14 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Fort Belknap Agency | 1 | 1,518 | 1,520 | 1% | 33 | 45.50 | CDP |
| Hays | 2 | 1,158 | 947 | 1.85% | 43 | 27.10 | CDP |
| Chinook | 3 | 1,149 | 1,176 | -0.43% | 2,197 | 0.52 | City |
| Havre North | 4 | 881 | 593 | 1.26% | 263 | 3.35 | CDP |
| Harlem | 5 | 747 | 769 | -0.53% | 1,787 | 0.42 | City |
| Beaver Creek | 6 | 410 | 424 | 2.5% | 89 | 4.59 | CDP |
| Lodge Pole | 7 | 233 | 344 | -0.85% | 17 | 13.39 | CDP |
| Saddle Butte | 8 | 193 | 101 | 2.12% | 77 | 2.51 | CDP |
| West Havre | 9 | 101 | 130 | -12.17% | 53 | 1.89 | CDP |
| Turner | 10 | 86 | 95 | 7.5% | 193 | 0.45 | CDP |
| North Harlem Colony | 11 | 71 | 26 | 7.58% | 242 | 0.29 | CDP |
| Zurich | 12 | 50 | 65 | 6.38% | 93 | 0.54 | CDP |
| Hogeland | 13 | 27 | 24 | 3.85% | 53 | 0.51 | CDP |
| Herron | 14 | 6 | 188 | -53.85% | 1 | 4.68 | CDP |
Fort Belknap Agency is the largest city in Blaine County, with a population of 1,518.
Herron is the smallest city in Blaine County.
There are 14 cities in Blaine County, Montana.