16 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Leavenworth | 1 | 37,383 | 37,318 | 0.03% | 1,535 | 24 | City |
| Fairmount | 2 | 12,905 | 11,317 | 2.62% | 329 | 39 | Township |
| Lansing | 3 | 11,336 | 11,235 | 0.18% | 922 | 12 | City |
| Basehor | 4 | 8,261 | 6,933 | 3.31% | 1,156 | 7 | City |
| Tonganoxie | 5 | 6,522 | 5,970 | 1.26% | 123 | 53 | Township |
| Tonganoxie | 6 | 6,346 | 5,590 | 2.44% | 1,564 | 4 | City |
| Stranger | 7 | 5,559 | 5,102 | 1.37% | 114 | 49 | Township |
| Sherman | 8 | 2,948 | 2,797 | 1.24% | 71 | 41 | Township |
| High Prairie | 9 | 2,157 | 2,037 | 1.36% | 46 | 47 | Township |
| Kickapoo | 10 | 1,887 | 1,782 | 1.45% | 43 | 44 | Township |
| Reno | 11 | 1,500 | 1,416 | 1.49% | 35 | 43 | Township |
| Delaware | 12 | 1,132 | 1,072 | 1.34% | 57 | 20 | Township |
| Easton | 13 | 1,111 | 1,058 | 1.28% | 26 | 42 | Township |
| Alexandria | 14 | 894 | 850 | 1.13% | 19 | 48 | Township |
| Linwood | 15 | 431 | 415 | 0.7% | 731 | 1 | City |
| Easton | 16 | 213 | 211 | 0% | 1,260 | 0 | City |
Leavenworth is the largest city in Leavenworth County, with a population of 37,383.
Easton is the smallest city in Leavenworth County, with a population of 213.
There are 16 cities in Leavenworth County, Kansas.