Washington - Significance region: Local
| St. Helens Hotel |
| Stoecker, Richard & Lydia |
| Stonehenge Memorial |
| Storey, Ellsworth, Residences |
| Storm King Ranger Station |
| St. Paul's Episcopal Church |
| St. Peter's Episcopal Church |
| Stratford School |
| Stuart House and Gardens |
| Suiattle Guard Station |
| Sulphide-Frisco Cabin |
| Sunset Telephone & Telegraph Building |
| Supply Laundry Building |
| Sutton Barn |
| Swain, William, House |
| Swalwell Block and Adjoining Commercial Buildings |
| Swalwell Cottage |
| Swamp-Meadow Cabin East |
| Swamp-Meadow Cabin West |
| Swanson, Hans, House |
| Sweet, Reuben, House |
| Tacoma Building |
| Tacoma Ice Company's Cold Storage Plant |
| Tacoma Mausoleum |
| Tamanowas Rock |
| Teapot Dome Service Station |
| Tekoa Grain Company Elevator & Flathouse |
| Tenino Depot |
| Tenino Downtown Historic District |
| Tennant, J. D., House |
| Tharald Homestead |
| Thomas, Dr. Charles and Elsie, House |
| Thompson, Will H., House |
| Thorp Grade School |
| Thorton, William Harper, House |
| Thronson, J. A., House |
| Toppenish-Zillah Bridge |
| Trafton School |
| Trinity Parish Church |
| Trommald Building |
| Trout Lake Tourist Club |
| Trumbull, John, House |
| Tse whit zen Village |
| Tucker, Horace, House |
| Tuell, Frank and Maude, House |
| Tugboat Parthia |
| Tukwila School |
| Tumwater Methodist Church |
| Turner-Koepf House |
| Turner, Luther P. and Jane Marie, House |
| Tyni Building |
| Uncas School |
| Underwood, Edward and Isabelle, Farm-Five Oaks Farm |
| Union Cemetery-Pioneer Calvary Cemetery |
| Union Mills Superintendent's House |
| Union Pacific Freight Building |
| Union Stables |
| United Presbyterian Church |
| United Shopping Tower |
| University Heights School |
| University National Bank Building |
| University of Washington Faculty Club |
| Upper Kepple Rockshelters (45SP7) |
| U.S. Courthouse |
| US Immigration Building |
| U.S. Inspection Station-Ferry, Washington |
| U.S. Inspection Station-Laurier, Washington |
| U.S. National Bank Building |
| U.S. Post Office |
| U.S. Post Office |
| U.S. Post Office and Annex |
| U. S. Post Office and Courthouse |
| U.S. Post Office and Courthouse |
| US Post Office-Bremerton Main |
| US Post Office-Camas Main |
| US Post Office-Centralia Main |
| US Post Office-Chehalis Main |
| US Post Office-Colfax Main |
| US Post Office-Colville Main |
| US Post Office, Courthouse, and Custom House |
| US Post Office-Hoquiam Main |
| US Post Office-Kelso Main |
| US Post Office-Lyden Main |
| US Post Office-Montesano Main |
| US Post Office-Okanogan Main |
| US Post Office-Omak Main |
| US Post Office-Prosser Main |
| U.S. Post Office-Pullman |
| US Post Office-Raymond Main |
| US Post Office-Sedro Woolley Main |
| US Post Office-Sunnyside Main |
| US Post Office-Tacoma Downtown Station-Federal Building |
| US Post Office-Toppenish Main |
| US Post Office-Vancouver Main |
| US Post Office-Walla Walla Main |
| Utsalady Ladies Aid Building |
| Vancouver Public Library |
| Vancouver Telephone Building |
| Van Trojen House |
| Vashon Hardware Store |
Data from United States Park Service and Wikidata
