Marion

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

Marion is a city located in Williamson County, Illinois. Marion has a 2025 population of 16,860. It is also the county seat of Williamson County. Marion is currently growing at a rate of 0.02% annually and its population has increased by 0.12% since the most recent census, which recorded a population of 16,840 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.

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, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

White

Black or African American

Two or more races

Asian

Other race

Native American

Native Hawaiian or Pacific Islander

Race	Population	Percentage (of total)
White	14,482	86.22%
Black or African American	879	5.23%
Two or more races	846	5.04%
Asian	527	3.14%
Other race	33	0.2%
Native American	29	0.17%
Native Hawaiian or Pacific Islander	0	0%

Marion Marital Status

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