| SCSpring City Electrical Mfg. Co. | Spring City | PA | 100–499 | ◐ LIKELY ACTIVE |
| SFStateline Foundries Inc | Roscoe | IL | 20–99 | ◐ LIKELY ACTIVE |
| SFSuperior Forge and Steel | Pittsburgh | PA | 20–99 | ◐ LIKELY ACTIVE |
| TFTalladega Foundry & Machine Company | Talladega | AL | 20–99 | ◐ LIKELY ACTIVE |
| TFTaylor & Fenn CO | Windsor | CT | 20–99 | ◐ LIKELY ACTIVE |
| TFTaylor Foundry | Wichita Falls | TX | 20–99 | ◐ LIKELY ACTIVE |
| TFTexaloy Foundry | Floresville | TX | 20–99 | ◐ LIKELY ACTIVE |
| TCThe Chris Erhart Foundry and Machine Co. | Cincinnati | OH | 1–19 | ◐ LIKELY ACTIVE |
| TGThompson Gundrilling INC | Van Nuys | CA | 20–99 | ◐ LIKELY ACTIVE |
| TFTonkawa Foundry, Inc | Tonkawa | OK | 20–99 | ◐ LIKELY ACTIVE |
| TFTownley Foundry & Machine Company, INC | Candler | FL | 100–499 | ◐ LIKELY ACTIVE |
| TFTrumbull Foundry and Alloy Federal Street | Niles | OH | 20–99 | ◐ LIKELY ACTIVE |
| UMUlven Machinery Co, INC | Hubbard | OR | — | ◐ LIKELY ACTIVE |
| VMVestal Manufacturing Company | Sweetwater | TN | 100–499 | ◐ LIKELY ACTIVE |
| VLVictaulic Lawrenceville | Tioga | PA | 100–499 | ◐ LIKELY ACTIVE |
| WFWaukesha Foundry INC | Waukesha | WI | — | ◐ LIKELY ACTIVE |
| WTWear Tek | Spokane | WA | 20–99 | ◐ LIKELY ACTIVE |
| WFWinnebago Foundry INC | South Beloit | IL | 20–99 | ◐ LIKELY ACTIVE |
| ARAlloys Resources | Albertville | AL | — | ◇ UNVERIFIED |
| AFAmerican Foundry Group / American Alloy Ii | Muskogee | OK | — | ◇ UNVERIFIED |
| AFAmerican Foundry Group LLC - Bixby | Bixby | OK | — | ◇ UNVERIFIED |
| ASAmerican Spincast INC (dba Amstock Supply) | Belton | TX | — | ◇ UNVERIFIED |
| ASAmerican Steel Foundries - Granite City | Granite City | IL | — | ◇ UNVERIFIED |
| AWAmerican Welding & Tank LLC | West Jordan | UT | — | ◇ UNVERIFIED |
| ARAmsted Rail Company, INC | Keokuk | IA | — | ◇ UNVERIFIED |
| ARArmsted Rail Company INC | Hammond | IN | — | ◇ UNVERIFIED |
| BBBahr Brothers Manufacturing, INC. | Marion | IN | — | ◇ UNVERIFIED |
| BCBay Cast INC | Bay City | MI | — | ◇ UNVERIFIED |
| BCBesser CO | Sioux City | IA | — | ◇ UNVERIFIED |
| BQBesser Quinn Machine & Foundry | Boone | IA | — | ◇ UNVERIFIED |
| BFBoyertown Foundry Company | New Berlinville | PA | — | ◇ UNVERIFIED |
| BABradken Atlas | Tacoma | WA | — | ◇ UNVERIFIED |
| BHBrembo Homer Foundry | Homer | MI | — | ◇ UNVERIFIED |
| BIBrewton Iron Works INC | Brewton | AL | — | ◇ UNVERIFIED |
| CUCastings USA INC | New Philadelphia | OH | — | ◇ UNVERIFIED |
| CICaterpillar INC - Mapleton Facility | Mapleton | IL | — | ◇ UNVERIFIED |
| CCCentral Castings CORP | Anniston | AL | — | ◇ UNVERIFIED |
| CPCharlotte Pipe and Foundry Company | Charlotte | NC | — | ◇ UNVERIFIED |
| CMCharter Manufacturing CO INC | Woodstock | IL | — | ◇ UNVERIFIED |
| CVClow Valve CO - Foundry | Oskaloosa | IA | — | ◇ UNVERIFIED |
| CWClow Water Systems Company | Coshocton | OH | — | ◇ UNVERIFIED |
| CCCol-pump Company, INC. (0215010001) | Columbiana | OH | — | ◇ UNVERIFIED |
| CFColumbiana Foundry CO | Columbiana | OH | — | ◇ UNVERIFIED |
| CDCrouse-hinds Div of Cooper Inds | Amarillo | TX | — | ◇ UNVERIFIED |
| CCCrown Casting INC | Hodges | SC | — | ◇ UNVERIFIED |
| CPCulvert Placement and Storage Area Expansion for Waupaca Foundry Plant 5 Facilit | Tell City | IN | — | ◇ UNVERIFIED |
| DCDalton CORP Warsaw Mfg Facility | Warsaw | IN | — | ◇ UNVERIFIED |
| DFDecatur Foundry, INC. | Decatur | IL | — | ◇ UNVERIFIED |
| DFDeeter Foundry | Lincoln | NE | — | ◇ UNVERIFIED |
| DIDenison Industries Main Foundry | Denison | TX | — | ◇ UNVERIFIED |