4 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Soda Springs | 1 | 3,174 | 3,113 | 0.38% | 717 | 4 | City |
| Star Valley Ranch | 2 | 2,082 | 1,875 | 2.01% | 767 | 3 | Town |
| Grace | 3 | 950 | 925 | 0.53% | 953 | 1 | City |
| Bancroft | 4 | 318 | 296 | 1.27% | 522 | 1 | City |
Soda Springs is the largest city in Caribou County, with a population of 3,174.
Bancroft is the smallest city in Caribou County, with a population of 318.
There are 4 cities in Caribou County, Idaho.