| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Thompson Falls | 1 | 1,583 | 1,365 | 2.59% | 993 | 2 | City |
| Plains | 2 | 1,293 | 1,115 | 2.54% | 2,102 | 1 | Town |
| Hot Springs | 3 | 645 | 563 | 2.38% | 1,349 | 0 | Town |
Thompson Falls is the largest city in Sanders County, with a population of 1,583.
Hot Springs is the smallest city in Sanders County, with a population of 645.
There are 3 cities in Sanders County, Montana.