Adams County Flag

Adams County

State:
Illinois
County Seat:
Quincy

Adams County's estimated 2026 population is 63,457 with a growth rate of -0.51% in the past year according to the most recent United States census data. Adams County is the 23rd largest county in Illinois. The 2010 population was 67,158 and has seen a growth of -5.51% since that time.

63,457
Total Population
74
Population Density (mi²)
23
Population Rank (State)
-326 -0.51%
Annual Population Growth

Adams County Population

Demographics

Economics and Income Statistics