Illiopolis is home to 890 people in Illinois. 20% of adults hold a bachelor's degree, below the 36% national rate. Home values have risen by half since 2000, reaching $100,800. 81% of homes are owner-occupied. The foreign-born share is 1%. At a median age of 43.3, this is an older place than the country as a whole.
At a glance
Lower income
median household income $63,125, below the US median
US median: $82,259
Older
median age 43.3
US median: 38.9
Less educated
20% hold a bachelor's degree
US average: 36%
More affordable
home values down 14%, inflation adjusted
US median home: $376,019
Unique to this place
What stands out about Illiopolis
What changed most since 1990
White share99.9% → 95.1%(−4.8 pts)US over the same years: −17.8 pts
Homes owned by their occupants73.5% → 81.0%(+7.4 pts)US over the same years: +0.9 pts
Median age33.4 → 43.3(+9.9 years)US over the same years: +6.0 years
Shares are "alone or in combination": a person with both Medicare and Medicaid counts in each, so categories overlap and do not sum to 100%.
Section 09 · Service history
Veterans
Veterans by period of service, 2024
Gulf War (2001 or later)41.8%(23)
US avg: 26.4%
Gulf War (1990s)16.4%(9)
US avg: 24.3%
Vietnam era29.1%(16)
US avg: 33.1%
Korean War10.9%(6)
US avg: 4.5%
World War II0%(0)
US avg: 1%
Share of the 55 veterans here. A veteran who served across eras counts in each, so shares can total more than 100%. Peacetime-only service is included in the total but not shown as an era.
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Over time
Illiopolis, decade by decade
Illiopolis population, inflation-adjusted income and home value, education, and diversity by year
Year
Population
Median household income
Median home value
Bachelor's degree+
Diversity score
1990
934
$76,848
$103,683
9.8%
0.3
2000
916
$84,601
$117,497
12.4%
2.7
2010
891
$76,125
$118,394
20.5%
5.8
2020
846
$78,025
$104,478
14.3%
15.6
2024
890
$63,125
$100,800
20.0%
12.0
Census years come from the decennial census and the latest year from the American Community Survey, so part of any change between those two rows can reflect the different surveys. Dollar figures are adjusted for inflation to 2024 dollars; a figure ending in "+" was at the Census Bureau's reporting cap that year. The diversity score runs from 0 to 100; see how it's calculated.
