10 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lakin | 1 | 2,393 | 2,499 | -0.08% | 38 | 63 | Township |
| Lakin | 2 | 2,069 | 2,198 | -1% | 2,187 | 1 | City |
| Deerfield | 3 | 862 | 874 | 0.94% | 19 | 46 | Township |
| Deerfield | 4 | 677 | 709 | -0.73% | 1,407 | 0 | City |
| Lakin | 5 | 367 | 362 | 0.55% | 10 | 35 | Township |
| Southside | 6 | 253 | 262 | 0% | 2 | 110 | Township |
| Lakin | 7 | 239 | 244 | -0.42% | 4 | 66 | Township |
| Hartland | 8 | 106 | 109 | 0% | 1 | 150 | Township |
| East Hibbard | 9 | 81 | 87 | -1.22% | 1 | 155 | Township |
| West Hibbard | 10 | 43 | 45 | 0% | 0.00 | 155 | Township |
Lakin is the largest city in Kearny County, with a population of 2,393.
West Hibbard is the smallest city in Kearny County, with a population of 43.
There are 10 cities in Kearny County, Kansas.