
Clay County
- State:
- Kansas
- County Seat:
- Clay Center
Clay County's estimated 2025 population is 7,939 with a growth rate of -0.43% in the past year according to the most recent United States census data. Clay County is the 47th largest county in Kansas. The 2010 population was 8,544 and has seen a growth of -7.08% since that time.