5 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Belle Fourche | 1 | 5,958 | 5,648 | 0.88% | 657 | 9 | City |
| Newell | 2 | 588 | 578 | 0.34% | 581 | 1 | City |
| Nisland | 3 | 213 | 207 | 0.47% | 792 | 0 | Town |
| Vale | 4 | 124 | 114 | 0.81% | 320 | 0 | Township |
| Union | 5 | 21 | 19 | 0% | 0.00 | 141 | Township |
Belle Fourche is the largest city in Butte County, with a population of 5,958.
Union is the smallest city in Butte County, with a population of 21.
There are 5 cities in Butte County, South Dakota.