3 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 |
Belle Fourche is the largest city in Butte County, with a population of 5,958.
Nisland is the smallest city in Butte County, with a population of 213.
There are 3 cities in Butte County, South Dakota.