3 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Fort Benton | 1 | 1,405 | 1,456 | -0.57% | 613 | 2 | City |
| Big Sandy | 2 | 594 | 623 | -0.83% | 1,245 | 0 | Town |
| Geraldine | 3 | 203 | 211 | -0.49% | 354 | 1 | Town |
Fort Benton is the largest city in Chouteau County, with a population of 1,405.
Geraldine is the smallest city in Chouteau County, with a population of 203.
There are 3 cities in Chouteau County, Montana.