Oak Forest, IL Profile: Facts, Map & Data


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Oak Forest, Illinois - Basic Facts

The City of Oak Forest had a population of 27,327 as of July 1, 2018. Oak Forest ranks in the upper quartile for Population Density and 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 Oak Forest is located at latitude 41.607 and longitude -87.7535 in Cook County. The formal boundaries for the City of Oak Forest (see map below) encompass a land area of 5.95 sq. miles and a water area of 0.05 sq. miles. Cook County is in the Central time zone (GMT -6). The elevation is 673 feet.

The City of Oak Forest (GNIS ID: 2395281) 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 Oak Forest is located within Township of Bremen, a minor civil division (MCD) of Cook County.

Beneath the boundary map are tables with Oak Forest 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 Oak Forest, IL Boundary Map

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Boundary Maps: Township of Bremen | Cook County | Illinois Counties

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


Total Population 27,327
Population in Households 27,283
Population in Familes 23,587
Population in Group Qrtrs 44
Population Density2 4,593
Diversity Index3 51


Median Household Income $78,214
Average Household Income $87,799
Per Capita Income $32,194


Total Housing Units 10,695 (100%)
Owner Occupied HU 8,042 (75.2%)
Renter Occupied HU 1,975 (18.5%)
Vacant Housing Units 678 ( 6.3%)
Median Home Value $213,046
Average Home Value $224,189


Total Households 10,017
Average Household Size 2.72
Family Households 7,210
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 -0.28% -0.26%
Households -0.23% -0.26%
Families -0.28% -0.28%
Median Household Income   0.95%
Per Capita Income   1.86%

Oak Forest, IL - Peer Comparisons by Rank and Percentile

The table below compares Oak Forest 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 # 78 94th
Population Density # 54 96th
Diversity Index # 182 87th
Median Household Income # 209 85th
Per Capita Income # 375 73rd

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

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