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 |
|---|---|---|---|---|---|---|---|
| Great Falls | 1 | 60,414 | 60,446 | -0.01% | 2,612 | 23.1 | City |
| Malmstrom AFB | 2 | 4,416 | 3,902 | 1.56% | 865 | 5.1 | CDP |
| Sun Prairie | 3 | 1,322 | 1,617 | -1.64% | 250 | 5.3 | CDP |
| Vaughn | 4 | 1,028 | 877 | 2.7% | 288 | 3.6 | CDP |
| Ulm | 5 | 949 | 750 | 1.61% | 47 | 20.3 | CDP |
| Black Eagle | 6 | 633 | 836 | -3.06% | 411 | 1.5 | CDP |
| Cascade | 7 | 584 | 596 | -0.51% | 890 | 0.7 | Town |
| Belt | 8 | 526 | 512 | 0.57% | 1,556 | 0.3 | Town |
| Simms | 9 | 325 | 338 | -0.61% | 43 | 7.6 | CDP |
| Sand Coulee | 10 | 225 | 201 | 0.45% | 84 | 2.7 | CDP |
| Stockett | 11 | 147 | 189 | -0.68% | 94 | 1.6 | CDP |
| Fort Shaw | 12 | 144 | 138 | -5.88% | 25 | 5.7 | CDP |
| Tracy | 13 | 86 | 147 | 7.5% | 232 | 0.4 | CDP |
| Hardy | 14 | 79 | 69 | 6.76% | 70 | 1.1 | CDP |
| Gibson Flats | 15 | 62 | 205 | -13.89% | 19 | 3.3 | CDP |
| Pleasant Valley Colony | 16 | 52 | 0 | 6.12% | 209 | 0.2 | CDP |
| Sun River | 17 | 47 | 41 | -9.62% | 25 | 1.9 | CDP |
| Monarch | 18 | 44 | 5 | 7.32% | 55 | 0.8 | CDP |
| Neihart | 19 | 39 | 41 | -2.5% | 20 | 2.0 | Town |
| Big Stone Colony | 20 | 36 | 113 | 5.88% | 38 | 0.9 | CDP |
| Cascade Colony | 21 | 27 | 44 | 8% | 32 | 0.9 | CDP |
| Centerville | 22 | 10 | 26 | 0% | 17 | 0.6 | CDP |
| Riceville | 23 | 6 | 34 | 20% | 7 | 0.9 | 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.
Great Falls is the largest city in Cascade County.
Riceville is the smallest city in Cascade County.
There are 23 cities in Cascade County, Montana.