Decatur, IL Profile: Facts & Data

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Decatur, Illinois - Basic Facts

The City of Decatur had a population of 71,919 as of July 1, 2019. 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 39.8403 and longitude -88.9548 in Macon County. The formal boundaries for the City of Decatur 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.


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  1. Decatur 2019 Demographic Data
  2. Growth Rates for Decatur (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 - 2019 Demographics

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Boundary Maps, Demographic Data, School Zones Review maps and data for the neighborhood, city, county, ZIP Code, and school zone. July 1, 2019, data includes home values, household income, percentage of homes owned, rented or vacant, etc.


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Decatur, IL Data & Demographics (As of July 1, 2019)

HOUSING AFFORDABILITY INDEX

Decatur, IL Housing Affordability Index is 203
State of Illinois Housing Affordability Index is 119
The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.

WEALTH INDEX

Decatur, IL Wealth Index is 71
State of Illinois Wealth Index is 105
The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.

These new demographic attributes are availiable for Neighborhoods, Cities, Counties, and ZIP Codes.

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  1. For information about schools and school attendance zones, use the HTL Address Tool
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  3. The new 2-Minute Introduction and Concise Guide to Big Data which will help you make the most effective use of HomeTownLocator Tools.
  4. See the References & Data Sources page for more information about methodology and sources of data.
  5. See the Illinois COVID-19 Data and US COVID-19 Data for more information on the spread of the novel coronavirus.

POPULATION

Total Population 71,919
Population in Households 67,918
Population in Families 50,581
Population in Group Qrtrs 4,001
Population Density 1,699
Diversity Index1 50
 

INCOME

Median Household Income $44,773
Average Household Income $60,912
Per Capita Income $26,160
Wealth Index3 71

HOUSING

Total Housing Units 35,507 (100%)
Owner Occupied HU 21,684 (61.1%)
Renter Occupied HU 9,199 (25.9%)
Vacant Housing Units 4,625 (13.0%)
Median Home Value $92,821
Housing Affordability Index2 203
 

HOUSEHOLDS

Total Households 30,882
Average Household Size 2.2
Family Households 17,833
Average Family Size 3
NOTES
  1. 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.
  2. The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
  3. The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.

GROWTH RATE / YEAR

2010-2019 2019-2024
Population -0.62% -0.77%
Households -0.5% -0.69%
Families -0.68% -0.87%
Median Household Income   2.25%
Per Capita Income   2.3%

Decatur, IL - Peer Comparisons by Rank and Percentile

The table below compares Decatur to the other 1,369 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2019 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 # 372 73rd
Diversity Index # 188 86th
Median Household Income # 1146 16th
Per Capita Income # 919 33rd

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

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