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- WT Holdings, LLCEphrata
- WW Partners, L.L.C.Bellingham
- WWX LIMITED LLCBELLEVUE
- WYCKOFF FARMS, INCORPORATEDYAKIMA
- Wyndhaven Mesa Partners L.L.C.Vancouver
- WZSO Properties, LLCVancouver
- X2 Broadway, LLCTacoma
- X Marks the Spot LLCSeattle
- YACHT HARBOR LLCVancouver
- YAK FREEWAY, LLCBellingham
- YAKIMA CHIEF HOPS, INC.YAKIMA
- Yakima Federal Savings and Loan AssociationYakima
- Yauger Park 4th Avenue Associates, LLCTacoma
- Yelm Medical Office Building, LLCTumwater
- YJ America, Inc.Seattle
- Y.L. Foundation, LLCBellevue
- YL Properties, Inc.Seattle
- YOUNG MEN'S CHRISTIAN ASSOCIATION OF PIERCE AND KITSAP COUNTIESTACOMA
- YOUNG MEN'S CHRISTIAN ASSOCIATION OF SNOHOMISH COUNTYEVERETT
- YOUNG OCEAN INC.KENT
- ZILLOW GROUP, INC.SPOKANE
- ZILLOW, INC.SPOKANE
- Zulmar LLCSeaTac
- Zumiez Inc.Lynnwood