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 and multiracial populations.

Population by Race

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%

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