5 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Bozeman | 1 | 58,901 | 53,865 | 1.74% | 2,755 | 21 | City |
| Belgrade | 2 | 13,253 | 10,693 | 4.02% | 2,215 | 6 | City |
| Manhattan | 3 | 2,063 | 2,087 | -0.24% | 1,175 | 2 | Town |
| Three Forks | 4 | 1,935 | 1,983 | -0.51% | 1,345 | 1 | City |
| West Yellowstone | 5 | 1,183 | 1,277 | -1.58% | 1,303 | 1 | Town |
Bozeman is the largest city in Gallatin County, with a population of 58,901.
West Yellowstone is the smallest city in Gallatin County, with a population of 1,183.
There are 5 cities in Gallatin County, Montana.