9 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Grangeville | 1 | 3,809 | 3,328 | 2.59% | 2,529 | 1.51 | City |
| Cottonwood | 2 | 971 | 820 | 3.19% | 1,157 | 0.84 | City |
| Kooskia | 3 | 584 | 513 | 2.46% | 950 | 0.61 | City |
| Riggins | 4 | 419 | 373 | 2.2% | 1,053 | 0.40 | City |
| Elk City | 5 | 316 | 116 | 7.12% | 126 | 2.51 | CDP |
| Stites | 6 | 199 | 176 | 2.58% | 2,140 | 0.09 | City |
| Ferdinand | 7 | 148 | 132 | 2.07% | 846 | 0.17 | City |
| Smiths Ferry | 8 | 102 | 108 | 6.25% | 55 | 1.85 | CDP |
| White Bird | 9 | 92 | 82 | 2.22% | 1,415 | 0.07 | City |
Grangeville is the largest city in Idaho County, with a population of 3,809.
White Bird is the smallest city in Idaho County.
There are 9 cities in Idaho County, Idaho.