Montana - Criteria: B (person)
| Silver King Ranch |
| Silverman, Morris, House |
| Slayton Mercantile Co. |
| Swan Lake Rock House Historic District |
| Thorn House |
| Thornton Hospital |
| Three Forks of the Missouri |
| Toole, John R., House |
| Tower Rock |
| Virgelle Mercantile and Virgelle State Bank |
| Watkins Creek Ranch |
| Wheeler, Burton and Lulu, Cabin |
| Wheeler, Burton K., House |
| Wibaux Commercial Historic District |
| Wibaux, Pierre, House |
| Wilma Theatre |
| Winnett Block |
| Wolf Mountains Battlefield-Where Big Crow walked Back and Forth |
| Yegen, Christian, House |
| Yegen, Peter, House |
| Yucca Theatre |
Data from United States Park Service and Wikidata
