7 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Columbus | 1 | 1,931 | 1,868 | 0.68% | 1,406 | 1.37 | Town |
| Park City | 2 | 1,032 | 1,090 | 0.39% | 656 | 1.57 | CDP |
| Absarokee | 3 | 799 | 1,048 | -2.8% | 373 | 2.14 | CDP |
| Reed Point | 4 | 170 | 247 | -1.16% | 306 | 0.56 | CDP |
| Fishtail | 5 | 135 | 140 | 7.14% | 234 | 0.58 | CDP |
| Rapelje | 6 | 114 | 105 | 7.55% | 231 | 0.49 | CDP |
| Nye | 7 | 79 | 39 | 6.76% | 224 | 0.35 | CDP |
Columbus is the largest city in Stillwater County, with a population of 1,931.
Nye is the smallest city in Stillwater County, with a population of 79.
There are 7 cities in Stillwater County, Montana.