| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Sedan | 1 | 974 | 999 | -0.2% | 1,185 | 1 | City |
| Cedar Vale | 2 | 465 | 478 | -0.21% | 617 | 1 | City |
| Chautauqua | 3 | 108 | 111 | -0.92% | 255 | 0 | City |
| Peru | 4 | 101 | 102 | 0% | 312 | 0 | City |
| Niotaze | 5 | 83 | 86 | -1.19% | 224 | 0 | City |
| Elgin | 6 | 57 | 58 | 0% | 292 | 0 | City |
Sedan is the largest city in Chautauqua County, with a population of 974.
Elgin is the smallest city in Chautauqua County, with a population of 57.
There are 6 cities in Chautauqua County, Kansas.