La Brum School – Philadelphia | White Mountain Paper Co. – Portsmouth |
| La Brum School Red Lion Calero Roads Philadelphia | White Pigment Corp. – Kimberton |
| Labor Products & Ice Co. – Brakenridge | White Pigment Corp. King of Prussia |
| Labrobe Steel Co. – Latrobe | Whitehall Cement Co. Annville |
| Lackawanna & Western Railroad Co. | Whitehall Cement Plant – Whitehall |
| Lackawanna & Wyoming Valley Railway Co. – Scranton | Whitehall Portland Cement Co. – Cementon |
| Lackawanna Coal & Coke Co. – Vintondale | WhiteHaven Sanatorium |
| Lackawanna Coal & Coke Co. Wehrum | Whitehaven Sanatorium White Haven |
| Lackawanna Iron & Coal Co. – Scranton | Whitemarsh Township – Montgomery County |
| Lackawanna Iron & Steel Co. – Donaghmore | Whitemarsh Township Incinerator Lafayette Hill |
| Lackawanna Iron & Steel Co. Lebanon | Whiting Corp. – Erie |
| Lackawanna Iron & Steel Co. North Cornwall | Whitlock Auto – Bridgeville |
| Lackawanna Iron & Steel Co. Scranton | Whitman Chocolate – Philadelphia |
| Lackawanna Iron & Steel Co. Vintondale | Whitmarsh Township Incinerator Lafayette |
| Lackawanna Valley Electric Light & Power Co. – Carbondale | Whitmoyer Laboratories – Myerstown |
| Laco Applicators, Inc. – Warren State Boiler House – Warren | Wickes Furniture – Coraopolis |
| Laco McMullen Co. Erie | Wickes Furniture – Monroeville |
| Laco-Mcmullen Co. Inc. – Erie | Wicks Furniture – Robinson Township |
| Ladbrookes – Moon Township | Wicks Men Store – Beaver Falls |
| Laddie Boy Div of N C C P Philadelphia | Widener Building – Philadelphia |
| Laddie Boy Dog Food Company – Philadelphia | Widener University – Chester |
| Lafarge Construction Materials – Mifflin | Widgeon – Chester |
| Lafayette College – Easton | Wiegner Smelting Co. – Philadelphia |
| Lafayette Hotel – Philadelphia | Wilbur Chocolate Co. – Philadelphia |
| L-Air Liquide – Walnut Street Gate – Johnstown | Wilcox Wilford Corp. – Royersford |
| Lake Lynn Powerhouse – Lake Lynn | Wilcox Wilford Corp. Spring City |
| Lakeland Hospital – Lakeland | Wildman & Schwartz – Norristown |
| Lakens Iron & Steel Co. Coatesville | Wildman Arms Apartments – Landsdowne |
| Lancaster Closure Plant – Lancaster | Wildman Jacquard Co. – Norristown |
| Lancaster Cork Works – Lancaster | Wilkes Barre Anthracite Coal Co. – Wilkes Barre |
| Lancaster County Railway & Light Co. – Lancaster | Wilkes Barre Co. – Wilkes Barre |
| Lancaster Floor Plant – Lancaster | Wilkes Barre College – Wilkes Barre |
| Lancaster Floor Plant Building #500 Lancaster | Wilkes Barre Electric Light Co. – Wilkes Barre |
| Lancaster Floor Plant Building 44 Lancaster | Wilkes Barre Gas & Electric Co. – Wilkes Barre |
| Lancaster Malleable Casting Co. – Lancaster | Wilkes Barre Lace Manufacturing – Wilkes Barre |
| Lancaster Malleable Castings Co. – Lancaster | Wilkes Barre Power Plant Wilkes Barre |
| Lancaster Post Office Lancaster | Wilkes Barre Railway Co. – Wilkes Barre |
| Lancaster U. S Post Office Lancaster | Wilkes Barre Steam Heat Co. – Wilkes Barre |
| Lancaster Water Works – Lancaster | Wilkes Barre Steam Heat Co. Wilkes Barre |
| Lance Colliery #11 Plymouth Junction | Wilkes College – Kingston |
| Land Title & Trust Co. – Philadelphia | Wilkesbarre Railway Co. Wilkes Barre |
| Land Title Building | Wilkinsburg & Eat Pittsburgh Railroad – Pittsburgh |
| Land Title Building Philadelphia | Wilkinsburg & Pittsburg Railroad – Pittsburgh |
| Landis Machine Co. – Waynesboro | Wilkinsburg Electric Co. – Wilkinsburg |
| Landis Tool Co. – Waynesboro | Wilkinsburg High School – Wilkinsburg |
| Lane Service Co. – Freeport | Wilkinson & Pittsburgh Street Railway Co. – Rankin |
| Lanehart Co. – Greencastle | Wilkinson & Pittsburgh Street Railway Co. Pittsburgh |
| Lankenau Hospital – Nurses School – Wyndmoor | Willamette Industries Johnsonburg |
| Lankenau Hospital Philadelphia | William A Mc Dowell Jr. Co. Philadelphia |
| Lansdale Tube – Lansdale | William A Shoemaker School – Mackungie |
| Lansdowne Steel & Iron Co. Morton | William Armstrong & Sons – Connellsville |
| Lansdowne Towers, Inc. Alden | William Cramp & Sons – Philadelphia |
| Large Distilling Co. – Wilson | William Cramp & Sons, Ship Engine Building Co. Philadelphia |
| Larson Builders – Allison Park | William F. Forepaugh Jr. & Brothers Philadelphia |
| Larson Supply Reading | William Galloway – Philadelphia |
| Lasko Metal Products, Inc. Westchester | William H. Grundy & Co. – Bristol |
| Latrobe Area Hospital – Latrobe | William H. Ottemiller Co. York |
| Latrobe Brewing Co. Latrobe | William H. Taylor & Co. – Allentown |
| Latrobe Construction – Latrobe | William J. Cramp Elementary School Philadelphia |
| Latrobe Die Casting – Latrobe | William J. Mimm Lancaster Floor Plant – Lancaster |
| Latrobe Electric Steel Co. – Latrobe | William Krause & Sons Cement Co. – Martins Creek |
| Latrobe Foundry & Machine Latrobe | William L. Sayre Junior High School – Philadelphia |
| Latrobe Froge & Spring, Inc. – Latrobe | William Leard Co. – New Brighton |
| Latrobe High School – Latrobe | William Mann Co. – Philadelphia |
| Latrobe Hospital – Latrobe | William Miller & Sons Co. – Pittsburgh |
| Latrobe Steel Works Latrobe | William Penn Colliery – Shenandoah |
| Latrobe Universal Latrobe | William Penn High School – Philadelphia |
| Latrobe Water Authority – Latrobe | William Penn Hotel – Pittsburgh |
| Latrobe Works – Latrobe | William Penn P. O. Montgomery County |
| Laurel Crest Manor – Ebensburg | William Penn P.O. – Lafayette |
| Laurel Intermediate School – New Castle | William Steele Sons Co. – Philadelphia |
| Laurel Run Coal Co. – Miners Mills | William Weightman, Bingham House Philadelphia |
| Laurel Runcoal Co. – Wilkes Barre | William Wharton Jr. Co. – Easton |
| Laureldale Plant – Laureldale | William Whitaker & Sons – Philadelphia |
| Laureldale Plant | Williamette Industries – Johnsonburg |
| Laurelton State Village | Williamsburg Generating Station Williamsburg |
| Lava Crucible Refractories | Williamsgrove Clay Products Bigler |
| Lava Crucilbe Refractories – Zeleinople | Williamson Brothers Co. – Philadelphia |
| Lavino Furnace Co. – Lebanon | Williamson Trade School – Media |
| Lavino Shipping Co. – Philadelphia | Williamsport Area High School – Williamsport |
| Lawrence Cement Co. of Pennsylvania Northampton | Williamsport Free School of Mechanical Trades – Media |
| Lawrence Cement Co. Siegfried | Williamsport Powerhouse – Wiliamsport |
| Lawrence Junction | Williamsport Technical Institute – Wiliamsport |
| Lawrence Village Plaza – New Castle | Williard Inc. King of Prussia |
| Lawton Lease | Williard Ince – Kimberton |
| Leader Publishing – Pittsburgh | Willow Grove Air Station – Willow Grove |
| Leader Publishing Co. – Pittsburgh | Willow Grove Naval Base – Willow Grove |
| League Island Philadelphia | Willow Grove Navan Air Station & Joint Reserve Base – Horsham |
| Leamington School – Pittsburgh | Willow Grove Railway Co. |
| Leamy Home Mount Airy – Philadelphia | Willow Street Steam Plant Philadelphia |
| Lebanon Blast Furnace Co. – Lebanon | Willow Street Vo- Tech Building 1Willow Street |
| Lebanon City County Building – Lebanon | Willowbrook #3 – Plymouth Meeting |
| Lebanon Concentrator Plant – Lebanon | Willson Products Division Reading |
| Lebanon Elementary School – Lebanon | Wilmington Electric Railway Co. |
| Lebanon Furnace Co. Lebanon | Wilmington Refinery Marcus Hook |
| Lebanon Plumbing Supply Co. Lebanon | Wilputte Coke Oven – Philadelphia |
| Lebanon Shops – MT. Lebanon | Wilson & Co. – Sunbury |
| Lebanon Steam Co. – Lebanon | Wilson & Co. Inc – Philadelphia |
| Lebanon Valley College – Annville | Wilson Fitzgibbons Oil Co. – Bradford |
| Lebanon Valley College Vickroy Hall Girls Dorm Annville | Wilson H. Grown, Inc. – Germantown |
| Lebanon Valley Ironworks Lebanon | Wilson Martin Co. Inc. Wilson Martin Div. Philadelphia |
| Lebanon Valley Street Railway Co. – Lebanon | Wilson Safety Products – Reading |
| Lebanon, Wernersville State Hospital – Wernersville | Wilson School District – Sinking Springs |
| Lectromelt – Pittsburgh | Wilson Senior High School – Sinking Springs |
| Ledwig Huntel Co. Sharon Hill | Wilson Snyder Building Pittsburgh |
| Lee Hospital – Johnstown | Wilson-Snyder Centrifugal Pump Co. – Pittsburgh |
| Lee Rubber & Tire Co. – Connellsville | Windber Electric Co. – Wison |
| Lee Rubber Co. Tire Co. Conshohocken | Windber Elementary School – Washington |
| Leechburg Steel Co. – Leechburg | Windber Elementary School – Windber |
| Leechburg Steel Co. Leechburg | Windber Heating Co. – Windber |
| Leechburg Supply Co. – Leechburg | Windber Housing Project – Windber |
| Leeds & Northrop Co. | Windover Junior High School – Greensburg |
| Leeds & Northrup – Philadelphia | Winter Brewery – Pittsburgh |
| Leeds Northrop North Wales | Wire Mill – Johnstown |
| Leetsdale High School – Leetsdale | Wireless Services – Allison Park |
| Leetsdale Industrial Park – Leetsdale | Wirtz A H Inc. – Chester |
| Leetsdale Shipyard Ambridge | Wise – Kingston |
| Lehigh & Wilkes Barre Coal Co. – Ashley | Wise Delicatessen Co. – Berwick |
| Lehigh & Wilkes Barre Coal Co. Colliery #4 Audenried | Wise Foods, Inc. – Berwick |
| Lehigh & Wilkes Barre Coal Co. Empire Colliery #4 Ashley | Wise Potato Chip Co. – Burwick |
| Lehigh & Wilkes Barre Coal Co. Hollenback Colliery #2 Wilkes Barre | Wishart Theater – Philadelphia |
| Lehigh & Wilkes Barre Coal Co. Notingham Colliery | Wishart Theatre – Philadelphia |
| Lehigh & Wilkes Barre Coal Co. Philadelphia | WItChemical Co. Activated Carbon Division Petrolia |
| Lehigh & Wilkes Barre Coal Co. Plymouth | WItChemical Co. Bradford |
| Lehigh & Wilkes Barre Coal Co. Stanton Colliery #4 Ashley | WItChemical Co. Karn City |
| Lehigh & Wilkes Barre Coal Co. Sugar Notch Colliery #9 Sugar Notch | WItChemical Co. Petrolia |
| Lehigh & Wilkes Barre Coal Co. Wanamie Colliery #3 Wanamie | Witco Chemical Corp. – Bradford |
| Lehigh Car Wheel & Axle Co. – Catasauqua | WItco. Chemical Sonneborn Division Petrolia |
| Lehigh Coal & Co. – Hauto | WItco. Corp. Petrolia |
| Lehigh Coal & Co. Nesquehoning | Witmarsh Township Incinerator – Lafayette |
| Lehigh Coal & Co. Tamaqua | Wm Cramp & Sons Ship & Engine Building. Co. – Philadelphia |
| Lehigh Coal & Navagation Co. Hauto | Wm F Forepaugh Jr & Bro. – Philadelphia |
| Lehigh Coal & Navagation Co. Lansford | Wm L. Sayre Jr High School – Philadelphia |
| Lehigh Coal & Navagation Co. Nesquehoning | Wm Penn Hotel – Pittsburgh |
| Lehigh Coal & Navagation Co. Philadelphia | Wm Steele Sons Co. – Philadelphia |
| Lehigh Coal & Navigation Co. Wilkes Barre | Wm Weightman – Philadelphia |
| Lehigh Coke Co. – S. Bethlehem | Wm Whitaker 7 Sons – Philadelphia |
| Lehigh Colliery – Tamaqua | WM. A McDowell Jr. Co. Philadelphia |
| Lehigh County Court House – Allentown | Wm. Cramp & Sons – Philadelphia |
| Lehigh County Home Wescosville | Wm. H. Taylor & Co. – Allentown |
| Lehigh Design Co. – Dravosburg | Wm. Miller & Sons Co. – Pittsburgh |
| Lehigh Division Bethlehem Plant Bethlehem | Wm. Penn High School – Philadelphia |
| Lehigh Dye Finishing Co. Allentown | Wm. Weightman – Philadelphia |
| Lehigh Engineering – Bethlehem | Wm. Whitaker & Sons. – Philadelphia |
| Lehigh Engineering Co. – Plant – Hanover | Wmca Radio Station – Chambersburg |
| Lehigh Engineering Co. Dunmore | Wmmann Co. – Philadelphia |
| Lehigh Foundry Easton | Wolf Building Co. – Philadelphia |
| Lehigh Industrial Power Co. – Hauto | Wolfs Head Oil Refining Co. Inc. Reno |
| Lehigh Industrial Power Co. Stauto | Wolstons Woods N Yd Barge Ldg Line Philadelphia |
| Lehigh Manufacturing Co. – Philadelphia | Wolverine Empire Refinishing Co. Reno |
| Lehigh Material Co. – Philadelphia | Womens Christian Association – Philadelphia |
| Lehigh Navigation Electric Co. – Hanto | Womens Medical College – Philadelphia |
| Lehigh Parkway School – Allentown | Women’s Medical College Hospital – Philadelphia |
| Lehigh Pipe Shop – Bethlehem | Wood John Co. Conshohocken |
| Lehigh Pipe Shop Bethlehem | Wood Mrs Josephine Green Conshohocken |
| Lehigh Portland Cement Allentown | Wood, Alan, Steel Co. Conshohocken |
| Lehigh Portland Cement Co. Allentown | Woodbourne Apartment Association – Levittown |
| Lehigh Portland Cement Co. Bath | Woodings Robert T Inc. Pittsburgh |
| Lehigh Portland Cement Co. Copley | Woodings Verona Steel Works – Verona |
| Lehigh Portland Cement Co. Fogelsville | Woodings Verona Tool Machine – Verona |
| Lehigh Portland Cement Co. New Castle | Woodland Fire Brick Co. – Woodland |
| Lehigh Portland Cement Co. Ormrod | Woodward Inc. Mars |
| Lehigh Portland Cement Co. Paynes Station | Woolworth Building – Lancaster |
| Lehigh Portland Cement Co. Sandts Eddy | Woolworth -Tyrone |
| Lehigh Portland Fogelsville Plant Fogelsville | Works #1 Creighton |
| Lehigh Silk Dyeing Co. Weidmann | Worth Brothers Co. – Coatesville |
| Lehigh University – Bethlehem | Worthington Mushroom Mine, Worthington |
| Lehigh Valley Coal Co. Centralia | WR Grace Wayne Interim Storage Site ssaic County |
| Lehigh Valley Coal Co. Exeter Colliery Pittston | Wright Brothers & Co. – Philadelphia |
| Lehigh Valley Coal Co. Hazleton | Wright Elementary School – Altoona |
| Lehigh Valley Coal Co. Jeansville, Hazelton | Wright Nissan – Wexford |
| Lehigh Valley Coal Co. Mt Carmel | Wright- Patterson Airforce Base |
| Lehigh Valley Coal Co. Orwigsburg | Wright School – Altoona |
| Lehigh Valley Coal Co. Park Place | Wrightstown Elementary School – Bucks County |
| Lehigh Valley Coal Co. Philadelphia | WV Pulp Paper Co. Tyrone |
| Lehigh Valley Coal Co. Pittston Junction | Wyckoff Steel – Ambridge |
| Lehigh Valley Coal Co. Pittston | Wycoff Steel Ambridge |
| Lehigh Valley Coal Co. Wilkes Barre | Wyeth Laboratories Inc. Chester |
| Lehigh Valley Coal Co. Wyoming | Wyeth Laboratories Inc. Malvern |
| Lehigh Valley Cooperative Farmers – Allentown | Wyeth Laboratories Inc. Paoli |
| Lehigh Valley Dairy – Allentown | Wyeth Laboratories Inc. Philadelphia |
| Lehigh Valley Plant Hauto Steam Electric Station Hauto | Wyeth Labs – Philadelphia |
| Lehigh Valley R. R.- Pringle Street Siding – Kingston | Wyeth Labs Chester |
| Lehigh Valley Railroad – Coxton | Wyeth Labs Malvern |
| Lehigh Valley Railroad Co. – Bethlehem | Wyeth Labs Philadelphia |
| Lehigh Valley Supply Allentown | Wykoff Steel – Oakmont |
| Lehigh Valley Traction Co. – Allentown | Wyman Pump – Ridc Park Aspinwall |
| Lehigh Valley Transit Co. – Allentown | Wyoming Ave & G St. – Philadelphia |
| Lehigh Water Co. – Easton | Wyoming County School – Wyoming |
| Lehigh Wilkes Barr Coal Co. – Philadelphia | Wyoming Engineering Co. – Wilkes Barre |
| Lehighs Northamptom Gas Electric Co. – Catasauqua | Wyoming Seminary – Kingston |
| Lehighton Electric Light, Heat & Power Co. – Lehighton | Wyoming Valley Electric Light, Heat & Power Co. – Wilkes Barre |
| Lehighton Post Office – Lehighton | Wyoming Valley Railway Co. |
| Lehighton U. S Post Office – Lehighton | Y & O Coal – Allison Mine – Allison |
| Leicester Continental Mills Co. – Germantown | Y- Auditorium, State Correctional Institution Waymart |
| Leidy School – Philadelphia | Yarn Plant – Beech Creek |
| Leisenring & Co. – Duncott | Y-Auditorium State Correctional Institution |
| Leisenring & Co. Minersville | Yellow Cab Co. Philadelphia |
| Leith Mines – Leith | Yerks & Plumb – Frankford |
| Leith Mines Leith Station | Yewdall & Jones Brothers – Philadelphia |
| Lem Construction – Eighty-Four | YMCA – Lansdale |
| Lemington Nursing Home Liberty | YMCA – Philadelphia |
| Lempiner Roofing & Siding Lebanon | YMCA Auditorium – Ridgway |
| Lenape Elementary School – Ford City | YMCA Auditorium, State Correctional Institution Waymart |
| Lenape Forge, Inc. – Chester | YMCA Building Greensburg |
| Lenhardt Hall, MIllersville University Millersville | YMCA Building Lancaster |
| Leninger Knitting Mills – Mohnton | YMCA Building Lansdale |
| Leninger Knitting Mills Mohnton | YMCA Building New Castle |
| Lenox Crystal – Mt. Pleasant | YMCA Building Philadelphia |
| Lentz & Co. Park Place | YMCA Building Pottstown |
| Lentz Lilly & Co. – Park Place | YMCA Building Sewickley |
| Leonard Brothers – Scranton | Yobe Electric, Inc. Pittsburgh |
| Leopold Vilsack – Pittsburgh | Yoder Industries – York |
| Lester Industrial Building Lester | York City Steam Plant – York |
| Lester Industrial Park – Lester | York Corp. – York |
| Leston Co. – Philadelphia | York Corrugating Co. – York |
| Letort Elementary School – Millersburg | York County Courthouse – York |
| Letterkenny Depot – Letterkenny | York Haven Paper Co. York Haven |
| Letterkenny Ordnance Depot- Field Service Acct – Chambersburg | York Haven Power Station – York Haven |
| Letterkenny Ordnance Depot- Field Service Acct – Letterkenny | York Hospital – York |
| Level Green School Level Green | York International Corp. – York |
| Levinson Steel – McKees Rocks | York Junior College Library York |
| Lewis Block – Pittsburgh | York Manufacturing Co. – York |
| Lewis Elkin Elementary – Philadelphia | York Shipley Inc – York |
| Lewis Foundry & Mach Co. – Pittsburgh | York Water Co. – York |
| Lewis Foundry & Machine Co. – Groveton | Yorkhaven Paper Co. – York Haven |
| Lewis Foundry & Machine Co. – Pittsburgh | Yorktown Theatre – Ogonty |
| Lewis S. Cox & Co. – Philadelphia | Yorktowne Hotel – York |
| Lewistown & Reedsville Electric Railway Co. – Lewistown | Young Door Co. – Sunbury |
| Lewistown Hospital – Lewistown | Young Everett Kinzers |
| Lewistown Smelting Refining Co. Lewistown | Young Mens Christian Association. – Philadelphia |
| Lexington Mead Corp. – Pittsburgh | Youngstown Sheet & Tube Co. – McKees Rocks |
| Liberty Bell Racetrack – Philadelphia | Youngstown Sheet & Tube Co. Coraopolis |
| Liberty High School | Youngstown Sheet & Tube Co. McKees Rocks |
| Liberty Home Dressed Meat Co. – Pittsburgh | Z & L Lumber Co. – Burgettstown |
| Liberty Manufacturing Co. – Pittsburgh | Z & L Lumber Co. – Sharpsburg |
| Liberty Market – Pittsburgh | Z & L Lumber Co. Mercer |
| Liberty Market Co. – Pittsburgh | Zabel Bros. Co. Inc. Philadelphia |
| Liberty Powder Co. – Mt. Braddock | Zack Industries – Reading |
| Liberty School – Pittsburgh | Zausner Foods Corp. – New Holland |
| Library – Castle Shannon | Zedmark, Inc. Valencia |
| Lickdale Iron Co. – Lickdale | Zelienople Disposal – Zelienople |
| Liggett & Myers Tobacco Co. – Philadelphia | Zemperemmi – Clairton |
| Liggett Spring & Axle Co. – Monongahela | Zenith Corp. – Lansdale |
| Light Plant Farmington | Zenith Manufacturing Plant – North Wales |
| Ligonier Elementary- Jr. High School – Ligonier | Zimmerli Gym Lock Haven University – Lock Haven |
| Lilly Washington School – Lilly | Zinc Corp. horsehead Industries – Freedom |
| Limbach Co. – Pittsburgh | Zinc Smelting Division – Monaca |
| Limbach S Pgh Waterhouse Co. – Elrama | Zinman Furs – Philadelphia |
| Limerick Generating Station Pottstown | Zion Industries – Bradford |
| Limerick Nuclear Power Plant – Limerick | Zion Lutheran Church Penbrook |
| Limerick Station – Philadelphia Electric – Pottstown | Zippo Lighter – Bradford |
| Limestone Mine – Bradys Bend | Zonolite Co. New Castle |
| Limestone School – Clarion | Zug & Co. Limited – Pittsburgh |
| Lincoln Coal & Coke Co. – Helen | Zug Iron & Steel Co. – Pittsburgh |
| Lincoln Coal & Coke Co. Scottdale | Zurn Industries, Inc. – Erie City Ironworks |
Malignant Mesothelioma
Malignant Mesothelioma is rare form of cancer that affects lining of the lungs, abdomen, heart, and major organs in the body. Mesothelioma is a disease in which malignant cancer cells are found in the sac lining the chest (pleura) or the abdomen (peritoneum). There are about 3,000 new malignant Mesothelioma cases diagnosed each year in the U. S. If you are experiencing any Mesothelioma symptoms you should contact a doctor immediately.
Diagnosed With Mesothelioma?
If you or a family member has been diagnosed with malignant Mesothelioma you are going to have a lot of questions about living with Mesothelioma and what legal options you have against asbestos manufacturers and asbestos companies for your asbestos exposure. Mesothelioma is a seriously deadly disease. According to the American Cancer Society with the average survival time for people with Mesothelioma is 4-18 months.
Call TOLL FREE 888.640.0914 right now to talk with a live Mesothelioma Counselor that can answer many of your questions and give you the peace of mind that you need.
Family Member Died From Mesothelioma?
If you have a family member that has died from Mesothelioma cancer you should immediately consult with an experienced Mesothelioma diagnosis lawyer about what compensation may be available to you from asbestos trust funds that total more than 30 billion dollars.
It is VERY IMPORTANT that you file your Mesothelioma claim within your states Statute of Limitations.
We have seen many families lose their right to file a lawsuit because their Statute of Limitations had expired while they were grieving. We know it is a tough time to grieve the loss of a loved one, but please do not let your Statute of Limitations expire for filing your Mesothelioma lawsuit. In most states the Statute of Limitations is 2-3 years.
Pennsylvania Mesothelioma Damages
Mesothelioma Latency Period
Mesothelioma has a long latency period of 10-50 years. Many Veterans, Shipyard Workers, Construction Workers, Power Plant Workers, Mill Workers, Steel Workers, Railroad Workers, Pipefitters, Insulators, Electricians, Carpenters, Welders, Auto Mechanics, Veterans, Factory Workers, and laborers are living in the early stages of a variety of asbestos related diseases. Many Mesothelioma lawyers will not accept asbestosis, asbestos lung cancer, pleural plaques, pleural thickening, colon cancer and esophageal cancer cases.
There is More Than 30 Billion Dollars Set Aside for Mesothelioma and Asbestos Victims in Asbestos Bankruptcy Trusts
Need a Mesothelioma Lawyer?
If you or a family member has been diagnosed with Mesothelioma or an asbestos related disease, we can help you start a Mesothelioma lawsuit against asbestos companies responsible for your injuries. Our experienced nationwide Mesothelioma lawyers will come to you.
Call our Mesothelioma Toll Free Helpline at 888.640.0914 and get help today!
24 Hour Live Chat Available. See Chat button on right side of page.
We can usually tell within a few minutes whether we can help you, and if we can’t, maybe direct you to someone who can. We are always accessible by phone, email and online chat.
We are always available to answer your questions with a phone call and will always keep you informed. We will do everything we can to ensure that you receive the highest compensation for your injuries.
If you have a legal question about a Mesothelioma lawsuit, you don’t have to come into our office. Call us, and you’ll speak directly to a lawyer, and if a lawyer is not available, your call will be returned as quickly as possible.
Pennsylvania Mesothelioma Lawsuit – Free Consultation
Our Mesothelioma Lawyers offer you a free no-obligation consultation to determine the merits of your case. During this time, the attorney will be able to access your case and determine your chances for filing a successful Mesothelioma lawsuit. It’s important that you are honest with your Mesothelioma attorney and that you provide as much information as possible regarding your work history, asbestos exposure and current medical condition. During this time your lawyer will explain the legal process to you as it applies to Mesothelioma claims and inform you as to what your expectations should be for a successful outcome.
Pennsylvania Mesothelioma Lawsuit Settlements
The value of your Mesothelioma lawsuit will depend on how many asbestos-containing products you were exposed to, the number of defendants (asbestos companies) available, your age, earning capacity and overall health. Mesothelioma cancers are clearly linked to asbestos exposure.
There is a long history of asbestos companies lying, deceiving, cheating and conspiring to conceal the dangers of asbestos exposure from their workers. It is a documented fact that many asbestos companies knowingly kept their workers in the dark and misled them about safety measures that could have prevented them from getting Mesothelioma and other asbestos-related diseases. A Mesothelioma diagnosis brings financial stress, loss of income, medical expenses, and treatments that may not covered by health insurance. Filing a Mesothelioma lawsuit can help with these added expenses.
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Mesothelioma Settlement Attorneys
Fill out our free Mesothelioma case evaluation form and an experienced mesothelioma lawyer will call you to immediately start processing your claim at no cost to you.