Idaho - Criteria: A (event)
| Schick, Henry, Barn |
| Schick-Ostolasa Farmstead |
| Schubert Theatre |
| Sealander, Carl S. and Lizzie, Farmstead |
| Sensenig, Emerson and Lucretia, House |
| Settlement School |
| Shilling Avenue Historic District |
| Shoshone Historic District |
| Silver City Historic District |
| Skattaboe Block |
| Skillern, John, House |
| Snyder Guard Station Historical District |
| Soda Springs City Hall |
| Soncarty, Edward and Ida, Barn |
| South Boise Historic Mining District |
| South Eighth Street Historic District |
| Southern Idaho Timber Protective Association (SITPA) Buildings |
| Sparks, Walter, House |
| Spaulding, Almon W. and Dr. Mary E., Ranch |
| Spencer Rock House |
| Spirit Lake Historic District |
| Spori, Jacob, Building |
| Spud Drive-In Theater |
| St. Andrew's Episcopal Church |
| Standrod Bank |
| Stanley Ranger Station |
| Star Camp |
| Star Theater |
| Sterry Hall |
| St. Gertrude's Convent and Chapel |
| St. John's Church |
| St. John's Episcopal Church |
| St. Joseph's Mission |
| St. Maries 1910 Fire Memorial |
| St. Maries Masonic Temple No. 63 |
| St. Mary's Episcopal Church |
| St. Paul's Episcopal Church |
| Stricker Store and Farm |
| Stucki, J. U., House and Outbuildings |
| Swan Falls Dam and Power Plant |
| Sweet Methodist Episcopal Church |
| Tamblyn, Agnes M., House |
| Teton County Courthouse |
| Thompson, Gaylord, House |
| Tolleth House |
| Tolo Lake |
| Troy Downtown Historic District |
| Troy Hospital |
| Twin Falls Bank and Trust Company Building |
| Twin Falls Canal Company Building |
| Twin Falls City Park Historic District |
| Twin Falls Downtown Historic District |
| Twin Falls Milling and Elevator Company Warehouse |
| Twin Falls Original Townsite Residential Historic District |
| Twin Falls Warehouse Historic District |
| Union Pacific Mainline Depot |
| Union School |
| United Presbyterian Church |
| Upper Brownlee School |
| Upper Twin Lakes School |
| U.S. Inspection Statio-Porthill, Idaho |
| U.S. Post Office |
| US Post Office-Blackfoot Main |
| US Post Office-Bonners Ferry Main |
| US Post Office-Buhl Main |
| US Post Office-Caldwell Main |
| US Post Office-Kellogg Main |
| US Post Office-Nampa Main |
| US Post Office-Orofino Main |
| US Post Office-Payette Main |
| US Post Office-Preston Main |
| US Post Office-St. Anthony Main |
| US Post Office-Wallace Main |
| Ustick School |
| Victor Railroad Depot |
| Villeneuve, Charles and Martha, House |
| Vollmer Building |
| Wallace 1910 Fire Memorial |
| Warren Guard Station, Building 1206 |
| Warwas, Richard and Winnie, House |
| Washington County Courthouse |
| Watlington, Benjamin, House |
| Weippe Prairie |
| Weiser Oregon Short Line Railroad Depot |
| White Bird Grade |
| White Spring Ranch |
| Whitney School |
| Wickahoney Post Office and Stage Station |
| Wiley, Orton H., House |
| Wives of Charles C. Rich Historic District |
| Wood River Center Grange No. 87 |
| Wyatt, W. R. and Louisa E., House |
| Yawwinma Traditional Cultural Property |
| Young, Samuel and Ann, House |
Data from United States Park Service and Wikidata
