4 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Soda Springs | 1 | 3,204 | 3,121 | 0.53% | 724 | 4.43 | City |
| Star Valley Ranch | 2 | 2,155 | 1,872 | 2.72% | 794 | 2.71 | Town |
| Grace | 3 | 961 | 921 | 0.84% | 964 | 1 | City |
| Bancroft | 4 | 321 | 296 | 1.58% | 527 | 0.61 | City |
Soda Springs is the largest city in Caribou County, with a population of 3,204.
Bancroft is the smallest city in Caribou County.
There are 4 cities in Caribou County, Idaho.