Fayette County Flag

Fayette County

State:
Illinois
County Seat:
Vandalia

Fayette County's estimated 2025 population is 20,952 with a growth rate of -0.5% in the past year according to the most recent United States census data. Fayette County is the 54th largest county in Illinois. The 2010 population was 22,140 and has seen a growth of -5.37% since that time.

20,952
Total Population
29
Population Density (mi²)
54
Population Rank (State)
-106 -0.5%
Annual Population Growth

Fayette County Population

Demographics

Economics and Income Statistics