Montana - Criteria: C (architecture/engineering)
| St. Philip's Episcopal Church |
| St. Richard's Church |
| Studebaker Building |
| Sullivan, James J., House |
| Sullivan Rooming House |
| Summers-Quast Farmstead |
| Sun Camp Fireguard Cabin |
| Superior School |
| Suydam, Hester E., Boarding House |
| Swan Lake Rock House Historic District |
| Swanson Boathouse |
| Swiftcurrent Auto Camp Historic District |
| Swiftcurrent Fire Lookout |
| Swiftcurrent Ranger Station Historic District |
| Symes Hotel |
| Taylor, Ray E., House |
| Temple Emanu-El |
| Tenth Street Bridge |
| Teton County Courthouse |
| Thayer House |
| Theodore Roosevelt Memorial Bridge |
| Thexton Ranch |
| Thibodeau Electric Shop |
| Thierwechter House |
| Thompson Falls Hydroelectric Dam Historic District |
| Thorn House |
| Thornton Hospital |
| Thornwood School |
| Three Valleys State Bank |
| Toole, John R., House |
| Toston Bridge |
| Trident School |
| Trosdahl, Erick, House |
| Trowbridge Dairy |
| Troy Jail |
| Tupper, J. S., House |
| Two Medicine Campground Camptender's Cabin |
| Two Medicine General Store |
| Unemployment Compensation Commission Building |
| Union Bethel African Methodist Episcopal Church |
| Union City |
| Union League of America Hall |
| United Methodist Episcopal Church |
| University Apartments |
| University of Montana Historic District |
| Upper Kintla Lake Patrol Cabin |
| Upper Lake McDonald Ranger Station Historic District |
| Upper Logging Lake Snowshoe Cabin |
| Upper Madison School |
| Upper Nyack Snowshoe Cabin |
| Upper Park Creek Patrol Cabin |
| Ursuline Academy |
| Ursuline Convent of the Sacred Heart |
| US Customs Building |
| US Post Office |
| US Post Office-Anaconda Main |
| US Post Office and Courthouse-Billings |
| US Post Office and Courthouse-Glasgow Main |
| US Post Office and Courthouse-Great Falls |
| US Post Office and Courthouse-Havre Main |
| US Post Office and Federal Building-Lewistown |
| US Post Office-Dillon Main |
| US Post Office-Livingston Main |
| US Post Office-Miles City Main |
| Valier Public School |
| Vananda Historic District |
| Vance Lodge |
| VFW Club |
| Virgelle Mercantile and Virgelle State Bank |
| Waddell, George, House |
| Walker House |
| Wallin, Frank, House |
| Walsh's, Johnnie, Guest Lodge |
| Walton Ranger Station Historic District |
| Wamsley, Other C., House |
| Warden, O.S., Bridge |
| Warila Boarding House and Sauna |
| Washoe Theater |
| Wassweiler Hotel and Bath Houses |
| Watkins Creek Ranch |
| Wellman Block |
| West Entrance Station |
| Western Life Insurance Company Helena Branch Office |
| West Fork Butte Lookout |
| West Yellowstone Oregon Shortline Terminus Historic District |
| Whaley Homestead |
| Wheeler, Burton and Lulu, Cabin |
| Wibaux Commercial Historic District |
| Wick-Seiler House |
| Williams House |
| Williams, John and Ann, House |
| Wilma Theatre |
| Wilson House |
| Winnett Block |
| Winnett School |
| Wolf Creek Hotel |
| Woll House |
| Wood Lawn Farm |
| Wurtz Homestead |
| Yegen, Christian, House |
Data from United States Park Service and Wikidata
