St. Clair township

County:: St. Clair County
County Seat:: No
Area (mi²):: 20.364
State:: Illinois

St. Clair township is located in St. Clair County, Illinois. St. Clair township has a 2025 population of 36,306. St. Clair township is currently growing at a rate of 0.92% annually and its population has increased by 1.69% since the most recent census, which recorded a population of 35,704 in 2020.

The average household income in St. Clair township is $100,837 with a poverty rate of 10.97%. The median age in St. Clair township is 40.9 years: 38.5 years for males, and 43.4 years for females.

Demographics

The racial composition of St. Clair township includes 65.76% White, 23.93% Black or African American, and smaller percentages for Asian, 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	23,412	65.76%
Black or African American	8,518	23.93%
Two or more races	1,859	5.22%
Asian	1,021	2.87%
Other race	638	1.79%
Native American	154	0.43%
Native Hawaiian or Pacific Islander	0	0%

St. Clair township Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

St. Clair township's average per capita income is $51,236. Household income levels show a median of $76,643. The poverty rate stands at 10.97%.

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	$125,183	-
Families	$108,474	$129,681
Households	$76,643	$100,837
Non Families	$42,108	$53,034

$51,236

Average Income

$76,643

Median Household Income

10.97%

Poverty Rate