Richland County Flag

Richland County

State:
Illinois
County Seat:
Olney

Richland County's estimated 2025 population is 15,222 with a growth rate of -0.91% 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% since that time.

15,222
Total Population
42
Population Density (mi²)
69
Population Rank (State)
-140 -0.91%
Annual Population Growth

Richland County Population

Demographics

Economics and Income Statistics

Sources

  1. City and Town Population Totals: 2020-2024
  2. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  3. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  4. American Community Survey (2009 - 2013)
  5. Census QuickFacts
  6. Historical Populations of States and Counties (1790 - 1990)