20 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lakin | 1 | 2,395 | 2,510 | -0.08% | 38 | 63 | Township |
| Lakin | 2 | 2,395 | 2,499 | -0.08% | 38 | 63 | Township |
| Lakin | 3 | 2,090 | 2,207 | -1.04% | 2,209 | 1 | City |
| Lakin | 4 | 2,090 | 2,198 | -1.04% | 2,209 | 1 | City |
| Deerfield | 5 | 854 | 879 | 0.95% | 19 | 46 | Township |
| Deerfield | 6 | 854 | 874 | 0.95% | 19 | 46 | Township |
| Deerfield | 7 | 682 | 713 | -0.87% | 1,418 | 0 | City |
| Deerfield | 8 | 682 | 709 | -0.87% | 1,418 | 0 | City |
| Lakin | 9 | 365 | 363 | 0.55% | 10 | 35 | Township |
| Lakin | 10 | 365 | 362 | 0.55% | 10 | 35 | Township |
| Southside | 11 | 253 | 264 | 0% | 2 | 110 | Township |
| Southside | 12 | 253 | 262 | 0% | 2 | 110 | Township |
| Lakin | 13 | 240 | 245 | -0.41% | 4 | 66 | Township |
| Lakin | 14 | 240 | 244 | -0.41% | 4 | 66 | Township |
| Hartland | 15 | 106 | 110 | 0% | 1 | 150 | Township |
| Hartland | 16 | 106 | 109 | 0% | 1 | 150 | Township |
| East Hibbard | 17 | 82 | 88 | -1.2% | 1 | 155 | Township |
| East Hibbard | 18 | 82 | 87 | -1.2% | 1 | 155 | Township |
| West Hibbard | 19 | 43 | 45 | 0% | 0.00 | 155 | Township |
| West Hibbard | 20 | 43 | 45 | 0% | 0.00 | 155 | Township |
Lakin is the largest city in Kearny County, with a population of 2,395.
West Hibbard is the smallest city in Kearny County, with a population of 43.
There are 20 cities in Kearny County, Kansas.