| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Stacey | city | Montana | United States | 45.72 | -105.89 | 3349 | |
| Staley Place | city | Montana | United States | 46.24 | -110.66 | 5869 | |
| Stanford | city | Montana | United States | 47.15 | -110.22 | 4304 | |
| Star | city | Montana | United States | 48.54 | -113.21 | 5029 | |
| Star Addition | city | Montana | United States | 45.66 | -110.56 | 4501 | |
| Star Mobile Home Park | city | Montana | United States | 45.78 | -111.18 | 4471 | |
| Stark | city | Montana | United States | 47.13 | -114.51 | 3349 | |
| Starr School | city | Montana | United States | 48.59 | -113.14 | 5029 | |
| Staton | city | Montana | United States | 46.09 | -112.87 | 5173 | |
| Stephensons Trailer Court | city | Montana | United States | 47.42 | -105.59 | 2509 | |
| Sterling | city | Montana | United States | 45.57 | -111.76 | 5068 | |
| Steve Forks | city | Montana | United States | 47.27 | -107.33 | 2880 | |
| Stevensville | city | Montana | United States | 46.51 | -114.09 | 3398 | |
| Stipek | city | Montana | United States | 47.21 | -104.66 | 2024 | |
| Stipes Trailer Court | city | Montana | United States | 48.39 | -114.06 | 3349 | |
| Stockett | city | Montana | United States | 47.36 | -111.17 | 4189 | |
| Stone | city | Montana | United States | 46.51 | -113.23 | 4586 | |
| Stonehill (historical) | city | Montana | United States | 48.75 | -115.30 | 3349 | |
| Stoner Place | city | Montana | United States | 47.51 | -112.73 | 5869 | |
| Stones Trailer Park | city | Montana | United States | 45.40 | -108.97 | 4199 | |
| Storrs (historical) | city | Montana | United States | 45.63 | -110.84 | 5869 | |
| Story | city | Montana | United States | 45.73 | -111.08 | 5029 | |
| Stovepipe (historical) | city | Montana | United States | 47.03 | -114.32 | 3349 | |
| Stranahan | city | Montana | United States | 48.00 | -110.32 | 2598 | |
| Straw | city | Montana | United States | 46.85 | -109.79 | 4242 | |
| Stringtown (historical) | city | Montana | United States | 45.75 | -111.77 | 5029 | |
| Stringtown (historical) | city | Montana | United States | 46.04 | -112.55 | 6709 | |
| Strom | city | Montana | United States | 46.89 | -112.31 | 5029 | |
| Stryker | city | Montana | United States | 48.67 | -114.77 | 3398 | |
| Stuart | city | Montana | United States | 46.09 | -112.80 | 5029 | |
| Stump Town | city | Montana | United States | 46.15 | -113.04 | 5869 | |
| Stump Town (historical) | city | Montana | United States | 46.83 | -113.35 | 5928 | |
| Stumps Subdivision | city | Montana | United States | 45.66 | -110.56 | 4501 |