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 and multiracial populations.

Population by Race

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%

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