16 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Leavenworth | 1 | 37,396 | 37,318 | 0.03% | 1,535 | 24 | City |
| Fairmount | 2 | 13,234 | 11,317 | 2.55% | 337 | 39 | Township |
| Lansing | 3 | 11,356 | 11,235 | 0.18% | 923 | 12 | City |
| Basehor | 4 | 8,527 | 6,933 | 3.22% | 1,194 | 7 | City |
| Tonganoxie | 5 | 6,603 | 5,970 | 1.24% | 124 | 53 | Township |
| Tonganoxie | 6 | 6,497 | 5,590 | 2.38% | 1,601 | 4 | City |
| Stranger | 7 | 5,634 | 5,102 | 1.35% | 115 | 49 | Township |
| Sherman | 8 | 2,984 | 2,797 | 1.22% | 72 | 41 | Township |
| High Prairie | 9 | 2,186 | 2,037 | 1.34% | 46 | 47 | Township |
| Kickapoo | 10 | 1,914 | 1,782 | 1.43% | 43 | 44 | Township |
| Reno | 11 | 1,522 | 1,416 | 1.47% | 36 | 43 | Township |
| Delaware | 12 | 1,147 | 1,072 | 1.33% | 58 | 20 | Township |
| Easton | 13 | 1,125 | 1,058 | 1.26% | 27 | 42 | Township |
| Alexandria | 14 | 904 | 850 | 1.12% | 19 | 48 | Township |
| Linwood | 15 | 434 | 415 | 0.7% | 736 | 1 | City |
| Easton | 16 | 214 | 211 | 0.47% | 1,266 | 0 | City |
Leavenworth is the largest city in Leavenworth County, with a population of 37,396.
Easton is the smallest city in Leavenworth County, with a population of 214.
There are 16 cities in Leavenworth County, Kansas.