Belleville

County:: St. Clair County
County Seat:: Yes
Area (mi²):: 23.233
State:: Illinois

Belleville is located in St. Clair County, Illinois. Belleville has a 2025 population of 39,722. It is also the county seat of St. Clair County. Belleville is currently declining at a rate of -1.25% annually and its population has decreased by -6.02% since the most recent census, which recorded a population of 42,266 in 2020.

The average household income in Belleville is $77,293 with a poverty rate of 14.88%. The median age in Belleville is 38.3 years: 38.2 years for males, and 38.5 years for females.

Demographics

The racial composition of Belleville includes 57.77% White, 32.03% Black or African American, and smaller percentages for other race, Asian, Native Hawaiian or Pacific Islander, Native American and multiracial populations.

Population by Race

White

Black or African American

Two or more races

Other race

Asian

Native Hawaiian or Pacific Islander

Native American

Race	Population	Percentage (of total)
White	24,103	57.77%
Black or African American	13,364	32.03%
Two or more races	3,172	7.6%
Other race	612	1.47%
Asian	367	0.88%
Native Hawaiian or Pacific Islander	65	0.16%
Native American	39	0.09%

Belleville Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Belleville's average per capita income is $42,111. Household income levels show a median of $60,529. The poverty rate stands at 14.88%.

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	$101,728	-
Families	$81,264	$95,792
Households	$60,529	$77,293
Non Families	$37,344	$52,271

$42,111

Average Income

$60,529

Median Household Income

14.88%

Poverty Rate