16 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Red Lodge | 1 | 2,838 | 2,267 | 4.19% | 1,046 | 2.71 | City |
| Bridger | 2 | 747 | 664 | 2.33% | 937 | 0.80 | Town |
| Joliet | 3 | 648 | 578 | 2.21% | 2,365 | 0.27 | Town |
| Fromberg | 4 | 440 | 395 | 2.09% | 991 | 0.44 | Town |
| Rockvale | 5 | 394 | 168 | 7.07% | 237 | 1.66 | CDP |
| Roberts | 6 | 261 | 298 | -2.61% | 66 | 3.98 | CDP |
| Bridger | 7 | 211 | 155 | 7.11% | 59 | 3.60 | CDP |
| Belfry | 8 | 168 | 304 | -1.75% | 101 | 1.67 | CDP |
| Montaqua | 9 | 123 | 86 | 7.89% | 87 | 1.41 | CDP |
| Bearcreek | 10 | 105 | 89 | 2.94% | 921 | 0.11 | Town |
| Edgar | 11 | 102 | 148 | 0% | 150 | 0.68 | CDP |
| Fox | 12 | 89 | 38 | 7.23% | 30 | 2.94 | CDP |
| Luther | 13 | 49 | 35 | 6.52% | 86 | 0.57 | CDP |
| Boyd | 14 | 45 | 64 | 7.14% | 164 | 0.28 | CDP |
| Roscoe | 15 | 30 | 41 | 7.14% | 132 | 0.23 | CDP |
| Silesia | 16 | 14 | 16 | 7.69% | 7 | 1.87 | CDP |
Red Lodge is the largest city in Carbon County, with a population of 2,838.
Silesia is the smallest city in Carbon County.
There are 16 cities in Carbon County, Montana.