12 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Dillon | 1 | 4,370 | 3,884 | 2.27% | 2,302 | 2 | City |
| Lima | 2 | 222 | 209 | 1.37% | 397 | 1 | Town |
| Wisdom | 3 | 134 | 132 | 7.2% | 133 | 1 | CDP |
| Argenta | 4 | 115 | 95 | 7.48% | 386 | 0 | CDP |
| Maverick Mountain | 5 | 72 | 88 | 5.88% | 39 | 2 | CDP |
| Glen | 6 | 70 | 78 | 7.69% | 241 | 0 | CDP |
| Grant | 7 | 47 | 30 | 6.82% | 27 | 2 | CDP |
| Lakeview | 8 | 39 | 33 | 8.33% | 51 | 1 | CDP |
| Dell | 9 | 32 | 5 | 6.67% | 72 | 0 | CDP |
| Wise River | 10 | 30 | 34 | 7.14% | 41 | 1 | CDP |
| Jackson | 11 | 20 | 26 | 5.26% | 21 | 1 | CDP |
| Dewey | 12 | 15 | 13 | 7.14% | 57 | 0 | CDP |
Dillon is the largest city in Beaverhead County, with a population of 4,370.
Dewey is the smallest city in Beaverhead County, with a population of 15.
There are 12 cities in Beaverhead County, Montana.