| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Kamiah | 1 | 1,143 | 1,117 | 0.79% | 1,041 | 1 | City |
| Nezperce | 2 | 475 | 458 | 0.85% | 726 | 1 | City |
| Craigmont | 3 | 472 | 460 | 0.64% | 607 | 1 | City |
| Winchester | 4 | 366 | 355 | 0.83% | 2,080 | 0 | City |
| Reubens | 5 | 53 | 47 | 1.92% | 314 | 0 | City |
Kamiah is the largest city in Lewis County, with a population of 1,143.
Reubens is the smallest city in Lewis County, with a population of 53.
There are 5 cities in Lewis County, Idaho.