Washington - Criteria: C (architecture/engineering)
| Rothschild House |
| Rover, Hanna, House |
| Rucker House |
| Rust, William Ross, House |
| Sacajawea State Park |
| Saint Edward Seminary |
| Salvation Army Building |
| Sanders, Erick Gustave, Mansion |
| SAND MAN (Tug Boat) |
| San Juan Island, Lime Kiln Light Station |
| San Marco |
| Schade Brewery |
| Schafer State Park |
| Schmitz Park Bridge |
| Seattle Art Museum |
| Seattle, Chief of the Suquamish, Statue |
| Seattle Chinatown Historic District |
| Seattle Electric Company Georgetown Steam Plant |
| Seattle Municipal Light and Power Plant |
| Seattle Public Library |
| Seattle Public Library |
| Seattle Public Library |
| Seattle Public Library |
| Seattle Public Library |
| Seivers Brothers Ranchhouse and Barn |
| Seventh Street Theater |
| Shafer Building |
| Silver Creek Ranger Station |
| Singer's Lake Crescent Tavern |
| Skagit River and Newhalem Creek Hydroelectric Projects |
| Skinner Building |
| Slocum House |
| Snake River Bridge |
| Snohomish County Courthouse |
| Snoqualmie Depot |
| Snoqualmie Falls Cavity Generating Station |
| Snoqualmie Falls Hydroelectric Power Plant Historic District |
| Sorenson House |
| Sourdough Mountain Lookout |
| South Hill Historic District |
| South Puyallup River Bridge |
| Spokane City Hall Building |
| Spokane Club Building-Legion Building |
| Spokane County Courthouse |
| Spokane Flour Mill |
| Spokane, Portland and Seattle Railway Company Bridge 291.4-O.W.R.&N. Crossing-Washtucna |
| Spokane Public Library |
| Spokane Public Library |
| Spokane Public Library |
| Spokane Public Library |
| Spokane River Bridge at Fort Spokane |
| Spokane River Bridge at Long Lake Dam |
| 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 |
| St. Boniface Church, Convent and Rectory |
| Steilacoom Historic District |
| Stevens Pass Historic District |
| St. Helens Hotel |
| Storm King Ranger Station |
| St. Paul's Episcopal Church |
| Sugarloaf Peak Lookout |
| Sulphide-Frisco Cabin |
| Summerland Trail Shelter |
| Summit School |
| Sunrise Comfort Station |
| Sunrise Historic District |
| Sunset Park Patrol Cabin |
| Sunset Park Trail Shelter |
| Suntop Lookout |
| Swain, William, House |
| Swalwell Cottage |
| Swamp-Meadow Cabin East |
| Swamp-Meadow Cabin West |
| Sweet, Reuben, House |
| Tacoma Building |
| Tacoma Mausoleum |
| Tahoma Vista Comfort Station |
| Teapot Dome Service Station |
| Temple de Hirsch |
| The Sentinel |
| Thornewood |
| Thorp Grade School |
| Three Fingers Lookout |
| Three Forks Shelter |
| Three Lakes Patrol Cabin |
| Thurston County Courthouse |
| Times Building |
| Tipsoo Lake Comfort Station |
| Tracy House |
| Trafton School |
| Trinity Parish Church |
| Trommald Building |
| Trout Lake Tourist Club |
| Tumwater Historic District |
| Tumwater Methodist Church |
Data from United States Park Service and Wikidata
