7 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Chester | 1 | 832 | 847 | -0.36% | 1,708 | 0 | Town |
| Riverview Colony | 2 | 331 | 326 | 7.12% | 366 | 1 | CDP |
| Joplin | 3 | 287 | 242 | 3.24% | 227 | 1 | CDP |
| Camrose Colony | 4 | 95 | 35 | 6.74% | 255 | 0 | CDP |
| Eagle Creek Colony | 5 | 68 | 100 | 7.94% | 170 | 0 | CDP |
| Sage Creek Colony | 6 | 29 | 63 | 7.41% | 123 | 0 | CDP |
| Whitlash | 7 | 5 | 18 | 0% | 114 | 0 | CDP |
Chester is the largest city in Liberty County, with a population of 832.
Whitlash is the smallest city in Liberty County, with a population of 5.
There are 7 cities in Liberty County, Montana.