
Leavenworth County
- State:
- Kansas
- County Seat:
- Leavenworth
Leavenworth County's estimated 2025 population is 84,710 with a growth rate of 0.71% in the past year according to the most recent United States census data. Leavenworth County is the 6th largest county in Kansas. The 2010 population was 76,536 and has seen a growth of 10.68% since that time.