Illiopolis Flag

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 831 . Illiopolis is currently declining at a rate of -0.36% annually and its population has decreased by -1.54% 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. For every 100 females there are 116.2 males.

831
Total Population
1,227
Density (mi²)
-3 -0.36%
Growth

Illiopolis Population

Illiopolis Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of Illiopolis includes 93.56% White, and smaller percentages for Black or African American, Asian and multiracial populations.

Population by Race

White (93.56%)

Two or more races (3.63%)

Black or African American (2.22%)

Asian (0.59%)

Race
Population
Percentage (of total)
White79993.56%
Two or more races313.63%
Black or African American192.22%
Asian50.59%

Illiopolis Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

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

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)