| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Pocatello | 1 | 59,205 | 56,863 | 0.74% | 1,702 | 35 | City |
| Chubbuck | 2 | 17,049 | 15,677 | 1.34% | 2,417 | 7 | City |
| Inkom | 3 | 873 | 803 | 1.28% | 913 | 1 | City |
| McCammon | 4 | 826 | 827 | -0.24% | 371 | 2 | City |
| Downey | 5 | 586 | 565 | 0.51% | 602 | 1 | City |
| Lava Hot Springs | 6 | 378 | 359 | 1.07% | 549 | 1 | City |
| Arimo | 7 | 364 | 354 | 0.55% | 811 | 0 | City |
Pocatello is the largest city in Bannock County, with a population of 59,205.
Arimo is the smallest city in Bannock County, with a population of 364.
There are 7 cities in Bannock County, Idaho.