Illiopolis Flag

Illiopolis

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

Illiopolis is located in Sangamon County, Illinois. Illiopolis has a 2025 population of 1,206 . Illiopolis is currently growing at a rate of 0.17% annually but its population has decreased by -0.74% since the most recent census, which recorded a population of 1,215 in 2020.

The average household income in Illiopolis is $96,282 with a poverty rate of 5.87%. The median age in Illiopolis is 42.6 years: 40 years for males, and 50.1 years for females. For every 100 females there are 103.6 males.

1.2K
Total Population
35
Density (mi²)
2 0.17%
Growth

Illiopolis Population

Illiopolis Population

Data after 2023 is projected based on recent change

Demographics

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

Population by Race

White (96.11%)

Two or more races (2.19%)

Black or African American (1.34%)

Asian (0.35%)

Race
Population
Percentage (of total)
White1,35896.11%
Two or more races312.19%
Black or African American191.34%
Asian50.35%

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 $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

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)