5 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Kamiah | 1 | 1,231 | 1,118 | 1.9% | 1,121 | 1.10 | City |
| Nezperce | 2 | 498 | 458 | 1.63% | 761 | 0.65 | City |
| Craigmont | 3 | 496 | 460 | 1.43% | 638 | 0.78 | City |
| Winchester | 4 | 382 | 354 | 1.6% | 2,170 | 0.18 | City |
| Reubens | 5 | 46 | 41 | 2.22% | 272 | 0.17 | City |
Kamiah is the largest city in Lewis County, with a population of 1,231.
Reubens is the smallest city in Lewis County.
There are 5 cities in Lewis County, Idaho.