Oak Brook is a city of 8,056 people in Illinois. At a median age of 55.2, this is an older place than the country as a whole. That is roughly 111% ahead of the Illinois median. 66% of adults hold a bachelor's degree, against 36% nationally. Home values have risen by half since 2000, reaching $903,200. Owners hold 91% of the housing stock.
At a glance
Wealthier
median household income $175,870, above the US median
US median: $82,259
Older
median age 55.2
US median: 38.9
More educated
66% hold a bachelor's degree
US average: 36%
More affordable
home values down 16%, inflation adjusted
US median home: $376,019
Unique to this place
What stands out about Oak Brook
What changed most since 1990
Median home value (2024 dollars)$1,152,753 → $903,200(−22%)US over the same years: +67%
Asian share17.1% → 32.7%(+15.7 pts)US over the same years: +3.1 pts
Median age42.2 → 55.2(+13.0 years)US over the same years: +6.0 years
Shares are "alone or in combination": a person with both Medicare and Medicaid counts in each, so categories overlap and do not sum to 100%.
Section 09 · Service history
Veterans
Veterans by period of service, 2024
Gulf War (2001 or later)3.9%(10)
US avg: 26.4%
Gulf War (1990s)5.1%(13)
US avg: 24.3%
Vietnam era44%(113)
US avg: 33.1%
Korean War14%(36)
US avg: 4.5%
World War II0%(0)
US avg: 1%
Share of the 257 veterans here. A veteran who served across eras counts in each, so shares can total more than 100%. Peacetime-only service is included in the total but not shown as an era.
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Over time
Oak Brook, decade by decade
Oak Brook population, inflation-adjusted income and home value, education, and diversity by year
Year
Population
Median household income
Median home value
Bachelor's degree+
Diversity score
1990
9,178
$264,802
$1,152,753
52.0%
41.5
2000
8,702
$266,940
$1,071,498
60.7%
50.5
2010
7,883
$189,487
$1,216,168
57.0%
59.4
2020
8,163
$170,586
$934,118
66.0%
70.6
2024
8,056
$175,870
$903,200
66.4%
67.2
Census years come from the decennial census and the latest year from the American Community Survey, so part of any change between those two rows can reflect the different surveys. Dollar figures are adjusted for inflation to 2024 dollars; a figure ending in "+" was at the Census Bureau's reporting cap that year. The diversity score runs from 0 to 100; see how it's calculated.
