Oak Brook, Illinois Demographics & Population 2026
During the 2020–2024 ACS period, Oak Brook, Illinois had a total population of 8,056, the 262nd largest village in Illinois, with a median household income of $175,870, which is 111% higher than the state average. The poverty rate is 6.6%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Key Takeaways
- Household income is 111% above the state average — one of the wealthiest communities in Illinois.
- 66.4% of adults hold a bachelor's degree or higher — top 10% in Illinois.
- Unemployment rate of 10.0% is notably above the national average.
Oak Brook Quick Facts
How Oak Brook Changed
Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.
| Metric | 2019–2023 | 2020–2024 | Change |
|---|---|---|---|
| Population | 8,028 | 8,056 | +0.3% |
| Median household income | $171,123 | $175,870 | +2.8% |
| Median home value | $867,900 | $903,200 | +4.1% |
How Oak Brook Compares
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Detailed income brackets
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
Moderate diversity with one or two groups making up the majority.
State average: 61 | National average: 61
Education
Educational Attainment (Adults 25+)
Oak Brook Rankings in Illinois
Explore Illinois Rankings
Other Cities in DuPage County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Aurora | 179,898 | $93,633 | 9.5% | $274,800 |
| Naperville | 150,692 | $155,105 | 4.5% | $540,200 |
| Bolingbrook | 74,096 | $108,400 | 9.2% | $314,700 |
| Wheaton | 53,557 | $120,008 | 5.6% | $455,700 |
| Downers Grove | 50,054 | $115,114 | 5.5% | $449,800 |
| Lombard | 43,619 | $100,362 | 7.2% | $335,700 |
| Carol Stream | 39,460 | $102,309 | 6.4% | $335,000 |
| Addison | 35,489 | $90,431 | 8.7% | $341,300 |
| St. Charles | 32,854 | $114,300 | 4.5% | $377,400 |
| Glendale Heights | 32,808 | $86,545 | 10.3% | $261,700 |
Cities Similar to Oak Brook
These cities in the same state have comparable population and economic profiles.
| City | Population | Median Income | Home Value | Bachelor's+ | Poverty |
|---|---|---|---|---|---|
| Lincolnshire | 7,980 | $185,580 | $677,700 | 77.0% | 5.2% |
| Gilberts | 8,606 | $146,333 | $347,300 | 49.5% | 5.5% |
| Riverside | 9,039 | $153,686 | $491,400 | 72.5% | 3.3% |
| Inverness | 7,275 | $207,434 | $715,600 | 68.5% | 2.6% |
| Rockton | 7,974 | $119,058 | $235,400 | 38.4% | 5.5% |
Population Overview
Oak Brook is a small city located in Illinois, within DuPage County. The total population is 8,056. It ranks as the 262nd most populous out of 1,445 Census-designated places in Illinois.
Age Demographics
The median age in Oak Brook is 55.2 years. This is 42% higher than the state median of 39.0 years. 21.3% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.
Economy, Income & Housing
The median household income in Oak Brook is $175,870. This is 111% higher than the state median of $83,390. It is also 118% higher than the national median of $80,734. The poverty rate stands at 6.6%. This is 44% lower than the state poverty rate of 11.8%. The unemployment rate is 10.0%. This is 71% higher than the state rate of 5.8%. The median home value is $903,200. Housing costs are 243% higher than the state median of $263,300. The home-value-to-income ratio is 5.1x. 91.1% of occupied housing units are owner-occupied. This homeownership rate is 36% higher than the state average of 67.1%.
Race & Ethnicity
The largest racial or ethnic group in Oak Brook is White (non-Hispanic), making up 59.3% of the population. Asian residents account for 32.7%. The Black or African American population (0.3%) is well below the state average of 13.3%. The Hispanic or Latino population (5.8%) is well below the state average of 18.8%. The Asian population is significantly higher than the state average (32.7% vs 5.9%).
Education
66.4% of residents aged 25 and older hold a bachelor's degree or higher. This places Oak Brook in the top 10% of all cities in the state for educational attainment. This is 75% higher than the state rate of 37.9%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 96.9%. Notably, 34.3% of adults hold a graduate or professional degree, indicating a highly educated workforce.
Data Sources & Methodology
All demographic data for Oak Brook, Illinois is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against Illinois state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 1,445 Census-designated places in Illinois. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.
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Frequently Asked Questions
What is the population of Oak Brook, Illinois?
Oak Brook, Illinois has a population of 8,056 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in Oak Brook, IL?
The median household income in Oak Brook is $175,870, which is 118% higher than the national median of $80,734.
What is the poverty rate in Oak Brook, IL?
The poverty rate in Oak Brook is 6.6%. This means approximately 528 residents live below the federal poverty line.
What is the racial makeup of Oak Brook, Illinois?
Oak Brook's population is 59.3% White, 0.3% Black, 5.8% Hispanic/Latino, and 32.7% Asian.
What is the median home value in Oak Brook, IL?
The median home value in Oak Brook is $903,200. The home-value-to-income ratio is 5.1x.
How educated is Oak Brook, Illinois?
66.4% of adults (25+) in Oak Brook hold a bachelor's degree or higher, and 34.3% hold a graduate or professional degree.