| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Swan Lake | city | Montana | United States | 47.93 | -113.84 | 3349 | |
| Swan River | city | Montana | United States | 48.10 | -114.03 | 3349 | |
| Swan River (historical) | city | Montana | United States | 48.10 | -114.03 | 3349 | |
| Sweeney Creek (historical) | city | Montana | United States | 46.61 | -114.09 | 3398 | |
| Sweet Grass | city | Montana | United States | 49.00 | -111.96 | 3579 | |
| Sweetgrass | city | Montana | United States | 49.00 | -111.96 | 3579 | |
| Sweetwater (historical) | city | Montana | United States | 45.12 | -112.18 | 5869 | |
| Swiftcurrent | city | Montana | United States | 48.80 | -113.67 | 5029 |