3 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Thompson Falls | 1 | 1,565 | 1,367 | 2.56% | 982 | 2 | City |
| Plains | 2 | 1,276 | 1,115 | 2.57% | 2,075 | 1 | Town |
| Hot Springs | 3 | 638 | 562 | 2.41% | 1,335 | 0 | Town |
Thompson Falls is the largest city in Sanders County, with a population of 1,565.
Hot Springs is the smallest city in Sanders County, with a population of 638.
There are 3 cities in Sanders County, Montana.