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 2026 population of 829. Illiopolis is currently declining at a rate of -0.24% annually and its population has decreased by -1.78% since the most recent census, which recorded a population of 844 in 2020.

The median household income in Illiopolis is $63,125 with a poverty rate of 5.98%. The median age in Illiopolis is 43.3 years: 40.1 years for males, and 45.9 years for females. For every 100 females there are 117.6 males.

829
Total Population
1,224
Density (mi²)
-2 -0.24%
Growth

Illiopolis Population

Illiopolis Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
2026829-2-0.24%
2025831-3-0.36%
202483400%
2023834-5-0.6%
202283930.36%
2021836-8-0.95%
2020844-1-0.12%
2019844-9-1.06%
2018853-10-1.16%
2017863-8-0.92%
2016871-8-0.91%
2015879-7-0.79%
2014886-5-0.56%
2013891-5-0.56%
201289610.11%
201189540.45%
201089210.11%

Median Age

Overall: 43.3 years
Female: 45.9 years
Male: 40.1 years

Illiopolis Adults

There are 678 adults, (172 of whom are seniors) in Illiopolis.

Sex Ratio

Female: 409 (46%)
Male: 481 (54%)

Demographics

The racial composition of Illiopolis includes 95.06% 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)
White84695.06%
Two or more races192.13%
Black or African American182.02%
Asian70.79%
Race
Population ↓
Percentage (of total)
Two or more races60.67%
Race
Population ↓
Percentage (of total)
White84695.06%
Black or African American182.02%
Two or more races131.46%
Asian70.79%

Illiopolis Marital Status

Economics and Income Statistics

Illiopolis ' average per capita income is $44,205. Household income levels show a median of $63,125. The poverty rate stands at 5.98%.

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$92,656-
Families$83,750$88,657
Households$63,125$74,555
Non Families$29,722$37,330

$44,205

Average Income

$63,125

Median Household Income

5.98%

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)