5 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Kamiah | 1 | 1,186 | 1,117 | 1.02% | 1,080 | 1 | City |
| Craigmont | 2 | 485 | 460 | 0.83% | 624 | 1 | City |
| Nezperce | 3 | 485 | 455 | 1.04% | 742 | 1 | City |
| Winchester | 4 | 373 | 352 | 1.08% | 2,119 | 0 | City |
| Reubens | 5 | 50 | 44 | 2.04% | 296 | 0 | City |
Kamiah is the largest city in Lewis County, with a population of 1,186.
Reubens is the smallest city in Lewis County, with a population of 50.
There are 5 cities in Lewis County, Idaho.