Washington - Role: Building
| Shogren Cottage |
| Shoudy House |
| Showboat Theatre |
| Shriner Peak Fire Lookout |
| Shuey, Henry Owen, House |
| Sigma Kappa Mu Chapter House |
| Silver Creek Ranger Station |
| Si View Park |
| Skagit City School |
| Skansie, Andrew & Bertha, Net Shed and House |
| Skinner Building |
| Slagle, Jesse W. & Elizabeth, House |
| Slavonian Hall |
| Slip Point Light Station |
| Slocum House |
| Small-Elliott House |
| Smith, Edwin A., House |
| Smith Hospital and Douglas County Press Building |
| Smith, Nat, House |
| Smith, Peter, Farm-Donation Land Claim |
| Snohomish County Courthouse |
| Snoqualmie Depot |
| Snoqualmie School Campus |
| Solby, William and Margaret, House |
| Sole, Tollef, House |
| Sorenson House |
| Sourdough Mountain Lookout |
| South Bend Carnegie Public Library |
| Spokane City Hall Building |
| Spokane Club Building-Legion Building |
| Spokane County Courthouse |
| Spokane Fire Station No. 3 |
| 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 |
| St. Andrew's Episcopal Church |
| St. Andrews Episcopal Church |
| St. Andrews Patrol Cabin |
| Stanger, John, House |
| St. Anne's Roman Catholic Church |
| Stanwood IOOF Public Hall |
| Starrett House |
| State Training School for Girls Administration Building |
| St. Boniface Church, Convent and Rectory |
| Steele, Alden Hatch, House |
| Steen, Helmer and Selma, House |
| Stegerwald, Andrew, House |
| Stehekin School |
| Steilacoom Catholic Church |
| Steinke, Max, Barn |
| Steliko Ranger Station |
| Stella Blacksmith Shop |
| Stevens Hall |
| Stevens Pass Guard Station |
| St. Helens Hotel |
| Stimson-Green House |
| St. Joseph's Mission |
| Stoecker, Richard & Lydia |
| Storey, Ellsworth, Residences |
| Storm King Ranger Station |
| St. Paul's Episcopal Church |
| St. Paul's Mission |
| St. Peter's Episcopal Church |
| Stratford School |
| Stuart House and Gardens |
| Sugarloaf Peak Lookout |
| Suiattle Guard Station |
| Summerland Trail Shelter |
| Summit School |
| Sunrise Comfort Station |
| Sunset Park Patrol Cabin |
| Sunset Park Trail Shelter |
| Sunset Telephone & Telegraph Building |
| Supply Laundry Building |
| Sutton Barn |
| Swain, William, House |
| 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 |
| Tahoma Vista Comfort Station |
| Tatoosh Island |
| Teapot Dome Service Station |
| Temple de Hirsch |
| Tenino Depot |
| Tennant, J. D., House |
| Thomas, Dr. Charles and Elsie, House |
| Thompson, Albert W., Hall |
| Thompson, Will H., House |
| Thornewood |
Data from United States Park Service and Wikidata
