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, Black or African American, Asian, Native Hawaiian or Pacific Islander, other race and multiracial populations.

Population by Race

White

Two or more races

Native American

Black or African American

Asian

Native Hawaiian or Pacific Islander

Other race

Race	Population	Percentage (of total)
White	1,566	89.79%
Two or more races	173	9.92%
Native American	5	0.29%
Black or African American	0	0%
Asian	0	0%
Native Hawaiian or Pacific Islander	0	0%
Other race	0	0%

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