| CICarson Ind/freeport | Freeport, PA | Primary Metal Manufacturing331523 | — | ◇ UNVERIFIED |
| CBCastle Bldr Supply New Castle | New Castle, PA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CBCastle Builders Supply Kittanning Concrete Plt | Kittanning, PA | Nonmetallic Mineral Product Manufacturing327310 | — | ◇ UNVERIFIED |
| CRCastle Rubber Mfg | East Butler, PA | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| CGCaterpillar Global Mining Amer Llc/houston | Houston, PA | Machinery Manufacturing333131 | — | ◇ UNVERIFIED |
| CWCavert Wire | Lemont Furnace, PA | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| CICcf Industries Inc/apollo | Apollo, PA | Wood Product Manufacturing321999 | — | ◇ UNVERIFIED |
| CCegelec | Canonsburg, PA | Machinery Manufacturing333319 | — | ◇ UNVERIFIED |
| CCCemline CORP | Cheswick, PA | Fabricated Metal Product Manufacturing332420 | — | ◇ UNVERIFIED |
| CCentria | Ambridge, PA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| CUCeratizit Usa/latrobe Plt | Latrobe, PA | Machinery Manufacturing333517 | — | ◇ UNVERIFIED |
| COCheckers One Hour Cleaners/washington | Washington, PA | Primary Metal Manufacturing331522 | — | ◇ UNVERIFIED |
| CBChelsea Building Products | Oakmont, PA | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| CPChemstation Pittsburgh | West Newton, PA | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| CMChevron Molycorp Washington Remediation Proj | Washington, PA | Primary Metal Manufacturing331000 | — | ◇ UNVERIFIED |
| CIChromaglass INC | Export, PA | Nonmetallic Mineral Product Manufacturing327212 | — | ◇ UNVERIFIED |
| COCity of Pittsburgh Asphalt Plant | Pittsburgh, PA | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| CSClairton Shipyard | Clairton, PA | Transportation Equipment Manufacturing336611 | — | ◇ UNVERIFIED |
| CSClairton Slag Inc/west Elizabeth Paving Matl Plt | West Elizabeth, PA | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| CIClearwater INC. | Pittsburgh, PA | Chemical Manufacturing325188 | — | ◇ UNVERIFIED |
| CICmc Impact Metals | Chicora, PA | Fabricated Metal Product Manufacturing332811 | — | ◇ UNVERIFIED |
| CNCmi New Castle Facility | New Castle, PA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| CMCodo Manufacturing Corporation | Leetsdale, PA | Miscellaneous Manufacturing339944 | — | ◇ UNVERIFIED |
| CFCol Fin Specialty Steel Mfg | New Brighton, PA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| CSCollier Stone CO - Mcshane Quarry | Carnegie, PA | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ UNVERIFIED |
| CSCommercial Steel Corporation | Glassport, PA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| CPCommunity Prod/farmington | Farmington, PA | Furniture and Related Product Manufacturing337127 | — | ◇ UNVERIFIED |
| CCConsolidated Container Lawrence Cnty | New Castle, PA | Plastics and Rubber Products Manufacturing326160 | — | ◇ UNVERIFIED |
| CUContraves USA | Pittsburgh, PA | Computer and Electronic Product Manufacturing334513 | — | ◇ UNVERIFIED |
| CVCook Vandergrift INC | Leechburg, PA | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| CLCovestro LLC | Pittsburgh, PA | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| CMCowan Metal Finishing CO. | Pittsburgh, PA | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| CPCreative Productions | Pittsburgh, PA | Miscellaneous Manufacturing339950 | — | ◇ UNVERIFIED |
| CHCrouse Hinds Div | Meadow Lands, PA | Fabricated Metal Product Manufacturing332116 | — | ◇ UNVERIFIED |
| CFCumberland Farms INC No 143746 | Zelienople, PA | Petroleum and Coal Products Manufacturing324191 | — | ◇ UNVERIFIED |
| CECurtis-wright Electromechanical CORP | Cheswick, PA | Machinery Manufacturing333911 | — | ◇ UNVERIFIED |
| CMCygnus Mfg CO LLC | Saxonburg, PA | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| DIDaman Industrial Services | East Brady, PA | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| DSDamascus Steel Casting/new Brighton | New Brighton, PA | Printing and Related Support Activities323000 | — | ◇ UNVERIFIED |
| DCDerry Const CO Inc/delmont Plt | Delmont, PA | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| DWDiamond Wire Spring | Pittsburgh, PA | Fabricated Metal Product Manufacturing332611 | — | ◇ UNVERIFIED |
| DCDlubak CORP | Freeport, PA | Nonmetallic Mineral Product Manufacturing327215 | — | ◇ UNVERIFIED |
| DCDme CO | Youngwood, PA | Machinery Manufacturing333511 | — | ◇ UNVERIFIED |
| DSDonaldson Supply CO | Canonsburg, PA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| DCDonegal Crystal USA INC | Jeannette, PA | Nonmetallic Mineral Product Manufacturing327215 | — | ◇ UNVERIFIED |
| DIDre Iii Lp/jeannette | Jeannette, PA | Nonmetallic Mineral Product Manufacturing327212 | — | ◇ UNVERIFIED |
| DTDrilling Tools Charleroi | Charleroi, PA | Machinery Manufacturing333132 | — | ◇ UNVERIFIED |
| DADunningsville Asphalt Plt | Eighty Four, PA | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| DIDynamet INC N Main St Fac | Washington, PA | Primary Metal Manufacturing331491 | — | ◇ UNVERIFIED |
| ELEast Liberty Electroplating INC | Glenshaw, PA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
