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 Belknap Agency | 1 | 1,503 | 1,520 | 1.01% | 33 | 45.5 | CDP |
| Chinook | 2 | 1,154 | 1,176 | -0.52% | 2,207 | 0.5 | City |
| Hays | 3 | 1,137 | 947 | 1.88% | 42 | 27.1 | CDP |
| Havre North | 4 | 870 | 593 | 1.28% | 260 | 3.4 | CDP |
| Harlem | 5 | 751 | 769 | -0.66% | 1,797 | 0.4 | City |
| Beaver Creek | 6 | 400 | 424 | 2.3% | 87 | 4.6 | CDP |
| Lodge Pole | 7 | 235 | 344 | -0.84% | 18 | 13.4 | CDP |
| Saddle Butte | 8 | 189 | 101 | 2.72% | 75 | 2.5 | CDP |
| West Havre | 9 | 115 | 130 | -11.54% | 61 | 1.9 | CDP |
| Turner | 10 | 80 | 95 | 6.67% | 180 | 0.4 | CDP |
| Turner Colony | 11 | 74 | 0 | 8.82% | 121 | 0.6 | CDP |
| North Harlem Colony | 12 | 66 | 26 | 6.45% | 225 | 0.3 | CDP |
| Zurich | 13 | 47 | 65 | 9.3% | 88 | 0.5 | CDP |
| Hilldale Colony | 14 | 29 | 0 | 7.41% | 82 | 0.4 | CDP |
| Hogeland | 15 | 26 | 24 | 8.33% | 51 | 0.5 | CDP |
| Herron | 16 | 13 | 188 | -38.09% | 3 | 4.7 | 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 Belknap Agency is the largest city in Blaine County.
Herron is the smallest city in Blaine County.
There are 16 cities in Blaine County, Montana.