Illiopolis township Flag

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 2026 population of 1,208. Illiopolis township is currently growing at a rate of 0.17% annually but its population has decreased by -0.58% since the most recent census, which recorded a population of 1,215 in 2020.

The median household income in Illiopolis township is $83,000 with a poverty rate of 6.8%. The median age in Illiopolis township is 42.6 years: 41.2 years for males, and 48.7 years for females. For every 100 females there are 103.3 males.

1.2K
Total Population
36
Density (mi²)
2 0.17%
Growth

Illiopolis township Population

Illiopolis township Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
20261,20820.17%
20251,20620.17%
20241,20420.17%
20231,202-6-0.5%
20221,20810.08%
20211,207-8-0.66%
20201,215-2-0.16%
20191,252-13-1.03%
20181,265-14-1.09%
20171,279-11-0.85%
20161,290-11-0.85%
20151,301-9-0.69%
20141,310-4-0.3%
20131,314-6-0.45%
20121,32000%
20111,32060.46%
20101,31510.08%

Median Age

Overall: 42.6 years
Female: 48.7 years
Male: 41.2 years

Illiopolis township Adults

There are 1,115 adults, (373 of whom are seniors) in Illiopolis township.

Sex Ratio

Female: 732 (49.2%)
Male: 756 (50.8%)

Demographics

The racial composition of Illiopolis township includes 97.04% 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)
White1,44497.04%
Two or more races191.28%
Black or African American181.21%
Asian70.47%
Race
Population ↓
Percentage (of total)
Two or more races60.4%
Race
Population ↓
Percentage (of total)
White1,44497.04%
Black or African American181.21%
Two or more races130.87%
Asian70.47%

Illiopolis township Marital Status

Economics and Income Statistics

Illiopolis township 's average per capita income is $60,550. Household income levels show a median of $83,000. The poverty rate stands at 6.8%.

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$118,333-
Families$109,904$123,209
Households$83,000$97,663
Non Families-$36,744

$60,550

Average Income

$83,000

Median Household Income

6.8%

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)