Marissa township

County:: St. Clair County
County Seat:: No
Area (mi²):: 34.449
State:: Illinois

Marissa township is located in St. Clair County, Illinois. Marissa township has a 2025 population of 2,119. Marissa township is currently declining at a rate of -1.26% annually and its population has decreased by -6.4% since the most recent census, which recorded a population of 2,264 in 2020.

The average household income in Marissa township is $66,481 with a poverty rate of 15.23%.The median age in Marissa township is 45.6 years: 49.7 years for males, and 40.6 years for females.

Demographics

The racial composition of Marissa township includes 89.79% White, and smaller percentages for Native American and multiracial populations.

Population by Race

Race	Population	Percentage (of total)
White	1,566	89.79%
Two or more races	173	9.92%
Native American	5	0.29%

Marissa township Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Marissa township's average per capita income is $38,594. Household income levels show a median of $52,217. The poverty rate stands at 15.23%.

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	$87,321	-
Families	$73,850	$83,001
Households	$52,217	$66,481
Non Families	$22,359	$41,909

$38,594

Average Income

$52,217

Median Household Income

15.23%

Poverty Rate