| Washington Public Power Support Systems | Richland | WA |
| Washington Public Power Support Systems | Centralia | WA |
| Washington Public Service | Olympia | WA |
| Washington Pulp & Paper | Port Angeles | WA |
| Washington Savings Bank | Seattle | WA |
| Washington Soldiers Home | Orting | WA |
| Washington Standard | Seattle | WA |
| Washington State Bank Building | Washougal | WA |
| Washington State Capitol | Olympia | WA |
| Washington State Patrol Supply Building | Olympia | WA |
| Washington State Penitentiary | Walla Walla | WA |
| Washington State Reformatory | Monroe | WA |
| Washington State Training School | Chehalis | WA |
| Washington State University | Pullman | WA |
| Washington Veneer | Olympia | WA |
| Washington Water Power | Spokane | WA |
| Washougal Branch | Washougal | WA |
| Washougal Woolen Mills | Washougal | WA |
| Weber Chevrolet | Yakima | WA |
| Weidauer & Lansdown | Everett | WA |
| Welch Grape Juice | Kennewick | WA |
| Wells & Wade Fruit | Wenatchee | WA |
| Wenatchee Daily World | Wenatchee | WA |
| Wenatchee High School | Wenatchee | WA |
| Wenatchee Steam Laundry | Wenatchee | WA |
| Wesley Terrace Retiement Home | Des Moines | WA |
| Western Pneumatic Tube | Kirkland | WA |
| Western State Hospital | Tacoma | WA |
| Western Washington Hospital for the Insane | Steilacoom | WA |
| Western Washington State College | Bellingham | WA |
| Western Washington University | Bellingham | WA |
| Westinghouse Electric & Manufacturing | Hanford | WA |
| West Tacoma Mill | Steilacoom | WA |
| Weyerhaeuser | Federal Way | WA |
| Weyerhaeuser | Snoqualmie Falls | WA |
| Weyerhaeuser | Tacoma | WA |
| Weyerhaeuser | Centralia | WA |
| Weyerhaeuser | Everett | WA |
| Weyerhaeuser | Cosmopolis | WA |
| Weyerhaeuser | Longview | WA |
| Weyerhaeuser | Enumclaw | WA |
| Weyerhaeuser | Seattle | WA |
| Whatcom Falls Milling | Bellingham | WA |
| Whatcom Middle School | Bellingham | WA |
| Wheeler Osgood | Tacoma | WA |
| Wheeler Osgood | Seattle | WA |
| Whidbey Island Naval Air Station | Oak Harbor | WA |
| White Plains Hospital | Vancouver | WA |
| White Swan Lumber | White Swan | WA |
| Whittier Elementary School | Fircrest | WA |
