Illiopolis

County:: Sangamon County
County Seat:: No
Area (mi²):: 0.677
State:: Illinois

Illiopolis is a village located in Sangamon County, Illinois. Illiopolis has a 2025 population of 822. Illiopolis is currently declining at a rate of -0.48% annually and its population has decreased by -2.61% since the most recent census, which recorded a population of 844 in 2020.

The average household income in Illiopolis is $77,651 with a poverty rate of 4.33%. The median age in Illiopolis is 45.5 years: 40 years for males, and 50.1 years for females.

Demographics

The racial composition of Illiopolis includes 93.56% White, and smaller percentages for Black or African American, Asian, Native American, Native Hawaiian or Pacific Islander, other race and multiracial populations.

Population by Race

White

Two or more races

Black or African American

Asian

Native American

Native Hawaiian or Pacific Islander

Other race

Race	Population	Percentage (of total)
White	799	93.56%
Two or more races	31	3.63%
Black or African American	19	2.22%
Asian	5	0.59%
Native American	0	0%
Native Hawaiian or Pacific Islander	0	0%
Other race	0	0%

Illiopolis Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Illiopolis' average per capita income is $44,375. Household income levels show a median of $74,219. The poverty rate stands at 4.33%.

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	$101,667	-
Families	$91,750	$93,374
Households	$74,219	$77,651
Non Families	$39,688	$42,751

$44,375

Average Income

$74,219

Median Household Income

4.33%

Poverty Rate