10 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lakin township | 1 | 2,348 | 2,496 | -1.22% | 37 | 63.31 | Township |
| Lakin | 2 | 2,068 | 2,200 | -1.24% | 2,186 | 0.95 | City |
| Deerfield township | 3 | 832 | 872 | -0.83% | 18 | 46.12 | Township |
| Deerfield | 4 | 668 | 705 | -1.04% | 1,389 | 0.48 | City |
| Lakin township | 5 | 351 | 362 | -1.13% | 10 | 35.49 | Township |
| Southside township | 6 | 248 | 264 | -1.2% | 2 | 110.24 | Township |
| Lakin township | 7 | 242 | 245 | 0% | 4 | 66.22 | Township |
| Hartland township | 8 | 110 | 116 | -0.9% | 1 | 149.59 | Township |
| East Hibbard township | 9 | 80 | 85 | -1.23% | 1 | 155.47 | Township |
| West Hibbard township | 10 | 44 | 46 | 0% | 0.00 | 155.26 | Township |
Lakin township is the largest city in Kearny County, with a population of 2,348.
West Hibbard township is the smallest city in Kearny County.
There are 10 cities in Kearny County, Kansas.