23 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Great Falls | 1 | 60,406 | 60,446 | -0.01% | 2,611 | 23.13 | City |
| Malmstrom AFB | 2 | 4,483 | 3,902 | 1.52% | 878 | 5.11 | CDP |
| Sun Prairie | 3 | 1,300 | 1,617 | -1.66% | 245 | 5.30 | CDP |
| Vaughn | 4 | 1,054 | 877 | 2.53% | 295 | 3.58 | CDP |
| Ulm | 5 | 964 | 750 | 1.58% | 48 | 20.26 | CDP |
| Black Eagle | 6 | 614 | 836 | -3% | 398 | 1.54 | CDP |
| Cascade | 7 | 581 | 596 | -0.51% | 886 | 0.66 | Town |
| Belt | 8 | 530 | 512 | 0.76% | 1,568 | 0.34 | Town |
| Simms | 9 | 323 | 338 | -0.61% | 42 | 7.61 | CDP |
| Sand Coulee | 10 | 226 | 201 | 0.44% | 84 | 2.69 | CDP |
| Stockett | 11 | 145 | 189 | -1.36% | 93 | 1.57 | CDP |
| Fort Shaw | 12 | 134 | 138 | -6.94% | 24 | 5.68 | CDP |
| Tracy | 13 | 93 | 147 | 8.14% | 251 | 0.37 | CDP |
| Hardy | 14 | 85 | 69 | 7.6% | 75 | 1.13 | CDP |
| Pleasant Valley Colony | 15 | 56 | 0 | 7.69% | 225 | 0.25 | CDP |
| Gibson Flats | 16 | 53 | 205 | -14.52% | 16 | 3.34 | CDP |
| Monarch | 17 | 47 | 5 | 6.82% | 59 | 0.80 | CDP |
| Sun River | 18 | 42 | 41 | -10.64% | 23 | 1.86 | CDP |
| Big Stone Colony | 19 | 39 | 113 | 8.33% | 41 | 0.94 | CDP |
| Neihart | 20 | 39 | 41 | 0% | 20 | 1.99 | Town |
| Cascade Colony | 21 | 29 | 44 | 7.41% | 34 | 0.85 | CDP |
| Centerville | 22 | 11 | 26 | 10% | 18 | 0.60 | CDP |
| Riceville | 23 | 6 | 34 | 0% | 7 | 0.88 | CDP |
Great Falls is the largest city in Cascade County, with a population of 60,406.
Riceville is the smallest city in Cascade County.
There are 23 cities in Cascade County, Montana.