| RCRc Concrete | Burgettstown, PA | Nonmetallic Mineral Product Manufacturing327320 | — | ◐ LIKELY ACTIVE |
| RPResco Products Inc/new Castle Plant | New Castle, PA | Nonmetallic Mineral Product Manufacturing327120 | — | ◐ LIKELY ACTIVE |
| RProse plastic USA LLLP | Coal Center, PA | Plastics and Rubber Products Manufacturing326112 | 20–99 | ◐ LIKELY ACTIVE |
| RCRosini Carbons CO Inc/boyers | Boyers, PA | Electrical Equipment, Appliance & Component Manufacturing335991 | — | ◐ LIKELY ACTIVE |
Rpm Industries | Washington, PA | Transportation Equipment Manufacturing336390 | 20–99 | ◐ LIKELY ACTIVE |
| RHRwe Holding CO - West Pittsburg Plant | New Castle, PA | Nonmetallic Mineral Product Manufacturing327999 | — | ◐ LIKELY ACTIVE |
| SPSaxonburg, PA | Saxonburg, PA | Miscellaneous Manufacturing339112 | 100–499 | ◐ LIKELY ACTIVE |
| SUSchawk USA LLC | East Butler, PA | Printing and Related Support Activities323113 | — | ◐ LIKELY ACTIVE |
| SISelect Industries INC - New Castle Facility | New Castle, PA | Printing and Related Support Activities323111 | — | ◐ LIKELY ACTIVE |
| SFSharkskin Finishings/butler | Butler, PA | Fabricated Metal Product Manufacturing332812 | — | ◐ LIKELY ACTIVE |
| SMSkovira Machine CO | Scottdale, PA | Fabricated Metal Product Manufacturing332710 | — | ◐ LIKELY ACTIVE |
| SMSkyline Metals Llc/slag Processing Plt | Baden, PA | Nonmetallic Mineral Product Manufacturing327992 | — | ◐ LIKELY ACTIVE |
| SESony Electronics Inc/new Stanton | Mount Pleasant, PA | Computer and Electronic Product Manufacturing334310 | — | ◐ LIKELY ACTIVE |
| SPSpringfield Pike Quarry | Connellsville, PA | Machinery Manufacturing333314 | — | ◐ LIKELY ACTIVE |
| SPStellar Precision Components. LTD. | Jeannette, PA | Fabricated Metal Product Manufacturing332710 | — | ▲ REPORTED CLOSED |
| SYStock Yards a Division of US Foods INC. | Greensburg, PA | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
| SCStone & CO INC Canonsburg Plt | Canonsburg, PA | Nonmetallic Mineral Product Manufacturing327320 | — | ◐ LIKELY ACTIVE |
| SFSuperior Forge and Steel | Pittsburgh, PA | Primary Metal Manufacturing331221 | 20–99 | ◐ LIKELY ACTIVE |
| TMTech Met, Inc. - Donora | Donora, PA | Fabricated Metal Product Manufacturing332710 | 20–99 | ◐ LIKELY ACTIVE |
| TATenaris Ambridge | Ambridge, PA | Primary Metal Manufacturing331110 | 20–99 | ◐ LIKELY ACTIVE |
| TBThe Bauer Company INC. | Worthington, PA | Nonmetallic Mineral Product Manufacturing327331 | 20–99 | ◐ LIKELY ACTIVE |
| TPThe Perryman CO - Titanium Melting Facility - Phase 3 | Coal Center, PA | Primary Metal Manufacturing331410 | — | ◐ LIKELY ACTIVE |
| TOTherm O Rock INC - New Eagle Plant | New Eagle, PA | Chemical Manufacturing325612 | — | ◐ LIKELY ACTIVE |
| TSTooling Specialists, INC. | Latrobe, PA | Fabricated Metal Product Manufacturing332710 | — | ◐ LIKELY ACTIVE |
| TTTsi Titanium INC. | Derry, PA | Primary Metal Manufacturing331491 | 20–99 | ◐ LIKELY ACTIVE |
| TTTurbo Technologies, INC. | Beaver Falls, PA | Machinery Manufacturing333112 | — | ◐ LIKELY ACTIVE |
| TSTygart Steel | Mckeesport, PA | Primary Metal Manufacturing331221 | 20–99 | ◐ LIKELY ACTIVE |
| TATYK America | Clairton, PA | Nonmetallic Mineral Product Manufacturing327120 | 20–99 | ◐ LIKELY ACTIVE |
| UPUltra Precision | Freeport, PA | Machinery Manufacturing333514 | 20–99 | ◐ LIKELY ACTIVE |
| UCUniontown Concrete Plt | Hopwood, PA | Nonmetallic Mineral Product Manufacturing327320 | — | ◐ LIKELY ACTIVE |
| UPUnited Plate Glass Company (Butler) | Butler, PA | Nonmetallic Mineral Product Manufacturing327215 | 100–499 | ◐ LIKELY ACTIVE |
| UEUniversal Elec Bus | Canonsburg, PA | Electrical Equipment, Appliance & Component Manufacturing335313 | — | ◐ LIKELY ACTIVE |
| VMVandergrift/ Metals Processing Facility | Vandergrift, PA | Fabricated Metal Product Manufacturing332710 | — | ◐ LIKELY ACTIVE |
| VUVentana USA Building I | Export, PA | Plastics and Rubber Products Manufacturing326199 | 20–99 | ◐ LIKELY ACTIVE |
| VIVersatech Incorporated | Greensburg, PA | Fabricated Metal Product Manufacturing332710 | 20–99 | ◐ LIKELY ACTIVE |
| VPVesuvius Penn Wampum/lawrence | Wampum, PA | Nonmetallic Mineral Product Manufacturing327120 | — | ◐ LIKELY ACTIVE |
| VVinoski | Rostraver, PA | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| VMVista Metals/kittanning Plt | Kittanning, PA | Machinery Manufacturing333511 | — | ◐ LIKELY ACTIVE |
| VDVogel Dspl Svc | Mars, PA | Fabricated Metal Product Manufacturing332812 | — | ◐ LIKELY ACTIVE |
| WPWashington Penn - Arden | Washington, PA | Chemical Manufacturing325991 | 100–499 | ◐ LIKELY ACTIVE |
| WPWashington Penn Plas/performance Prod Div | Eighty Four, PA | Chemical Manufacturing325991 | — | ◐ LIKELY ACTIVE |
| WPWestern Pennsylvania Steel Fabricating, INC. | New Castle, PA | Fabricated Metal Product Manufacturing332313 | 20–99 | ◐ LIKELY ACTIVE |
| WSWestmoreland Steel and Fabrication, INC. | Madison, PA | Fabricated Metal Product Manufacturing332312 | 1–19 | ◐ LIKELY ACTIVE |
| WAWiest Asphalt Prod - Butler Facility | Butler, PA | Petroleum and Coal Products Manufacturing324121 | — | ◐ LIKELY ACTIVE |
| WKWorld Kitchen LLC - Charleroi Plant | Charleroi, PA | Nonmetallic Mineral Product Manufacturing327212 | — | ◐ LIKELY ACTIVE |
| XTXaloy Tanner Plating Div | New Castle, PA | Fabricated Metal Product Manufacturing332813 | — | ◐ LIKELY ACTIVE |
| ZDZwaan Dry Clnr/canonsburg | Canonsburg, PA | Primary Metal Manufacturing331520 | — | ◐ LIKELY ACTIVE |
| ANAccelight Networks INC | Bridgeville, PA | Computer and Electronic Product Manufacturing334419 | — | ◐ LIKELY ACTIVE |
| ACAdvanced Coil Industries | Washington, PA | Fabricated Metal Product Manufacturing332812 | — | ◐ LIKELY ACTIVE |
| APAdvanced Polymer Technology | Harmony, PA | Chemical Manufacturing325510 | — | ◐ LIKELY ACTIVE |