| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Fort Benton | 1 | 1,406 | 1,454 | -0.71% | 613 | 2 | City |
| Big Sandy | 2 | 592 | 623 | -1% | 1,241 | 0 | Town |
| Geraldine | 3 | 202 | 211 | -0.98% | 353 | 1 | Town |
Fort Benton is the largest city in Chouteau County, with a population of 1,406.
Geraldine is the smallest city in Chouteau County, with a population of 202.
There are 3 cities in Chouteau County, Montana.