Richland County Flag

Richland County

State:
Illinois
County Seat:
Olney

Richland County's estimated 2026 population is 15,082 with a growth rate of -0.92% in the past year according to the most recent United States census data. Richland County is the 69th largest county in Illinois. The 2010 population was 16,193 and has seen a growth of -6.86% since that time.

15,082
Total Population
42
Population Density (mi²)
69
Population Rank (State)
-140 -0.92%
Annual Population Growth

Richland County Population

Demographics

Economics and Income Statistics