16 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Boise City | Ada County | 235,012 |
| Blackfoot | Bingham County | 13,380 |
| Burley | Cassia County | 12,404 |
| Buhl | Twin Falls County | 4,813 |
| Bonners Ferry | Boundary County | 2,805 |
| Bellevue | Blaine County | 2,582 |
| Blanchard | Bonner County | 482 |
| Basalt | Bingham County | 380 |
| Bancroft | Caribou County | 321 |
| Bliss | Gooding County | 269 |
| Bloomington | Bear Lake County | 225 |
| Bovill | Latah County | 202 |
| Bennington | Bear Lake County | 130 |
| Butte City | Butte County | 89 |
| Bruneau | Owyhee County | 51 |
| Banks | Boise County | 6 |