3 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Thompson Falls | 1 | 1,605 | 1,367 | 2.56% | 1,007 | 2 | City |
| Plains | 2 | 1,308 | 1,115 | 2.51% | 2,127 | 1 | Town |
| Hot Springs | 3 | 653 | 562 | 2.35% | 1,366 | 0 | Town |
Thompson Falls is the largest city in Sanders County, with a population of 1,605.
Hot Springs is the smallest city in Sanders County, with a population of 653.
There are 3 cities in Sanders County, Montana.