7 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Grangeville | 1 | 3,776 | 3,328 | 2.03% | 2,507 | 2 | City |
| Cottonwood | 2 | 971 | 821 | 2.64% | 1,157 | 1 | City |
| Kooskia | 3 | 577 | 513 | 1.94% | 938 | 1 | City |
| Riggins | 4 | 407 | 367 | 1.75% | 1,023 | 0 | City |
| Stites | 5 | 194 | 173 | 2.11% | 2,086 | 0 | City |
| Ferdinand | 6 | 144 | 129 | 2.13% | 823 | 0 | City |
| White Bird | 7 | 90 | 81 | 2.27% | 1,385 | 0 | City |
Grangeville is the largest city in Idaho County, with a population of 3,776.
White Bird is the smallest city in Idaho County, with a population of 90.
There are 7 cities in Idaho County, Idaho.