| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Horseshoe Bend | 1 | 839 | 724 | 2.82% | 772 | 1 | City |
| Idaho City | 2 | 546 | 472 | 2.82% | 821 | 1 | City |
| Crouch | 3 | 185 | 160 | 2.21% | 374 | 0 | City |
| Placerville | 4 | 48 | 47 | 0% | 48 | 1 | City |
Horseshoe Bend is the largest city in Boise County, with a population of 839.
Placerville is the smallest city in Boise County, with a population of 48.
There are 4 cities in Boise County, Idaho.