
Leavenworth
- County:
- Leavenworth County
- County Seat:
- Yes
- Area (mi²):
- 24.355
- State:
- Kansas
Leavenworth is a city located in Leavenworth County, Kansas. Leavenworth has a 2025 population of 36,842. It is also the county seat of Leavenworth County. Leavenworth is currently declining at a rate of -0.26% annually and its population has decreased by -1.29% since the most recent census, which recorded a population of 37,322 in 2020.
The average household income in Leavenworth is $87,328 with a poverty rate of 12.3%. The median age in Leavenworth is 35.6 years: 35.1 years for males, and 36.4 years for females.