| WCWashington Crab Bottomfish and Fishmeal | Westport | WA | Food Manufacturing311710 | — | ◇ UNVERIFIED |
| WFWashington Federal Savings and Loan | Bellingham | WA | Transportation Equipment Manufacturing336612 | — | ◇ UNVERIFIED |
| WTWashington Trucking INC Marysville | Marysville | WA | Nonmetallic Mineral Product Manufacturing327999 | — | ◇ UNVERIFIED |
| WUWashington United Terminals | Tacoma | WA | Chemical Manufacturing325320 | — | ◇ UNVERIFIED |
| WAWatson Asphalt Paving CO INC | Redmond | WA | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| WAWatson Asphalt Paving CO INC | Kanaskat | WA | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| WWWa Wsu Long Beach Research and Ext Unit | Long Beach | WA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| WCWeiss Cascade | Centralia | WA | Wood Product Manufacturing321114 | — | ◇ UNVERIFIED |
| WWWellons Water Technology | Vancouver | WA | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| WGWescor Graphics CORP | Seattle | WA | Printing and Related Support Activities323120 | — | ◇ UNVERIFIED |
| WCWesmar Company INC | Seattle | WA | Chemical Manufacturing325612 | — | ◇ UNVERIFIED |
| WNWestak North Site | Redmond | WA | Computer and Electronic Product Manufacturing334412 | — | ◇ UNVERIFIED |
| WBWest Bay Marina | Olympia | WA | Transportation Equipment Manufacturing336612 | — | ◇ UNVERIFIED |
| WCWest Coast Marine Cleaning | Vancouver | WA | Transportation Equipment Manufacturing336611 | — | ◇ UNVERIFIED |
| WAWestech Aerosol Corporation | Port Orchard | WA | Chemical Manufacturing325520 | — | ◇ UNVERIFIED |
| WCWestern Cabinet and Millwork INC | Woodinville | WA | Machinery Manufacturing333298 | — | ◇ UNVERIFIED |
| WCWestern Chemical | Ferndale | WA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| WCWestern Coating INC | Auburn | WA | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| WPWestern Pacific Lumber | Ferndale | WA | Wood Product Manufacturing321912 | — | ◇ UNVERIFIED |
| WPWestern Polymer Menan Division | Moses Lake | WA | Food Manufacturing311111 | — | ◇ UNVERIFIED |
| WRWestern Recreational Vehicles | Yakima | WA | Transportation Equipment Manufacturing336213 | — | ◇ UNVERIFIED |
| WSWestern Steel Casting CO | Seattle | WA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| WTWestern Tile and Marble | Redmond | WA | Machinery Manufacturing333923 | — | ◇ UNVERIFIED |
| WIWestport Interior Plant | Port Angeles | WA | Transportation Equipment Manufacturing336612 | — | ◇ UNVERIFIED |
| WFWestway Feed Products CO INC | Seattle | WA | Food Manufacturing311119 | — | ◇ UNVERIFIED |
| WEWeyerhaeuser Enumclaw Millpond | Enumclaw | WA | Wood Product Manufacturing321113 | — | ◇ UNVERIFIED |
| WEWeyerhaeuser Everett West Site | Everett | WA | Wood Product Manufacturing321113 | — | ◇ UNVERIFIED |
| WLWeyerhaeuser Longview Lumber Mill | Longview | WA | Wood Product Manufacturing321113 | — | ◇ UNVERIFIED |
| WPWeyerhaeuser Paper CO Union Gap | Union Gap | WA | Paper Manufacturing322211 | — | ◇ UNVERIFIED |
| WSWeyerhaeuser Sawmill Aberdeen | Aberdeen | WA | Wood Product Manufacturing321113 | — | ◇ UNVERIFIED |
| WSWeyerhaeuser Snoqualimie Mill Site | Snoqualmie | WA | Wood Product Manufacturing321113 | — | ◇ UNVERIFIED |
| WTWeyerhaeuser Technology Center | Federal Way | WA | Primary Metal Manufacturing331316 | — | ◇ UNVERIFIED |
| WBWhatcom Builders INC | Bellingham | WA | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| WRWheeler Rock Products | Wapato | WA | Nonmetallic Mineral Product Manufacturing327999 | — | ◇ UNVERIFIED |
| WEWilbur Ellis CO Pomeroy | Pomeroy | WA | Chemical Manufacturing325311 | — | ◇ UNVERIFIED |
| WEWilbur Ellis CO Pullman | Pullman | WA | Chemical Manufacturing325312 | — | ◇ UNVERIFIED |
| WIWko INC | Carson | WA | Wood Product Manufacturing321113 | — | ◇ UNVERIFIED |
| WCWood Care Systems | Kirkland | WA | Chemical Manufacturing325180 | — | ◇ UNVERIFIED |
| WAWoodworth and Company INC | Lakewood | WA | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| YMYachtfish Marine | Port Orchard | WA | Transportation Equipment Manufacturing336611 | — | ◇ UNVERIFIED |
| YMYachtfish Marine | Seattle | WA | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| YPYacht Performance Center | Seattle | WA | Transportation Equipment Manufacturing336612 | — | ◇ UNVERIFIED |
| YBYakama Business and Tech Center | White Swan | WA | Wood Product Manufacturing321219 | — | ◇ UNVERIFIED |
| YEYamato Engine Specialists Bakerview Rd | Bellingham | WA | Transportation Equipment Manufacturing336310 | — | ◇ UNVERIFIED |
| YOYe Olde Paint Box | Longview | WA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| YCYoung CORP Nordick Div | Woodinville | WA | Fabricated Metal Product Manufacturing332999 | — | ◇ UNVERIFIED |
| ZIZumar Industries Site | Tacoma | WA | Computer and Electronic Product Manufacturing334290 | — | ◇ UNVERIFIED |
| 1W1 World Globes & Maps LLC | Seattle | WA | Printing and Related Support Activities323113 | 1-19 | ◇ UNVERIFIED |
| ARAccurate Remanufacturing Corpo | Orting | WA | Wood Product Manufacturing321912 | 1-19 | ◇ UNVERIFIED |
| ALAce Lineup Athletics LLC | Vancouver | WA | Printing and Related Support Activities323113 | 1-19 | ◇ UNVERIFIED |
