| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Sears (historical) | city | Montana | United States | 47.54 | -104.29 | 1984 | |
| Sedan | city | Montana | United States | 45.96 | -110.85 | 5869 | |
| Seeley Lake | city | Montana | United States | 47.18 | -113.48 | 4189 | |
| Selma (historical) | city | Montana | United States | 48.21 | -111.13 | 3349 | |
| Selmes | city | Montana | United States | 45.39 | -109.13 | 4399 | |
| Seright (historical) | city | Montana | United States | 46.97 | -109.64 | 4288 | |
| Seven Mile (historical) | city | Montana | United States | 46.63 | -112.08 | 4189 | |
| Seventynine (historical) | city | Montana | United States | 46.15 | -109.29 | 4189 | |
| Seville Colony | city | Montana | United States | 48.70 | -112.58 | 4189 |