Illiopolis township

County:: Sangamon County
County Seat:: No
Area (mi²):: 33.978
State:: Illinois

Illiopolis township is located in Sangamon County, Illinois. Illiopolis township has a 2025 population of 1,179. Illiopolis township is currently declining at a rate of -0.76% annually and its population has decreased by -2.96% since the most recent census, which recorded a population of 1,215 in 2020.

The average household income in Illiopolis township is $96,282 with a poverty rate of 5.87%.The median age in Illiopolis township is 42.6 years: 40 years for males, and 50.1 years for females.

Demographics

The racial composition of Illiopolis township includes 96.11% White, and smaller percentages for Two or more races, Black or African American, Asian and multiracial populations.

Population by Race

Race	Population	Percentage (of total)
White	1,358	96.11%
Two or more races	31	2.19%
Black or African American	19	1.34%
Asian	5	0.35%

Illiopolis township Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Illiopolis township's average per capita income is $54,946. Household income levels show a median of $88,833. The poverty rate stands at 5.87%.

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	$115,179	-
Families	$107,589	$122,181
Households	$88,833	$96,282
Non Families	$26,042	$36,840

$54,946

Average Income

$88,833

Median Household Income

5.87%

Poverty Rate