| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Columbus | 1 | 1,987 | 1,865 | 1.17% | 1,447 | 1 | Town |
Columbus is the largest city in Stillwater County, with a population of 1,987.
Columbus is the smallest city in Stillwater County, with a population of 1,987.
There is 1 city in Stillwater County, Montana.