Illiopolis, IL Profile: Facts & Data


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Illiopolis, Illinois - Basic Facts

The Village of Illiopolis had a population of 862 as of July 1, 2018. 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 39.8537 and longitude -89.242 in Sangamon County. The formal boundaries for the Village of Illiopolis 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.

Alternate Unofficial Names for Illiopolis: Wilson.

Jump to... (On This Page!)
  1. Illiopolis 2018 Demographic Data
  2. Growth Rates for Illiopolis (Historical & 5-Year Forecast)
  3. Peer Comparisons (Rank and Percentile)
  1. Neighborhoods Demographics (Home Values, Household Income, etc.)
  2. Illinois Research Tools (Easy Tools & Current Data)
  3. Illinois Data Comparison Tool - 2018 Demographics

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Illiopolis, IL Data & Demographics (As of July 1, 2018)


Total Population 862
Population in Households 862
Population in Familes 731
Population in Group Qrtrs 0
Population Density2 1,881
Diversity Index3 6


Median Household Income $54,470
Average Household Income $64,519
Per Capita Income $25,161


Total Housing Units 390 (100%)
Owner Occupied HU 259 (66.4%)
Renter Occupied HU 73 (18.7%)
Vacant Housing Units 58 (14.9%)
Median Home Value $82,822
Average Home Value $123,062


Total Households 332
Average Household Size 2.6
Family Households 234
Average Family Size 3
  1. Demographics are point estimates for July 1st of the current year and each for the forecast years. See References for more information.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood 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.


2010-2018 2018-2023
Population -0.4% -0.35%
Households -0.36% -0.3%
Families -0.51% -0.43%
Median Household Income   1.51%
Per Capita Income   2.75%

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, 2018 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 # 746 46th
Population Density # 309 77th
Diversity Index # 1173 14th
Median Household Income # 694 49th
Per Capita Income # 915 33rd

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

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