5 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Kamiah | 1 | 1,174 | 1,117 | 0.95% | 1,069 | 1 | City |
| Craigmont | 2 | 481 | 460 | 0.84% | 619 | 1 | City |
| Nezperce | 3 | 480 | 455 | 1.05% | 734 | 1 | City |
| Winchester | 4 | 369 | 352 | 0.82% | 2,097 | 0 | City |
| Reubens | 5 | 49 | 44 | 2.08% | 290 | 0 | City |
Kamiah is the largest city in Lewis County, with a population of 1,174.
Reubens is the smallest city in Lewis County, with a population of 49.
There are 5 cities in Lewis County, Idaho.