| RRResource Recovery Group | Grandview | WA | Food Manufacturing311111 | — | ◇ UNVERIFIED |
| RPRestoration Plating | Spokane | WA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| RTRiverside Topsoil | Snohomish | WA | Chemical Manufacturing325314 | — | ◇ UNVERIFIED |
| RCRoadway Construction | Tacoma | WA | Petroleum and Coal Products Manufacturing324191 | — | ◇ UNVERIFIED |
| RERoadway Express INC Puyallup | Tacoma | WA | Printing and Related Support Activities323112 | — | ◇ UNVERIFIED |
| RHRoche Harbor Marine | Friday Harbor | WA | Transportation Equipment Manufacturing336612 | — | ◇ UNVERIFIED |
| RMRocky Mountain Bank Note CO Spokane | Liberty Lake | WA | Electrical Equipment, Appliance & Component Manufacturing335312 | — | ◇ UNVERIFIED |
| RCRose City Printing and Packaging | Vancouver | WA | Paper Manufacturing322212 | — | ◇ UNVERIFIED |
| RIRoza Irrigation District | Sunnyside | WA | Electrical Equipment, Appliance & Component Manufacturing335931 | — | ◇ UNVERIFIED |
| RPRrd Packaging Solutions | Kent | WA | Paper Manufacturing322212 | — | ◇ UNVERIFIED |
| RMRsa Microtech Westar Lane | Burlington | WA | Chemical Manufacturing325314 | — | ◇ UNVERIFIED |
| RTR T London Company | Olympia | WA | Paper Manufacturing322211 | — | ◇ UNVERIFIED |
| RPRudd Paint and Varnish Site | Seattle | WA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| SSSafeway Spokane Truck Stop | Spokane | WA | Food Manufacturing311520 | — | ◇ UNVERIFIED |
| SGSaint Gobain Crystals and Detectors | Washougal | WA | Computer and Electronic Product Manufacturing334413 | — | ◇ UNVERIFIED |
| SBSalmon Bay Steel Company | Kent | WA | Primary Metal Manufacturing331111 | — | ◇ UNVERIFIED |
| SISanderson Industrial Park | Shelton | WA | Machinery Manufacturing333999 | — | ◇ UNVERIFIED |
| SAS and S Engine Remanufacturing | Spokane | WA | Machinery Manufacturing333618 | — | ◇ UNVERIFIED |
| SBScarsella Bros Cascade Quarry | Gold Bar | WA | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ UNVERIFIED |
| SSSchneider Simpson Sheet Metal | Tacoma | WA | Fabricated Metal Product Manufacturing332322 | — | ◇ UNVERIFIED |
| SESchweitzer Engineering Laboratories | Pullman | WA | Electrical Equipment, Appliance & Component Manufacturing335314 | — | ◇ UNVERIFIED |
| SCSchwerin Concaves Walla Walla Site | Walla Walla | WA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| SSSeasoft Scuba | Lacey | WA | Miscellaneous Manufacturing339920 | — | ◇ UNVERIFIED |
| SBSeattle Bulk Shipping LLC | Seattle | WA | Food Manufacturing311211 | — | ◇ UNVERIFIED |
| SCSeattle Childrens Hospital Research Inst | Seattle | WA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| SCSeattle Collision Center | Seattle | WA | Furniture and Related Product Manufacturing337920 | — | ◇ UNVERIFIED |
| SGSeattle Genetics INC | Bothell | WA | Chemical Manufacturing325414 | — | ◇ UNVERIFIED |
| SPSeattle Port Fishermans Terminal | Seattle | WA | Transportation Equipment Manufacturing336612 | — | ◇ UNVERIFIED |
| SESeaview East Boatyard | Seattle | WA | Transportation Equipment Manufacturing336611 | — | ◇ UNVERIFIED |
| SISecon, Inc./stansteel 3000 | Bellevue | WA | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| SFSelect Farms LTD Paint Booth | Spokane | WA | Wood Product Manufacturing321999 | — | ◇ UNVERIFIED |
| SFSeneca Foods CORP Dayton | Dayton | WA | Food Manufacturing311421 | — | ◇ UNVERIFIED |
| SSService Steel Aerospace 4609 | Fife | WA | Wood Product Manufacturing321992 | — | ◇ UNVERIFIED |
| SSSeven Seas Fishing CO | Seattle | WA | Transportation Equipment Manufacturing336612 | — | ◇ UNVERIFIED |
| SLSharp Laboratories of America | Camas | WA | Printing and Related Support Activities323115 | — | ◇ UNVERIFIED |
| SUShonan USA INC | Grandview | WA | Food Manufacturing311411 | — | ◇ UNVERIFIED |
| SUSiemens Ultrasound | Issaquah | WA | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| SSSierra Sandblasting LLC | Tacoma | WA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| SCSilgan Container CORP Vancouver | Vancouver | WA | Fabricated Metal Product Manufacturing332431 | — | ◇ UNVERIFIED |
| SCSilgan Containers | Toppenish | WA | Fabricated Metal Product Manufacturing332431 | — | ◇ UNVERIFIED |
| SSSimplot Soilbuilders Prosser | Prosser | WA | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| STSimpson Timber CO Commencement Bay Opr | Tacoma | WA | Wood Product Manufacturing321113 | — | ◇ UNVERIFIED |
| STSimpson Timber CO St Yd Sawmill 5 | Shelton | WA | Wood Product Manufacturing321113 | — | ◇ UNVERIFIED |
| SSSinclair Systems Intl LLC | Wenatchee | WA | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| SISkills INC Paint | Seattle | WA | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| SMSkyline Mail Carriers | Tacoma | WA | Plastics and Rubber Products Manufacturing326191 | — | ◇ UNVERIFIED |
| SCSmith Chrome Plating | Walla Walla | WA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| STSmk Tri Cities INC | Pasco | WA | Fabricated Metal Product Manufacturing332312 | 20-99 | ◇ UNVERIFIED |
| SCSnohomish County Building | Everett | WA | Electrical Equipment, Appliance & Component Manufacturing335314 | — | ◇ UNVERIFIED |
| SISnyder Industries INC | Seattle | WA | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
