| NNobelclad | Mount Braddock, PA | Fabricated Metal Product Manufacturing332313 | 20–99 | ◐ LIKELY ACTIVE |
| PSPenn State Special Metals LLC | Koppel, PA | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| PPPiad Precision Casting/hempfield Twp Plt | Greensburg, PA | Primary Metal Manufacturing331420 | — | ◐ LIKELY ACTIVE |
| PSPraxair Surface Technologies-spray Plant | New Castle, PA | Fabricated Metal Product Manufacturing332812 | — | ◐ LIKELY ACTIVE |
| PPPremier Pan CO INC | Crescent, PA | Fabricated Metal Product Manufacturing332119 | 100–499 | ◐ LIKELY ACTIVE |
| PFProminent Fluid Controls, INC. | Pittsburgh, PA | Machinery Manufacturing333318 | 100–499 | ◐ LIKELY ACTIVE |
| RIReaxis INC | Mc Donald, PA | Chemical Manufacturing325130 | — | ◐ LIKELY ACTIVE |
| RIRegal Industrial Corporation | Donora, PA | Fabricated Metal Product Manufacturing332312 | 100–499 | ◐ LIKELY ACTIVE |
| RMRitchey Metals CO Inc/hendersonville Plt | Canonsburg, PA | Primary Metal Manufacturing331314 | — | ◐ LIKELY ACTIVE |
| SCShell Chemical Appalachia LLC | Monaca, PA | Chemical Manufacturing325110 | — | ◐ LIKELY ACTIVE |
| SCSippel CO INC Dba Sippel Steel Fab | Ambridge, PA | Fabricated Metal Product Manufacturing332312 | 100–499 | ◐ LIKELY ACTIVE |
| SFStandard Forged Products | Mc Kees Rocks, PA | Fabricated Metal Product Manufacturing332111 | 20–99 | ◐ LIKELY ACTIVE |
| SHStandard Horse Nail Corporation | New Brighton, PA | Fabricated Metal Product Manufacturing332510 | 20–99 | ◐ LIKELY ACTIVE |
| TFTeledyne Flir Defense INC | Freeport, PA | Nonmetallic Mineral Product Manufacturing327215 | — | ◐ LIKELY ACTIVE |
| TTThermal Transfer CORP | Duquesne, PA | Fabricated Metal Product Manufacturing332410 | — | ◐ LIKELY ACTIVE |
| TSThe Sherwin Williams Co/rochester Plt | Rochester, PA | Chemical Manufacturing325510 | — | ◐ LIKELY ACTIVE |
The Smokey City's 412 Barbecue LLC | Pittsburgh, PA | Food Manufacturing311942 | — | ◐ LIKELY ACTIVE |
| TPTri-state Plastics, INC. | Coraopolis, PA | Plastics and Rubber Products Manufacturing326199 | 20–99 | ◐ LIKELY ACTIVE |
| UUUnivar USA INC - Bunola Facility | Bunola, PA | Chemical Manufacturing325180 | — | ◐ LIKELY ACTIVE |
| UCUss Corp/edgar Thomson Works | Braddock, PA | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| UMUss Mon Valley Works - Irvin Plant | West Mifflin, PA | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| USUS Steel Mon Valley Works - Clairton Plant | Clairton, PA | Petroleum and Coal Products Manufacturing324110 | — | ◐ LIKELY ACTIVE |
| VMVista Metals INC | Mckeesport, PA | Machinery Manufacturing333514 | 20–99 | ◐ LIKELY ACTIVE |
| VCVorteq Coil Finishers/valencia Plt | Valencia, PA | Fabricated Metal Product Manufacturing332114 | — | ◐ LIKELY ACTIVE |
| VRVs Rubber | Lebanon, PA | Petroleum and Coal Products Manufacturing324199 | — | ◐ LIKELY ACTIVE |
| WIWoodward, Incorporated | Mars, PA | Fabricated Metal Product Manufacturing332114 | 20–99 | ◐ LIKELY ACTIVE |
| YGYoung Galvanizing | Pulaski, PA | Fabricated Metal Product Manufacturing332812 | — | ◐ LIKELY ACTIVE |
| ADAiro Die Casting INC | Loyalhanna, PA | Primary Metal Manufacturing331521 | — | ◐ LIKELY ACTIVE |
| ALAllegheny Ludlum CORP | Vandergrift, PA | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| BMBerry Metal CO | Zelienople, PA | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| BABraeburn Alloy Steel Rolling Mill Fac | Lower Burrell, PA | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| DFDairy Farmers of Amer | New Wilmington, PA | Food Manufacturing311513 | — | ◐ LIKELY ACTIVE |
| DMDf Mfg Inc/hydro Carbide Tool CO | Latrobe, PA | Fabricated Metal Product Manufacturing332117 | — | ◐ LIKELY ACTIVE |
| EHEastern Hardwoods INC - Hopwood Sawmill | Hopwood, PA | Wood Product Manufacturing321113 | — | ◐ LIKELY ACTIVE |
| EIErsvin Inds. INC. Amasteel Div. | Butler, PA | Nonmetallic Mineral Product Manufacturing327910 | — | ◐ LIKELY ACTIVE |
| HMHarsco Metals - Butler | Butler, PA | Nonmetallic Mineral Product Manufacturing327992 | — | ◐ LIKELY ACTIVE |
| HMHoltec Manufacturing | East Pittsburgh, PA | Fabricated Metal Product Manufacturing332420 | — | ◐ LIKELY ACTIVE |
| MUMarcegaglia USA Munhall Plant | Munhall, PA | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| MTMcconway & Torley LLC - Steel Castings Mfg Plant | Pittsburgh, PA | Primary Metal Manufacturing331513 | — | ◐ LIKELY ACTIVE |
| MSMine Safety Appliances CO | Cranberry Township, PA | Computer and Electronic Product Manufacturing334513 | — | ◐ LIKELY ACTIVE |
| NCNalco CO North/south Plants | Ellwood City, PA | Food Manufacturing311942 | — | ◐ LIKELY ACTIVE |
| NPNational Polymers INC | Charleroi, PA | Chemical Manufacturing325510 | — | ◐ LIKELY ACTIVE |
| NMNf & M Intl Monaca Plt | Monaca, PA | Primary Metal Manufacturing331491 | — | ◐ LIKELY ACTIVE |
| PEPgh Elec Insulation Inc/munhall | Munhall, PA | Nonmetallic Mineral Product Manufacturing327999 | — | ◐ LIKELY ACTIVE |
| PIPpg Ind/chem Tech Ctr | Monroeville, PA | Chemical Manufacturing325130 | — | ◐ LIKELY ACTIVE |
| PIPpg Ind Inc/springdale | Springdale, PA | Chemical Manufacturing325510 | — | ◐ LIKELY ACTIVE |
| TITms International Llc/new Castle Plant | New Castle, PA | Nonmetallic Mineral Product Manufacturing327999 | — | ◐ LIKELY ACTIVE |
| TCTube City Ims/slag Processing | Braddock, PA | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| UEUnion Electric Steel CORP | Burgettstown, PA | Nonmetallic Mineral Product Manufacturing327310 | — | ◐ LIKELY ACTIVE |
| VPValmont Pittsburgh Galvanizing | Midland, PA | Fabricated Metal Product Manufacturing332812 | — | ◐ LIKELY ACTIVE |