Marion Flag

Marion

County Seat:
Yes
Area (mi²):
44.858
State:
Illinois

Marion is located in Williamson County, Illinois. Marion has a 2025 population of 3,866. It is also the county seat of Williamson CountyMarion is currently declining at a rate of -0.1% annually and its population has decreased by -0.92% since the most recent census, which recorded a population of 3,902 in 2020.

The average household income in Marion is $117,981 with a poverty rate of 2.72%The median age in Marion is 52.2 years: 49.3 years for males, and 53.3 years for females.

3.9K
Total Population
86
Density (mi²)
-4 -0.1%
Growth

Marion Population

Demographics

Economics and Income Statistics

Sources

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