Washington - Area of significance: Architecture
| South Bend Carnegie Public Library |
| South Capitol Neighborhood Historic District |
| Southern Columbia Plateau and Okanogan Highlands Site No. 45DO1244 |
| South Hill Historic District |
| South J Street Historic District |
| South Puyallup River Bridge |
| South Side Historic District |
| Spokane City Hall Building |
| Spokane Club Building-Legion Building |
| Spokane County Courthouse |
| Spokane Flour Mill |
| Spokane & Inland Empire Railroad Car Facility |
| Spokane Public Library |
| Spokane Public Library |
| Spokane Public Library |
| Spokane Public Library |
| Spokane Sash and Door Company Flats |
| Sprague Building |
| Springfield Farm |
| Stadium-Seminary Historic District |
| St. Andrews Creek Bridge |
| St. Andrew's Episcopal Church |
| St. Andrews Episcopal Church |
| St. Andrews Patrol Cabin |
| St. Anne's Roman Catholic Church |
| Stanwood IOOF Public Hall |
| Starrett House |
| St. Boniface Church, Convent and Rectory |
| Steele, Alden Hatch, House |
| Steen, Helmer and Selma, House |
| Stegerwald, Andrew, House |
| Steilacoom Historic District |
| Steinke, Max, Barn |
| Steliko Ranger Station |
| Stevens Pass Guard Station |
| St. Helens Hotel |
| Stimson-Green House |
| Stoecker, Richard & Lydia |
| Storey, Ellsworth, Cottages Historic District |
| Storey, Ellsworth, Residences |
| Storm King Ranger Station |
| St. Paul's Episcopal Church |
| Stratford School |
| Stuart House and Gardens |
| Sugarloaf Peak Lookout |
| Suiattle Guard Station |
| Sulphide-Frisco Cabin |
| Summerland Trail Shelter |
| Summit School |
| Sunrise Comfort Station |
| Sunrise Historic District |
| Sunset Park Patrol Cabin |
| Sunset Park Trail Shelter |
| Suntop Lookout |
| Sutton Barn |
| Swain, William, House |
| Swalwell Block and Adjoining Commercial Buildings |
| Swalwell Cottage |
| Swamp-Meadow Cabin East |
| Swamp-Meadow Cabin West |
| Sweet, Reuben, House |
| Tacoma Building |
| Tacoma Ice Company's Cold Storage Plant |
| Tacoma Mausoleum |
| Tahoma Vista Comfort Station |
| Teapot Dome Service Station |
| Temple de Hirsch |
| Tennant, J. D., House |
| Tharald Homestead |
| Thomas, Dr. Charles and Elsie, House |
| Thompson, Albert W., Hall |
| Thompson, Will H., House |
| Thornewood |
| Thorp Grade School |
| Thorton, William Harper, House |
| Three Fingers Lookout |
| Three Forks Shelter |
| Three Lakes Patrol Cabin |
| Thronson, J. A., House |
| Thurston County Courthouse |
| Times Building |
| Tipsoo Lake Comfort Station |
| Tracy House |
| Trafton School |
| Triangle Hotel and Bar |
| Trinity Parish Church |
| Trommald Building |
| Trout Lake Tourist Club |
| Trumbull, John, House |
| Tucker, Horace, House |
| Tuell, Frank and Maude, House |
| Tukwila School |
| Tumwater Historic District |
| Tumwater Methodist Church |
| Turner-Koepf House |
| Turner, Luther P. and Jane Marie, House |
| Twanoh State Park |
| Tyee Mountain Lookout |
| Tyni Building |
| Union Depot-Warehouse Historic District |
Data from United States Park Service and Wikidata
