| ATAfl Telecommunications LLC | Duncan | SC | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| ATAfl Telecommunications LLC | Duncan | SC | Primary Metal Manufacturing331315 | — | ◇ UNVERIFIED |
| ATAfl Telecommunications LLC | Duncan | SC | Electrical Equipment, Appliance & Component Manufacturing335932 | — | ◇ UNVERIFIED |
| CICameron International CORP | Duncan | OK | Computer and Electronic Product Manufacturing334513 | — | ◇ UNVERIFIED |
| CDCryovac Division Sealed Air Corporation | Duncan | SC | Plastics and Rubber Products Manufacturing326113 | — | ◇ UNVERIFIED |
| HEHalliburton Energy Services, INC. | Duncan | OK | Machinery Manufacturing333132 | — | ◇ UNVERIFIED |
| OCOwens Corning Insulating Systems LLC | Duncan | SC | Primary Metal Manufacturing331314 | — | ◇ UNVERIFIED |
| WCWabco CORP | Duncan | SC | Transportation Equipment Manufacturing336510 | — | ◇ UNVERIFIED |
| AGAfl Global | Duncan | SC | Electrical Equipment, Appliance & Component Manufacturing335921 | — | ◇ UNVERIFIED |
| AJA J Equipment Company Duncan | Duncan | SC | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| DBDuncan #2 Batch Plant | Duncan | OK | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| ESEngelhard Surface Technologies | Duncan | SC | Beverage and Tobacco Product Manufacturing312230 | — | ◇ UNVERIFIED |
| HDHalliburton Duncan Field Camp | Duncan | OK | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| HIHaulmark Industries INC | Duncan | OK | Transportation Equipment Manufacturing336212 | — | ◇ UNVERIFIED |
| HMHayssen Manufacturing Company | Duncan | SC | Fabricated Metal Product Manufacturing332410 | — | ◇ UNVERIFIED |
| HCHemmelrath Coatings INC | Duncan | SC | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| HSHoneywell Spartanburg | Duncan | SC | Transportation Equipment Manufacturing336320 | — | ◇ UNVERIFIED |
| IDImt Duncan LLC | Duncan | SC | Fabricated Metal Product Manufacturing332811 | — | ◇ UNVERIFIED |
| MMMk Metalfoils USA INC | Duncan | SC | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| MCMocom Compounds Corporation | Duncan | SC | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| OEOpmobility Exterior Usa, LLC | Duncan | SC | Transportation Equipment Manufacturing336390 | — | ◇ UNVERIFIED |
| SPSouthwest Plating INC / Duncan Plating Facility | Duncan | OK | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| WWastequip/lm | Duncan | SC | Fabricated Metal Product Manufacturing332439 | — | ◇ UNVERIFIED |
| DRDuncan Recycling and Refining LLC | Duncan | OK | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| 1U115 Usac Drive | Duncan | SC | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| ATAmamco Tool & Supply CO INC | Duncan | SC | Machinery Manufacturing333512 | — | ◇ UNVERIFIED |
| BRBluedot Ready Mix-duncan (plant #111) | Duncan | SC | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| BSBrenntag Southeast INC | Duncan | SC | Petroleum and Coal Products Manufacturing324191 | — | ◇ UNVERIFIED |
 Crane 1 Services | Duncan | SC | Machinery Manufacturing333923 | — | ◇ UNVERIFIED |
| JDJocassee Designs | Duncan | SC | Textile Product Mills314999 | — | ◇ UNVERIFIED |
| MIMetcoat, INC. | Duncan | OK | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| MMichelin:duncan | Duncan | SC | Plastics and Rubber Products Manufacturing326211 | — | ◇ UNVERIFIED |
| MHMowdy Holdings LLC | Duncan | OK | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| NONational Oilwell Varco, L.p. | Duncan | OK | Machinery Manufacturing333911 | — | ◇ UNVERIFIED |
| OSOklahoma Superior Plating, L.l.c. | Duncan | OK | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| OPO-tex Pumping, L.l.c. | Duncan | OK | Machinery Manufacturing333132 | — | ◇ UNVERIFIED |
| PSPlasman Sc INC | Duncan | SC | Transportation Equipment Manufacturing336390 | — | ◇ UNVERIFIED |
| RERockwater Energy Solutions | Duncan | OK | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| SISiemens Industry INC -scc Enterprise Campus Authority '94 Warehouse | Duncan | SC | Electrical Equipment, Appliance & Component Manufacturing335313 | — | ◇ UNVERIFIED |
| SCSloan Construction:#14-closed | Duncan | SC | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| SCSloan Construction Company INC | Duncan | SC | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| SHSolitaire Homes, INC. | Duncan | OK | Wood Product Manufacturing321991 | — | ◇ UNVERIFIED |
| TTTasty Toppings INC | Duncan | NE | Food Manufacturing311941 | — | ◇ UNVERIFIED |
| UTUnited Tool & Mold INC | Duncan | SC | Machinery Manufacturing333511 | — | ◇ UNVERIFIED |
| WMWyoming Machine, LLC | Duncan | SC | Machinery Manufacturing333519 | — | ◇ UNVERIFIED |
