| TSThe Shredder Company | Canutillo | TX | — | ◇ UNVERIFIED |
| TPThreaded Products CO | Richmond | MI | — | ◇ UNVERIFIED |
| TPThreaded Products CO | Richmond | MI | — | ◇ UNVERIFIED |
| TBThunder Bay Foundry | Alpena | MI | — | ◇ UNVERIFIED |
| TFTomahawk Foundary, INC | Rice Lake | WI | — | ◇ UNVERIFIED |
| TKTool King INC | Wheeling | IL | — | ◇ UNVERIFIED |
 Travis Pattern Foundry | Spokane Valley | WA | — | ◇ UNVERIFIED |
| TITree Island Steel Dba Tree Island Wire USA INC | San Bernardino | CA | — | ◇ UNVERIFIED |
| TFTroy Foundry (screening Plant) | Adger | AL | — | ◇ UNVERIFIED |
| TPTyler Pipe CO | Tyler | TX | — | ◇ UNVERIFIED |
| UEUnion Electric Akers | Avonmore | PA | — | ◇ UNVERIFIED |
| USUnited States Pipe and Foundry Company Dba U.s. Pi | Union City | CA | — | ◇ UNVERIFIED |
| USUnited States Pipe & Foundry Company LLC | Naperville | IL | — | ◇ UNVERIFIED |
| UDU.s. Department of Labor-osha | Red Bud | IL | — | ◇ UNVERIFIED |
| UDUS Dol Osha Fort Lauderdale Ao | Medley | FL | — | ◇ UNVERIFIED |
| UOUsdol Osha - (mobile) | Phenix City | AL | — | ◇ UNVERIFIED |
| UOUsdol Osha- North Aurora | South Beloit | IL | — | ◇ UNVERIFIED |
| UOUsdol Osha- North Aurora | Galena | IL | — | ◇ UNVERIFIED |
| USU S Foundry & Manufacturing | Tampa | FL | — | ◇ UNVERIFIED |
| UCUsg Ceilings Plus LLC | Commerce | CA | — | ◇ UNVERIFIED |
| ULUS Lock & Hdwr Co/columbia | Columbia | PA | — | ◇ UNVERIFIED |
| UHUsp Holdings INC | Warren | OR | — | ◇ UNVERIFIED |
| UPU.s. Pipe Fabrication | Olivehurst | CA | — | ◇ UNVERIFIED |
| UPUS Pipe & Foundry CO | Birmingham | AL | — | ◇ UNVERIFIED |
| USU S Pipe & Foundry Company INC | Burlington Township | NJ | — | ◇ UNVERIFIED |
| USUS Steel - Ambridge | Ambridge | PA | — | ◇ UNVERIFIED |
| VVValley / Vulcan Mold CO | Trenton | MI | — | ◇ UNVERIFIED |
| VIVaricast INC | Vancouver | WA | — | ◇ UNVERIFIED |
| VIVermilion Iron Works | Hoopeston | IL | — | ◇ UNVERIFIED |
| VCVermont Castings | Randolph | VT | — | ◇ UNVERIFIED |
| VCVictaulic CO Amer/allentown Facility | Allentown | PA | — | ◇ UNVERIFIED |
| VCVictaulic Co/lawrenceville Plt | Tioga | PA | — | ◇ UNVERIFIED |
| VPViking Pump Inc-alloys Foundry | Cedar Falls | IA | — | ◇ UNVERIFIED |
| VMVilter Manufacturing Corporation - Milwaukee | Milwaukee | WI | — | ◇ UNVERIFIED |
| VMVirginia Metalcrafters INC | Waynesboro | VA | — | ◇ UNVERIFIED |
| WMWa317943601 - Mackenzie Castings LLC | Arlington | WA | — | ◇ UNVERIFIED |
| WDWa317945207 - D&l Foundry INC | Moses Lake | WA | — | ◇ UNVERIFIED |
| WMWalker Machine and Foundry | Roanoke | VA | — | ◇ UNVERIFIED |
| WMWard Manufacturing, LLC | Blossburg | PA | — | ◇ UNVERIFIED |
| WFWaterman Foundry | Exeter | CA | — | ◇ UNVERIFIED |
| WFWatsontown Foundry | Watsontown | PA | — | ◇ UNVERIFIED |
| WAWaunakee Alloy Casting Corporation | Waunakee | WI | — | ◇ UNVERIFIED |
 Waupaca Foundry | Tell City | IN | — | ◇ UNVERIFIED |
| Waupaca Foundry INC. | Tioga | PA | — | ◇ UNVERIFIED |
| Waupaca Foundry INC Warehouse | Waupaca | WI | — | ◇ UNVERIFIED |
| Waupaca Foundry Landfill | Waupaca | WI | — | ◇ UNVERIFIED |
| WWelaco | Bakersfield | CA | — | ◇ UNVERIFIED |
| WCWesgo Ceramics | Belmont | CA | — | ◇ UNVERIFIED |
| WCWestern Castings Company | Santa Clara | CA | — | ◇ UNVERIFIED |
| WMWestern Metals Recycling, LLC | Pueblo | CO | — | ◇ UNVERIFIED |
