Montana - Significance region: Local
| Theodore Roosevelt Memorial Bridge |
| Thexton Ranch |
| Thibodeau Electric Shop |
| Thierwechter House |
| Thorn House |
| Thornton Hospital |
| Thornwood School |
| Three Valleys State Bank |
| Toole, John R., House |
| Torgrimson Place |
| Toston Bridge |
| Tourist Hotel |
| Trident School |
| Trosdahl, Erick, House |
| Trowbridge Dairy |
| Troy Jail |
| Trytten, J. M., House |
| Tupper, J. S., House |
| Two Medicine Campground Camptender's Cabin |
| Union Bethel African Methodist Episcopal Church |
| United Methodist Episcopal Church |
| University Apartments |
| University Heights Historic District |
| Upper Madison School |
| Urbach Cabin |
| U. S. Post Office |
| U.S. Post Office |
| US Post Office |
| Valier Public School |
| Valley Masonic Lodge No. 21 |
| Vananda Historic District |
| Van Camp-Tash Ranch |
| Vance Lodge |
| VFW Club |
| Vogt-Nunberg Farm |
| Waddell, George, House |
| Waggener & Campbell Funeral Home |
| Walker House |
| Wallin, Frank, House |
| Wamsley, Other C., House |
| Ward Hotel |
| Warila Boarding House and Sauna |
| Watkins Creek Ranch |
| Weber's Store |
| Wellman Block |
| West Entrance Station |
| Western Life Insurance Company Helena Branch Office |
| Westgate Village Shopping Center |
| West Side Historic District |
| West Side Historic District |
| West Side Residential District |
| West Yellowstone Oregon Shortline Terminus Historic District |
| Wetzstein/Tipton Ranch |
| Wheeler, Burton and Lulu, Cabin |
| Wibaux Commercial Historic District |
| Wick-Seiler House |
| Wiley, Clark & Greening Bank |
| Williams House |
| Williams, John and Ann, House |
| Williams Street Bridge |
| Wilson House |
| Winnett Block |
| Winnett School |
| Wise River Ranger Station |
| Wold Barn |
| Wolf Creek Hotel |
| Woll House |
| Wool Warehouse |
| Wurtz Homestead |
| Yegen, Christian, House |
| Yegen, Peter, House |
| Yellowstone River Bridge |
| Yodeler Motel |
| Young-Almas House |
| Young, Alvin, Barn and Cabin Historic District |
| Young, Benjamin, House |
| Young Brothers Chevrolet Garage |
| Young Women's Christian Association (Independent) |
| Zion Swedish Evangelical Lutheran Church |
| Zip Auto |
| Zortman Ranger Station Historic District |
Data from United States Park Service and Wikidata
