22 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Great Falls | 1 | 59,903 | 60,453 | -0.18% | 2,590 | 23 | City |
| Malmstrom AFB | 2 | 4,483 | 3,902 | 1.52% | 878 | 5 | CDP |
| Sun Prairie | 3 | 1,300 | 1,617 | -1.66% | 245 | 5 | CDP |
| Vaughn | 4 | 1,054 | 877 | 2.53% | 295 | 4 | CDP |
| Ulm | 5 | 964 | 750 | 1.58% | 48 | 20 | CDP |
| Black Eagle | 6 | 614 | 836 | -3% | 398 | 2 | CDP |
| Cascade | 7 | 575 | 593 | -0.69% | 877 | 1 | Town |
| Belt | 8 | 518 | 503 | 0.58% | 1,533 | 0 | Town |
| Simms | 9 | 323 | 338 | -0.62% | 42 | 8 | CDP |
| Sand Coulee | 10 | 226 | 201 | 0.44% | 84 | 3 | CDP |
| Stockett | 11 | 145 | 189 | -1.36% | 93 | 2 | CDP |
| Fort Shaw | 12 | 134 | 138 | -6.94% | 24 | 6 | CDP |
| Tracy | 13 | 93 | 147 | 8.14% | 251 | 0 | CDP |
| Hardy | 14 | 85 | 69 | 7.59% | 75 | 1 | CDP |
| Gibson Flats | 15 | 53 | 205 | -14.52% | 16 | 3 | CDP |
| Monarch | 16 | 47 | 5 | 6.82% | 59 | 1 | CDP |
| Sun River | 17 | 42 | 41 | -10.64% | 23 | 2 | CDP |
| Neihart | 18 | 41 | 43 | -2.38% | 21 | 2 | Town |
| Big Stone Colony | 19 | 39 | 113 | 8.33% | 41 | 1 | CDP |
| Cascade Colony | 20 | 29 | 44 | 7.41% | 34 | 1 | CDP |
| Centerville | 21 | 11 | 26 | 10% | 18 | 1 | CDP |
| Riceville | 22 | 6 | 34 | 0% | 7 | 1 | CDP |
Great Falls is the largest city in Cascade County, with a population of 59,903.
Riceville is the smallest city in Cascade County, with a population of 6.
There are 22 cities in Cascade County, Montana.