Oak Brook, Illinois Population 2021

7,918
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Oak Brook is a city located in Illinois. With a 2020 population of 7,918, it is the 257th largest city in Illinois and the 3658th largest city in the United States . Oak Brook is currently declining at a rate of -0.62% annually but its population has increased by 0.44% since the most recent census, which recorded a population of 7,883 in 2010. Oak Brook reached it's highest population of 9,178 in 1990. Spanning over 8 miles, Oak Brook has a population density of 994 people per square mile.

The average household income in Oak Brook is $236,686 with a poverty rate of 4.86%. The median rental costs in recent years comes to - per month, and the median house value is $801,100. The median age in Oak Brook is 56.1 years, 54.8 years for males, and 56.7 years for females.

Oak Brook Demographics

According to the most recent ACS, the racial composition of Oak Brook was:

  • White: 62.35%
  • Asian: 31.79%
  • Two or more races: 2.80%
  • Black or African American: 2.41%
  • Other race: 0.64%
  • Native American: 0.00%
  • Native Hawaiian or Pacific Islander: 0.00%
The current population of Oak Brook, Illinois is 7,918 based on our projections of the latest US Census estimates. The US Census estimates the 2018 population at 8,065.The last official US Census in 2010 recorded the population at 7,883.

Oak Brook, Illinois Population 2021

Population by Race

Race Population Percentage
White5,03562.35%
Asian2,56731.79%
Two or More Races2262.80%
Black or African American1952.41%
Some Other Race520.64%
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Oak Brook Population by Race

Oak Brook Population Pyramid $2021

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Oak Brook Median Age

56.1


Total

54.8


Male

56.7


Female

Oak Brook Adults

There are 6,572 adults, (3,112 of whom are seniors) in Oak Brook.

Oak Brook Age Dependency

133.4

Age Dependency Ratio

89.9

Old Age Dependency Ratio

43.4

Child Dependency Ratio

Oak Brook Sex Ratio

Female

4,301

53.26%

Male

3,774

46.74%

Oak Brook Population by Age

Oak Brook Renter vs Owner Occupied by Household Type

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Oak Brook Household Types

Type Owner Renter
Female100%0%
Non Family98.6%1.4%
All95.9%4.1%
Married95.1%4.9%
Male81.5%18.5%

95.9%

Rate of Home Ownership

Oak Brook Households and Families

Type Count Average Size Owned
All3,0392.6295.9
Married2,0773.0995.1
Non Family7231.0298.6
Female1743.74100
Male652.2681.5

3.1

Average Family Size

2.62

Average Household Size

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Oak Brook Households by Type

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Education Attained Count Percentage
Less Than 9th Grade811.30%
9th to 12th Grade801.28%
High School Graduate80212.87%
Some College80212.87%
Associates Degree3175.09%
Bachelors Degree1,93931.12%
Graduate Degree2,21035.47%
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Oak Brook Educational Attainment by Sex (over 25)

Oak Brook Educational Attainment by Race

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Race Total High School Bachelors
White3,9883,8692,327
Asian1,7191,7101,553
Hispanic20917693
2+ Races179179120
Black14314346
Other Race525240

The highest rate of high school graduation is among black people with a rate of 100.00%.

The highest rate of bachelors degrees is among asian people with a rate of 90.34%.

Oak Brook Educational Attainment by Race

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Name Average Male Female
Overall$95,714$124,844$60,156
Less Than 9th Grade$$$
High School Graduate$50,417$$39,412
Some College$48,112$100,938$26,652
Bachelors Degree$83,101$97,250$72,153
Graduate Degree$157,652$159,517$114,219

$95,714

Average Earnings

$124,844

Average Male

$60,156

Average Female

Oak Brook Earnings by Educational Attainment

Oak Brook Language by Age

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Oak Brook Language

63.15% of Oak Brook residents speak only English, while 36.85% speak other languages. The non-English language spoken by the largest group is Other Indo-European, which is spoken by 20.83% of the population.

Oak Brook Language

Oak Brook Poverty by Race

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Name Total In Poverty Poverty Rate
White4,6892856.08%
Asian2,5601013.95%

4.86%

Overall Poverty Rate

4.90%

Male Poverty Rate

4.82%

Female Poverty Rate

Poverty in Oak Brook

The race most likely to be in poverty in Oak Brook is White, with 6.08% below the poverty level.

The race least likely to be in poverty in Oak Brook is Asian, with 3.95% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 0.37%. Among those working part-time, it was 0.62%, and for those that did not work, the poverty rate was 8.49%.

Oak Brook Poverty

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Name Poverty
Less Than 9th Grade6.94%
Bachelors or Greater4.69%
Some College1.53%
High School1.39%

Oak Brook Poverty Rate by Education

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Rate Poverty
Female Employed1.17%
Female Unemployed0.00%
Male Unemployed0.00%
Male Employed0.00%

Oak Brook Poverty Rate by Employment Status and Sex

Oak Brook Income by Household Type

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Name Median Mean
Households$141,055$236,686
Families$190,625$282,295
Married Families$201,528-
Non Families$56,776$89,775
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Income by Household Type

Oak Brook Marital Status

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Marriage Rates

65.9%

Overall Marriage Rate

69.3%

Male Marriage Rate

62.9%

Female Marriage Rate

Oak Brook Married by Age and Sex

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Oak Brook Marriage

The age group where males are most likely to be married is Over 65, while the female age group most likely to be married is 35-44.

Oak Brook Marital Status by Race

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Oak Brook Marital Status

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387

Number of Veterans

368

Male Veterans

19

Female Veterans

War Veterans
Vietnam150
Korea91
World War II44
First Gulf War
Second Gulf War

Oak Brook Veterans by War

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Age Group Veterans
75+241
65 to 74127
55 to 6419
35 to 54
18 to 34

Oak Brook Veterans by Age

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Name Veterans % of Total
White3688.65%
Asian190.99%
Hispanic135.12%

Oak Brook Veterans by Race

Oak Brook Veterans by Education

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2.13%

Veteran Poverty Rate

18.67%

Veteran Disability Rate

Oak Brook Veterans by Education

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45.1%

Labor Force Participation

43.6%

Employment Rate

3.4%

Unemployment Rate

Oak Brook Employment by Age

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Oak Brook Employment by Race

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Oak Brook Employment by Education

Origin of Non-Citizens

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Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.

Origin of Naturalized Citizens

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58.97%

Born in Oak Brook

71.06%

Native Born

28.94%

Foreign Born

3.65%

Non Citizen

25.29%

Naturalized

Place of Birth

71.06% of Oak Brook residents were born in the United States, with 58.97% having been born in Illinois. 3.65% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

Oak Brook Place of Birth

Year Population Growth Annual Growth Rate
20217,918-49-0.62%
20207,967-49-0.61%
20198,016-49-0.61%
20188,065-16-0.20%
20178,081-6-0.07%
20168,087-5-0.06%
20158,092220.27%
20148,070320.40%
20138,038430.54%
20127,995330.41%
20117,962590.75%
20107,903-799-0.96%
20008,702-476-0.53%
19909,1782,5373.29%
19806,6412,5234.89%
19704,1180.00%

Oak Brook Population by Year