Decatur, IL Profile: Facts, Map & Data


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Decatur, Illinois - Basic Facts

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The City of Decatur had a population of 72,323 as of July 1, 2018. Decatur ranks in the upper 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 Decatur is located at latitude 39.856 and longitude -88.9337 in Macon County. The formal boundaries for the City of Decatur (see map below) encompass a land area of 42.24 sq. miles and a water area of 4.68 sq. miles. Macon County is in the Central time zone (GMT -6). The elevation is 676 feet.

The City of Decatur (GNIS ID: 2394481) 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 City of Decatur is located within Township of Decatur, a minor civil division (MCD) of Macon County.

Beneath the boundary map are tables with Decatur population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2018.

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City of Decatur, IL Boundary Map

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Boundary Maps: Township of Decatur | Macon County | Illinois Counties

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


Total Population 72,323
Population in Households 68,322
Population in Familes 51,265
Population in Group Qrtrs 4,001
Population Density2 1,712
Diversity Index3 49


Median Household Income $40,783
Average Household Income $59,694
Per Capita Income $26,826


Total Housing Units 36,018 (100%)
Owner Occupied HU 19,461 (54.0%)
Renter Occupied HU 11,565 (32.1%)
Vacant Housing Units 4,992 (13.9%)
Median Home Value $84,341
Average Home Value $108,895


Total Households 31,026
Average Household Size 2.2
Family Households 17,969
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  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.


2010-2017 2017-2022
Population -0.62% -0.82%
Households -0.5% -0.73%
Families -0.67% -0.9%
Median Household Income   1.19%
Per Capita Income   2.22%

Decatur, IL - Peer Comparisons by Rank and Percentile

The table below compares Decatur 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 # 17 99th
Population Density # 373 73rd
Diversity Index # 187 86th
Median Household Income # 1181 14th
Per Capita Income # 753 45th

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

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