| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Spartan Manor Trailer Park | city | Montana | United States | 48.17 | -111.95 | 3540 | |
| Spear | city | Montana | United States | 45.20 | -107.38 | 3559 | |
| Speer Trailer Park | city | Montana | United States | 48.17 | -111.95 | 3540 | |
| Sperry Chalets | city | Montana | United States | 48.60 | -113.79 | 7549 | |
| Sphinx | city | Montana | United States | 45.17 | -110.88 | 5200 | |
| Spion Kop | city | Montana | United States | 47.28 | -110.62 | 4399 | |
| Split Rock Junction | city | Montana | United States | 47.52 | -112.46 | 4376 | |
| Spring Creek Junction | city | Montana | United States | 47.13 | -109.57 | 3700 | |
| Spring Grove Trailer Court | city | Montana | United States | 47.11 | -104.74 | 2073 | |
| Spring Gulch | city | Montana | United States | 47.23 | -114.98 | 2798 | |
| Spring Valley (historical) | city | Montana | United States | 47.69 | -114.35 | 3349 | |
| Springdale | city | Montana | United States | 45.74 | -110.23 | 4350 | |
| Springdale Colony | city | Montana | United States | 46.46 | -111.02 | 5216 | |
| Springhill | city | Montana | United States | 45.84 | -111.03 | 5029 | |
| Springhill Park | city | Montana | United States | 45.73 | -111.06 | 5029 | |
| Springtime | city | Montana | United States | 45.70 | -109.39 | 4189 | |
| Springtown | city | Montana | United States | 46.80 | -113.28 | 5869 | |
| Springwater Colony | city | Montana | United States | 46.46 | -109.76 | 4399 | |
| Sprinkle Trailer Court | city | Montana | United States | 48.59 | -109.23 | 2509 | |
| Sprole | city | Montana | United States | 48.11 | -105.06 | 1998 | |
| Spurling | city | Montana | United States | 45.65 | -108.85 | 3366 |