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CITY · 1990 CENSUS

Oak Brook

Illinois · 9,178 residents · 7.976 sq mi
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The short version

Oak Brook is significantly wealthier than the US average, with a median household income of $110,331. Population has held roughly steady since 2000. 52% of adults hold a bachelor's degree or higher, well above the national rate of 20%. Median home value is $480,300. With a median age of 42.2, the population is older than the US median of 33.0. Households here earn about 242% more than the Illinois median.

At a glance
Wealthier
above the US median
US median: $30,130
Older
median age 42.2
US median: 33.0
More educated
52% hold a bachelor's degree
US average: 20%
Stable housing
home values roughly flat, inflation adjusted
US median home: $93,722
Section 01

Population & growth

9,178
+5%vs 2000
vs 8,702 in 2000
1990 – 2025
1,151 / sq mi
+5%vs 2000
vs 1,091 / sq mi in 2000
US average: 221
42.2
−16%vs 2000
vs 50.0 in 2000
US average: 33.0
Population, 19902024
8K8K9K9K9K1990201020202024Oak Brook
20248K
1990201020202024
Section 02

Income & economy

$110,331
−1%inflation adjusted, since 2000
vs $146,537 in 2000
US average: $30,130
1990 – 2024
$60,347
−21%vs 2000
vs $76,668 in 2000
US average: $14,340
2.7%
+0.6 ptsvs 2000
vs 2.1% in 2000
US average: 13.2%
Section 03

Housing

$480,300
+8%inflation adjusted, since 2000
vs $588,200 in 2000
US average: $93,722
1990 – 2024
$646
−15%inflation adjusted, since 2000
vs $996 in 2000
US average: $450
95.8%
−1.1 ptsvs 2000
vs 97.0% in 2000
4.2% rent
4.4
+8%vs 2000
vs 4.0 in 2000
1990 – 2024
RELATED:See current rent listings in Oak Brook on RentDataNow
Section 04

Race & ethnicity

2000
White, non-Hispanic74.5%(6,480)
Black1.4%(119)
Hispanic / Latino2.4%(208)
Asian20.1%(1,750)
Other0%
Diversity Score48%(4,176)
1990
White, non-Hispanic81.2%(7,457)
Black1.3%(121)
Hispanic / Latino1.7%(157)
Asian17.2%(1,576)
Other0.3%(24)
Diversity Score41.6%(3,819)
42
−13%vs 2000
vs 48 in 2000
1990 – 2024
Section 05

Education

52.0%
−8.7 ptsvs 2000
vs 60.7% in 2000
US average: 20.3%
High school or higher
94.6%
−1.4 ptsvs 2000
vs 96.0% in 2000
US average: 75.2%
26.8%
−8.0 ptsvs 2000
vs 34.9% in 2000
US average: 7.1%
Section 06

Commute & transportation

26.1 min
+24%vs 2000
vs 21.0 min in 2000
US average: 21.9
Section 07

Work & employment

No data for the years selected.

Section 08

People & community

No data for the years selected.

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Frequently asked

How many people live in Oak Brook, Illinois?

Oak Brook, Illinois has about 9,178 residents according to the 1990 Census.

What is the median household income in Oak Brook, Illinois?

The typical household in Oak Brook, Illinois earns about $110,331 a year. Half of households make more than that, and half make less.

Is Oak Brook, Illinois expensive?

In Oak Brook, Illinois, the median home is worth about $480,300, and the typical rent is about $646 a month.

How educated are people in Oak Brook, Illinois?

About 52.0% of adults age 25 and over in Oak Brook, Illinois hold a bachelor's degree or higher.

What is the poverty rate in Oak Brook, Illinois?

About 2.7% of people in Oak Brook, Illinois live below the federal poverty line.

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DATA: US CENSUS BUREAU ACS 5-YEAR + DECENNIAL CENSUS · UPDATED 2024

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