16 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Fort Benton | 1 | 1,402 | 1,459 | -0.78% | 611 | 2.29 | City |
| Rocky Boy West | 2 | 949 | 836 | 0.42% | 174 | 5.45 | CDP |
| Big Sandy | 3 | 576 | 605 | -1.03% | 1,208 | 0.48 | Town |
| Sangrey | 4 | 550 | 418 | 3% | 87 | 6.31 | CDP |
| St. Pierre | 5 | 452 | 357 | 1.35% | 56 | 8.08 | CDP |
| Azure | 6 | 411 | 431 | 1.99% | 91 | 4.50 | CDP |
| Parker School | 7 | 399 | 659 | 1.01% | 54 | 7.39 | CDP |
| Boneau | 8 | 261 | 290 | -2.97% | 110 | 2.37 | CDP |
| Geraldine | 9 | 199 | 209 | -1% | 347 | 0.57 | Town |
| Highwood | 10 | 180 | 229 | 0% | 35 | 5.18 | CDP |
| Rocky Boy's Agency | 11 | 166 | 353 | -7.26% | 19 | 8.57 | CDP |
| Carter | 12 | 117 | 99 | 6.36% | 40 | 2.90 | CDP |
| Loma | 13 | 101 | 121 | 7.45% | 29 | 3.44 | CDP |
| Midway Colony | 14 | 40 | 74 | 8.11% | 76 | 0.53 | CDP |
| Floweree | 15 | 27 | 11 | 3.85% | 23 | 1.18 | CDP |
| Square Butte | 16 | 26 | 14 | 8.33% | 95 | 0.28 | CDP |
Fort Benton is the largest city in Chouteau County, with a population of 1,402.
Square Butte is the smallest city in Chouteau County.
There are 16 cities in Chouteau County, Montana.