| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Kalispell | 1 | 33,341 | 25,263 | 4.68% | 2,536 | 13 | City |
| Whitefish | 2 | 9,700 | 7,886 | 3.65% | 1,312 | 7 | City |
| Columbia Falls | 3 | 5,830 | 5,396 | 1.34% | 2,556 | 2 | City |
Kalispell is the largest city in Flathead County, with a population of 33,341.
Columbia Falls is the smallest city in Flathead County, with a population of 5,830.
There are 3 cities in Flathead County, Montana.