2 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Big Timber | 1 | 1,691 | 1,638 | 0.59% | 1,731 | 1 | City |
| Greycliff | 2 | 86 | 133 | -2.27% | 169 | 1 | CDP |
Big Timber is the largest city in Sweet Grass County, with a population of 1,691.
Greycliff is the smallest city in Sweet Grass County, with a population of 86.
There are 2 cities in Sweet Grass County, Montana.