4 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Horseshoe Bend | 1 | 882 | 725 | 3.04% | 811 | 1 | City |
| Idaho City | 2 | 568 | 471 | 2.9% | 854 | 1 | City |
| Crouch | 3 | 189 | 159 | 2.72% | 382 | 0 | City |
| Placerville | 4 | 49 | 46 | 2.08% | 49 | 1 | City |
Horseshoe Bend is the largest city in Boise County, with a population of 882.
Placerville is the smallest city in Boise County, with a population of 49.
There are 4 cities in Boise County, Idaho.