7 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Horseshoe Bend | 1 | 909 | 726 | 4.24% | 836 | 1.09 | City |
| Idaho City | 2 | 569 | 468 | 3.64% | 856 | 0.67 | City |
| Garden Valley | 3 | 413 | 475 | 0.24% | 56 | 7.33 | CDP |
| Crouch | 4 | 189 | 159 | 3.28% | 382 | 0.49 | City |
| Placerville | 5 | 49 | 46 | 2.08% | 49 | 1 | City |
| Lowman | 6 | 27 | 14 | 3.85% | 13 | 2.03 | CDP |
| Banks | 7 | 6 | 6 | 0% | 3 | 2.21 | CDP |
Horseshoe Bend is the largest city in Boise County, with a population of 909.
Banks is the smallest city in Boise County.
There are 7 cities in Boise County, Idaho.