
Adair County
- State:
- Missouri
- County Seat:
- Kirksville
Adair County's estimated 2025 population is 25,064 with a growth rate of -0.12% in the past year according to the most recent United States census data. Adair County is the 43rd largest county in Missouri. The 2010 population was 25,638 and has seen a growth of -2.24% since that time.