Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)
City | Rank | 2024 Pop. | 2020 Pop. | Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Fort Benton | 1 | 1,413 | 1,459 | -0.84% | 616 | 2.3 | City |
| Rocky Boy West | 2 | 945 | 836 | 0.43% | 174 | 5.4 | CDP |
| Big Sandy | 3 | 582 | 605 | -1.02% | 1,220 | 0.5 | Town |
| Sangrey | 4 | 534 | 418 | 3.29% | 85 | 6.3 | CDP |
| St. Pierre | 5 | 446 | 357 | 1.59% | 55 | 8.1 | CDP |
| Azure | 6 | 403 | 431 | 2.28% | 90 | 4.5 | CDP |
| Parker School | 7 | 395 | 659 | 1.02% | 53 | 7.4 | CDP |
| Boneau | 8 | 269 | 290 | -2.89% | 113 | 2.4 | CDP |
| Geraldine | 9 | 201 | 209 | -0.98% | 351 | 0.6 | Town |
| Highwood | 10 | 180 | 229 | 0.56% | 35 | 5.2 | CDP |
| Rocky Boy's Agency | 11 | 179 | 353 | -6.28% | 21 | 8.6 | CDP |
| Carter | 12 | 110 | 99 | 7.84% | 38 | 2.9 | CDP |
| Loma | 13 | 94 | 121 | 6.82% | 27 | 3.4 | CDP |
| Midway Colony | 14 | 37 | 74 | 5.71% | 70 | 0.5 | CDP |
| Twin Hills Colony | 15 | 29 | 0 | 7.41% | 79 | 0.4 | CDP |
| Floweree | 16 | 26 | 11 | 8.33% | 22 | 1.2 | CDP |
| Square Butte | 17 | 24 | 14 | 4.35% | 87 | 0.3 | CDP |
Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.
Fort Benton is the largest city in Chouteau County.
Square Butte is the smallest city in Chouteau County.
There are 17 cities in Chouteau County, Montana.