Allen County Flag

Allen County

State:
Kansas
County Seat:
Iola

Allen County's estimated 2025 population is 12,258 with a growth rate of -0.62% in the past year according to the most recent United States census data. Allen County is the 36th largest county in Kansas. The 2010 population was 13,363 and has seen a growth of -8.27% since that time.

12,258
Total Population
25
Population Density (mi²)
36
Population Rank (State)
-77 -0.62%
Annual Population Growth

Allen County Population

Demographics

Economics and Income Statistics