3 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Arco | 1 | 962 | 882 | 1.69% | 901 | 1.07 | City |
| Moore | 2 | 184 | 163 | 2.22% | 648 | 0.28 | City |
| Butte City | 3 | 89 | 79 | 2.3% | 527 | 0.17 | City |
Arco is the largest city in Butte County, with a population of 962.
Butte City is the smallest city in Butte County.
There are 3 cities in Butte County, Idaho.