Marion Flag

Marion

County Seat:
Yes
Area (mi²):
14.403
State:
Illinois

Marion is a city located in Williamson County, Illinois. Marion has a 2025 population of 17,068 . It is also the county seat of Williamson County . Marion is currently growing at a rate of 0.28% annually and its population has increased by 1.41% since the most recent census, which recorded a population of 16,831 in 2020.

The average household income in Marion is $78,411 with a poverty rate of 15.97%. The median age in Marion is 40.4 years: 39.5 years for males, and 41.3 years for females. For every 100 females there are 91.5 males.

17.1K
Total Population
1,185
Density (mi²)
47 0.28%
Growth

Marion Population

Marion Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of Marion includes 86.22% White, 5.23% Black or African American, 3.14% Asian, and smaller percentages for other race, Native American and multiracial populations.

Population by Race

White (86.22%)

Black or African American (5.23%)

Two or more races (5.04%)

Asian (3.14%)

Other race (0.2%)

Native American (0.17%)

Race
Population
Percentage (of total)
White14,48286.22%
Black or African American8795.23%
Two or more races8465.04%
Asian5273.14%
Other race330.2%
Native American290.17%

Marion Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Marion's average per capita income is $47,616. Household income levels show a median of $57,281. The poverty rate stands at 15.97%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.
Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.
Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.
Name
Median
Mean
Married Families$106,392-
Families$78,851$100,593
Households$57,281$78,411
Non Families$33,900$50,209

$47,616

Average Income

$57,281

Median Household Income

15.97%

Poverty Rate

Nearby Cities

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)