3 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Arco | 1 | 927 | 879 | 0.87% | 868 | 1 | City |
| Moore | 2 | 181 | 163 | 1.69% | 637 | 0 | City |
| Butte City | 3 | 89 | 79 | 2.3% | 527 | 0 | City |
Arco is the largest city in Butte County, with a population of 927.
Butte City is the smallest city in Butte County, with a population of 89.
There are 3 cities in Butte County, Idaho.