| TITopsoils INC 19003 | Snohomish | WA | Nonmetallic Mineral Product Manufacturing327999 | — | ◇ UNVERIFIED |
| TTTotal Truck Shop | Spokane | WA | Transportation Equipment Manufacturing336212 | — | ◇ UNVERIFIED |
| TTTree Top Prosser Plant | Prosser | WA | Food Manufacturing311411 | — | ◇ UNVERIFIED |
| TTTree Top Ross Plant | Selah | WA | Food Manufacturing311421 | — | ◇ UNVERIFIED |
| TITreoil Industries | Ferndale | WA | Petroleum and Coal Products Manufacturing324191 | — | ◇ UNVERIFIED |
| TATrident Agricultural Products INC Buena | Buena | WA | Chemical Manufacturing325320 | — | ◇ UNVERIFIED |
| TSTrim Systems Site | Seattle | WA | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| TPTri Pak 3 | Tacoma | WA | Food Manufacturing311000 | — | ◇ UNVERIFIED |
| TITripak INC | Puyallup | WA | Wood Product Manufacturing321211 | — | ◇ UNVERIFIED |
| TATriton Aerospace | Burlington | WA | Computer and Electronic Product Manufacturing334412 | — | ◇ UNVERIFIED |
| TCTriumph Composite Systems INC | Spokane | WA | Transportation Equipment Manufacturing336413 | — | ◇ UNVERIFIED |
| TWTri Way Industries INC 44th St Nw | Auburn | WA | Furniture and Related Product Manufacturing337127 | — | ◇ UNVERIFIED |
| TATruck Accessories Group INC Pace Edwards | Centralia | WA | Transportation Equipment Manufacturing336211 | — | ◇ UNVERIFIED |
| TNTrue North Apartment Building | Seattle | WA | Computer and Electronic Product Manufacturing334511 | — | ◇ UNVERIFIED |
 Ttm Technologies Redmond Site | Redmond | WA | Computer and Electronic Product Manufacturing334412 | — | ◇ UNVERIFIED |
| TATube Art Signs and Sports | Yakima | WA | Miscellaneous Manufacturing339950 | — | ◇ UNVERIFIED |
| TATucci and Sons INC | Tacoma | WA | Printing and Related Support Activities323112 | — | ◇ UNVERIFIED |
| TTTulalip Test Site | Tulalip | WA | Transportation Equipment Manufacturing336411 | — | ◇ UNVERIFIED |
| TCTwin City Foods Ellensburg | Ellensburg | WA | Food Manufacturing311411 | — | ◇ UNVERIFIED |
| TCTwin City Foods INC Pasco | Pasco | WA | Food Manufacturing311411 | — | ◇ UNVERIFIED |
| TCTwin City Foods Kennewick | Kennewick | WA | Food Manufacturing311411 | — | ◇ UNVERIFIED |
 Tyee Aircraft Mckechnie Group | Everett | WA | Transportation Equipment Manufacturing336413 | — | ◇ UNVERIFIED |
| UCUnion Carbide Linde Div | Spokane | WA | Chemical Manufacturing325188 | — | ◇ UNVERIFIED |
| UIUnisea INC Redmond | Redmond | WA | Food Manufacturing311710 | — | ◇ UNVERIFIED |
| UCUnited Coatings Manufacturing CO | Greenacres | WA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| UMUniversal Mfg CORP | Woodinville | WA | Fabricated Metal Product Manufacturing332322 | — | ◇ UNVERIFIED |
 Universal Printing | Seattle | WA | Printing and Related Support Activities323112 | — | ◇ UNVERIFIED |
| UAUS Army Wsmc Pier 23 | Tacoma | WA | Transportation Equipment Manufacturing336611 | — | ◇ UNVERIFIED |
| UDUS Doi Ft Simcoe Job CORP Ctr | White Swan | WA | Transportation Equipment Manufacturing336211 | — | ◇ UNVERIFIED |
| UMUS Marine Bayliner Marine | Arlington | WA | Transportation Equipment Manufacturing336612 | — | ◇ UNVERIFIED |
| VBVaagen Bros Lumber CO Republic Division | Republic | WA | Wood Product Manufacturing321212 | — | ◇ UNVERIFIED |
| VMValley Manufactured Housing | Sunnyside | WA | Wood Product Manufacturing321992 | — | ◇ UNVERIFIED |
| VPValley Processing 2 | Sunnyside | WA | Food Manufacturing311411 | — | ◇ UNVERIFIED |
| VRValley Ready Mix | Sunnyside | WA | Food Manufacturing311421 | — | ◇ UNVERIFIED |
| VPVancouver Port Lower River | Vancouver | WA | Primary Metal Manufacturing331312 | — | ◇ UNVERIFIED |
| VIVaricast INC | Vancouver | WA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| VSVashon Sand and Gravel INC | Vashon | WA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| VUVesuvius USA Site | Chehalis | WA | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| VMViox Mcdowell Site | Seattle | WA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| VOVspone Optical Technology Centers Lacey | Lacey | WA | Miscellaneous Manufacturing339115 | — | ◇ UNVERIFIED |
| WAWa317942353 - a & I Manufacturing INC | Monroe | WA | Furniture and Related Product Manufacturing337920 | 20-99 | ◇ UNVERIFIED |
| WEWa317944418 - Enclume Designs LLC | Port Hadlock | WA | Fabricated Metal Product Manufacturing332214 | 20-99 | ◇ UNVERIFIED |
| WCWa317945138 - Cvm Machine INC | Chehalis | WA | Fabricated Metal Product Manufacturing332710 | 1-19 | ◇ UNVERIFIED |
| WPWa317949902 - Precision Fabricators LLC | Seattle | WA | Fabricated Metal Product Manufacturing332322 | 1-19 | ◇ UNVERIFIED |
| WIWagstaff INC | Spokane | WA | Primary Metal Manufacturing331313 | — | ◇ UNVERIFIED |
| WWWalla Walla Foundry | Walla Walla | WA | Primary Metal Manufacturing331529 | — | ◇ UNVERIFIED |
| WMWal Mart Store 2016 | Colville | WA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| WMWal Mart Supercenter 2006 | Clarkston | WA | Fabricated Metal Product Manufacturing332116 | — | ◇ UNVERIFIED |
| WTWalsh Trucking CO LTD Morton | Morton | WA | Wood Product Manufacturing321113 | — | ◇ UNVERIFIED |
| WHWan Hua Foods INC | Seattle | WA | Food Manufacturing311422 | 1-19 | ◇ UNVERIFIED |
