| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Soda Springs | 1 | 3,176 | 3,114 | 0.35% | 717 | 4 | City |
| Star Valley Ranch | 2 | 2,115 | 1,874 | 1.98% | 779 | 3 | Town |
| Grace | 3 | 942 | 922 | 0.43% | 816 | 1 | City |
| Bancroft | 4 | 321 | 298 | 1.26% | 527 | 1 | City |
Soda Springs is the largest city in Caribou County, with a population of 3,176.
Bancroft is the smallest city in Caribou County, with a population of 321.
There are 4 cities in Caribou County, Idaho.