| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| American Falls | 1 | 4,852 | 4,567 | 1.4% | 3,006 | 2 | City |
| Rockland | 2 | 262 | 239 | 1.95% | 900 | 0 | City |
American Falls is the largest city in Power County, with a population of 4,852.
Rockland is the smallest city in Power County, with a population of 262.
There are 2 cities in Power County, Idaho.