5 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Belle Fourche | 1 | 5,906 | 5,648 | 0.87% | 651 | 9 | City |
| Newell | 2 | 586 | 578 | 0.17% | 579 | 1 | City |
| Nisland | 3 | 212 | 207 | 0.47% | 788 | 0 | Town |
| Vale | 4 | 123 | 114 | 0.82% | 318 | 0 | Township |
| Union | 5 | 21 | 19 | 0% | 0.00 | 141 | Township |
Belle Fourche is the largest city in Butte County, with a population of 5,906.
Union is the smallest city in Butte County, with a population of 21.
There are 5 cities in Butte County, South Dakota.