| SSSol-pro/lilyblad Site | Tacoma | WA | Wood Product Manufacturing321999 | — | ◇ UNVERIFIED |
| SGSouth Grays Harbor Timber Reso | Shelton | WA | Wood Product Manufacturing321992 | — | ◇ UNVERIFIED |
| SPSouth Park Marina | Seattle | WA | Transportation Equipment Manufacturing336612 | — | ◇ UNVERIFIED |
| SMSpecialty Minerals INC Wallula | Wallula | WA | Chemical Manufacturing325188 | — | ◇ UNVERIFIED |
| SPSpecialty Plating CO | Mount Vernon | WA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| SLSpectra Lux CORP 134th Ct Ne | Redmond | WA | Computer and Electronic Product Manufacturing334511 | — | ◇ UNVERIFIED |
| SCSpokane Custom Wood Treating | Spokane | WA | Wood Product Manufacturing321114 | — | ◇ UNVERIFIED |
| SMSpokane Metal Finishing | Spokane | WA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| STSpokane Teachers Credit Union | Liberty Lake | WA | Computer and Electronic Product Manufacturing334515 | — | ◇ UNVERIFIED |
| SSpringstar | Woodinville | WA | Chemical Manufacturing325320 | — | ◇ UNVERIFIED |
| SISpur Industries INC | Spokane | WA | Fabricated Metal Product Manufacturing332811 | — | ◇ UNVERIFIED |
| SCSsa Containers INC | Tacoma | WA | Paper Manufacturing322222 | — | ◇ UNVERIFIED |
| SEStarrow Enterprises INC | Auburn | WA | Plastics and Rubber Products Manufacturing326191 | — | ◇ UNVERIFIED |
| SPSteel Painters INC Columbia Way | Vancouver | WA | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| SMSte Michelle Wine Estate Snoqualmie | Prosser | WA | Beverage and Tobacco Product Manufacturing312130 | — | ◇ UNVERIFIED |
| SGStemilt Growers Miller Street Facility | Wenatchee | WA | Nonmetallic Mineral Product Manufacturing327999 | — | ◇ UNVERIFIED |
| SIStoddard International | Arlington | WA | Transportation Equipment Manufacturing336413 | — | ◇ UNVERIFIED |
| SCStoneway Concrete Houser Way | Renton | WA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| SWStowe Woodward CO | Kelso | WA | Plastics and Rubber Products Manufacturing326291 | — | ◇ UNVERIFIED |
| SBSuldans Boat Works | Port Orchard | WA | Transportation Equipment Manufacturing336612 | — | ◇ UNVERIFIED |
| SSSummit Supply | Seattle | WA | Chemical Manufacturing325110 | — | ◇ UNVERIFIED |
| SWSummit Window and Patio Door Spokane | Spokane | WA | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| SFSunrise Fiberglass Engineering Site | Shelton | WA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| SCSuntron CORP | Moses Lake | WA | Computer and Electronic Product Manufacturing334418 | — | ◇ UNVERIFIED |
| SSSuper Surface Techna | Mukilteo | WA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| SFSurftech Finishes CO INC | Kent | WA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| SHSw Harbor Project | Seattle | WA | Wood Product Manufacturing321114 | — | ◇ UNVERIFIED |
| TFTacoma Fixture Company | Tacoma | WA | Wood Product Manufacturing321911 | — | ◇ UNVERIFIED |
| TPTacoma Public Utilities Lagrande Dam | La Grande | WA | Food Manufacturing311313 | — | ◇ UNVERIFIED |
| TCTalisman Construction Services | Spokane | WA | Chemical Manufacturing325000 | — | ◇ UNVERIFIED |
| TLTallygenicom LP | Kent | WA | Computer and Electronic Product Manufacturing334000 | — | ◇ UNVERIFIED |
| TSTc Systems INC | Everett | WA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| TCTecnal Corporation Site | Anacortes | WA | Chemical Manufacturing325100 | — | ◇ UNVERIFIED |
| TITelect INC Liberty Lake | Liberty Lake | WA | Computer and Electronic Product Manufacturing334000 | — | ◇ UNVERIFIED |
| TWTerex Washington INC 76th Street | Redmond | WA | Machinery Manufacturing333923 | — | ◇ UNVERIFIED |
| TBTern Boats | Kent | WA | Transportation Equipment Manufacturing336612 | — | ◇ UNVERIFIED |
| TETex Enterprises INC | Auburn | WA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| TFThc Farms | Tacoma | WA | Wood Product Manufacturing321999 | — | ◇ UNVERIFIED |
| TBThe Boeing CO 24th Pl W | Everett | WA | Transportation Equipment Manufacturing336413 | — | ◇ UNVERIFIED |
| TCThe Center | Colville | WA | Machinery Manufacturing333414 | — | ◇ UNVERIFIED |
| TFThe Foundry INC | Mead | WA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| TSThermal Supply | Fife | WA | Furniture and Related Product Manufacturing337127 | — | ◇ UNVERIFIED |
| TCThermedia CORP Shelton | Shelton | WA | Miscellaneous Manufacturing339113 | — | ◇ UNVERIFIED |
| TFThermo Fluids INC | Sumner | WA | Food Manufacturing311313 | — | ◇ UNVERIFIED |
| TSThe Shipyard LLC | Hoquiam | WA | Transportation Equipment Manufacturing336611 | — | ◇ UNVERIFIED |
| TTThe Timken CORP Ferndale | Ferndale | WA | Fabricated Metal Product Manufacturing332991 | — | ◇ UNVERIFIED |
| TJThunder Jet Boats | Clarkston | WA | Transportation Equipment Manufacturing336612 | — | ◇ UNVERIFIED |
| TWTitus Will Enterprises INC | Tacoma | WA | Transportation Equipment Manufacturing336399 | — | ◇ UNVERIFIED |
| THTk Holdings INC | Moses Lake | WA | Textile Product Mills314999 | — | ◇ UNVERIFIED |
| TATollycraft Acquisition Corporation | Kelso | WA | Transportation Equipment Manufacturing336612 | — | ◇ UNVERIFIED |
