4 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Soda Springs | 1 | 3,186 | 3,113 | 0.38% | 720 | 4 | City |
| Star Valley Ranch | 2 | 2,124 | 1,875 | 2.02% | 782 | 3 | Town |
| Grace | 3 | 955 | 925 | 0.53% | 827 | 1 | City |
| Bancroft | 4 | 323 | 296 | 1.57% | 530 | 1 | City |
Soda Springs is the largest city in Caribou County, with a population of 3,186.
Bancroft is the smallest city in Caribou County, with a population of 323.
There are 4 cities in Caribou County, Idaho.