Illiopolis, IL Profile: Facts, Map & Data


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Illiopolis, Illinois - Basic Facts

The Village of Illiopolis had a population of 879 as of July 1, 2016. Illiopolis ranks in the upper quartile for Population Density and the lower quartile for Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Illinois. See peer rankings below.

The primary coordinate point for Illiopolis is located at latitude 39.8514 and longitude -89.2477 in Sangamon County. The formal boundaries for the Village of Illiopolis (see map below) encompass a land area of 0.46 sq. miles and a water area of 0 sq. miles. Sangamon County is in the Central time zone (GMT -6). The elevation is 604 feet.

The Village of Illiopolis (GNIS ID: 2398568) has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

The Village of Illiopolis is located within Township of Illiopolis, a minor civil division (MCD) of Sangamon County.

Beneath the boundary map are tables with Illiopolis population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2016.

Alternate Unofficial Names for Illiopolis: Wilson.

Neighborhood Data

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Village of Illiopolis, IL Boundary Map

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Boundary Maps: Township of Illiopolis | Sangamon County | Illinois Counties

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Illiopolis, IL Data & Demographics (As of July 1, 2016)


Total Population 879
Population in Households 879
Population in Familes 743
Population in Group Qrtrs 0
Population Density1 1,918
Diversity Index2 6


Total Households 338
Average Household Size 2.6
Family Households 239
Average Family Size 3


Total Housing Units 384 (100%)
Owner Occupied HU 245 (63.8%)
Renter Occupied HU 93 (24.2%)
Vacant Housing Units 46 (12.0%)
Median Home Value $79,739
Average Home Value $120,902


Median Household Income $51,753
Average Household Income $59,534
Per Capita Income $23,246
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population -0.22% -0.05%
Households -0.19% 0.0%
Families -0.33% -0.17%
Median Household Income   0.01%
Per Capita Income   0.79%
1) Population Density = Total Population per square mile.
2) The Diversity Index is a scale of 0 to 100 that represents the likelyhood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.
Based on Census 2010 counts, the Diversity Index for the United States was 60.6 and it is expected to increase to 64.8 by July 1, 2018.

Illiopolis, IL - Peer Comparisons by Rank and Percentile

The table below compares Illiopolis to the other 1,368 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2016 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 753 45th
Population Density1 # 301 78th
Diversity Index2 # 1194 13th
Median Household Income # 707 48th
Per Capita Income # 938 32nd

Additional comparisons and rankings can be made with a VERY EASY TO USE Illinois Census Data Comparison Tool.

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