5 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Bozeman | 1 | 59,908 | 53,865 | 1.71% | 2,802 | 21 | City |
| Belgrade | 2 | 13,765 | 10,693 | 3.86% | 2,301 | 6 | City |
| Manhattan | 3 | 2,058 | 2,087 | -0.24% | 1,173 | 2 | Town |
| Three Forks | 4 | 1,926 | 1,983 | -0.47% | 1,338 | 1 | City |
| West Yellowstone | 5 | 1,164 | 1,277 | -1.61% | 1,282 | 1 | Town |
Bozeman is the largest city in Gallatin County, with a population of 59,908.
West Yellowstone is the smallest city in Gallatin County, with a population of 1,164.
There are 5 cities in Gallatin County, Montana.