6 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Sedan | 1 | 978 | 999 | -0.31% | 1,190 | 1 | City |
| Cedar Vale | 2 | 471 | 480 | -0.21% | 625 | 1 | City |
| Chautauqua | 3 | 109 | 111 | 0% | 257 | 0 | City |
| Peru | 4 | 100 | 102 | 0% | 309 | 0 | City |
| Niotaze | 5 | 88 | 90 | 0% | 238 | 0 | City |
| Elgin | 6 | 55 | 57 | 0% | 282 | 0 | City |
Sedan is the largest city in Chautauqua County, with a population of 978.
Elgin is the smallest city in Chautauqua County, with a population of 55.
There are 6 cities in Chautauqua County, Kansas.