4 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Horseshoe Bend | 1 | 856 | 725 | 3.13% | 787 | 1 | City |
| Idaho City | 2 | 552 | 471 | 2.99% | 830 | 1 | City |
| Crouch | 3 | 184 | 159 | 2.79% | 372 | 0 | City |
| Placerville | 4 | 48 | 46 | 0% | 48 | 1 | City |
Horseshoe Bend is the largest city in Boise County, with a population of 856.
Placerville is the smallest city in Boise County, with a population of 48.
There are 4 cities in Boise County, Idaho.