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CITY · 2000 CENSUS

Oak Brook

Illinois · 8,702 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 $146,537. Population has declined 5% since 1990. 61% of adults hold a bachelor's degree or higher, well above the national rate of 24%. Median home value is $588,200. With a median age of 50.0, the population is older than the US median of 35.2. Households here earn about 215% more than the Illinois median.

At a glance
Wealthier
above the US median
US median: $42,589
Older
median age 50.0
US median: 35.2
More educated
61% hold a bachelor's degree
US average: 24%
More affordable
home values down 7%, inflation adjusted
US median home: $120,530
Section 01

Population & growth

8,702
−5%since 1990
from 9,178 in 1990
1990 – 2025
1,091 / sq mi
−5%since 1990
from 1,151 / sq mi in 1990
US average: 242
50.0
+18%since 1990
from 42.2 in 1990
US average: 35.2
Population, 19902024
8K8K9K9K9K1990201020202024Oak Brook
20248K
1990201020202024
Section 02

Income & economy

$146,537
+1%inflation adjusted, since 1990
from $110,331 in 1990
US average: $42,589
1990 – 2024
$76,668
+27%since 1990
from $60,347 in 1990
US average: $21,522
2.1%
−0.6 ptssince 1990
from 2.7% in 1990
US average: 12.4%
Section 03

Housing

$588,200
−7%inflation adjusted, since 1990
from $480,300 in 1990
US average: $120,530
1990 – 2024
$996
+17%inflation adjusted, since 1990
from $646 in 1990
US average: $602
97.0%
+1.1 ptssince 1990
from 95.8% in 1990
3.0% rent
4.0
−8%since 1990
from 4.4 in 1990
1990 – 2024
RELATED:See current rent listings in Oak Brook on RentDataNow
Section 04

Race & ethnicity

1990
White, non-Hispanic81.2%(7,457)
Black1.3%(121)
Hispanic / Latino1.7%(157)
Asian17.2%(1,576)
Diversity Score41.6%(3,819)
2000
White, non-Hispanic74.5%(6,480)
Black1.4%(119)
Hispanic / Latino2.4%(208)
Asian20.1%(1,750)
Diversity Score48%(4,176)
48
+15%since 1990
from 42 in 1990
1990 – 2024
Section 05

Education

60.7%
+8.7 ptssince 1990
from 52.0% in 1990
US average: 24.4%
High school or higher
96.0%
+1.4 ptssince 1990
from 94.6% in 1990
US average: 80.3%
34.9%
+8.0 ptssince 1990
from 26.8% in 1990
US average: 8.8%
Section 06

Commute & transportation

21.0 min
−20%since 1990
from 26.1 min in 1990
US average: 17.6
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 8,702 residents according to the 2000 Census.

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

The typical household in Oak Brook, Illinois earns about $146,537 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 $588,200, and the typical rent is about $996 a month.

How educated are people in Oak Brook, Illinois?

About 60.7% 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 2.1% of people in Oak Brook, Illinois live below the federal poverty line.

Has Oak Brook, Illinois grown since 1990?

Yes, Oak Brook, Illinois has shrunk since 1990. The population has lost about 476 residents, a change of about -5 percent over that period.

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

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