Where does this demographic data come from?

All demographic data comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates, which samples about 3.5 million households annually. The 5-year estimates provide the most reliable data for small geographies like municipalities.

What is the difference between Census data and ACS data?

The decennial Census (conducted every 10 years) is a full population count focusing on basic demographics. The ACS is an ongoing survey that collects detailed data on income, education, housing, commute patterns, and more. ACS data is updated annually but represents averages over a 5-year period.

How accurate is this data for small towns?

For smaller municipalities, ACS estimates have wider margins of error because fewer residents are sampled. The 5-year estimates reduce this uncertainty by averaging over a longer period. For towns under 5,000 people, treat specific numbers as approximations rather than precise counts.

Oak Brook, IL Population, Income & Demographics 2026

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Demographics — 2024 ACS 5-Year Estimatesi

Census

Populationi

8,056

Median Agei

55.2

Race & Ethnicityi

White

59.3%4,775

Asian

32.7%2,637

Hispanic/Latino

5.7%463

Two or More

1.6%132

Black

0.3%26

Other

0.3%23

Educational Attainment (Age 25+)i

GED/Alternative

1.7%101

High School Diploma

9.6%578

Some College (<1 yr)

3.6%216

Some College (1+ yr)

9.4%568

Associate's Degree

6.2%375

Bachelor's Degree

32%1,927

Master's Degree

13.2%792

Professional Degree

16.6%1,001

Doctorate

4.6%274

HS or Higher

96.9%

BA or Higher

66.4%

Graduate+

34.3%

Housingi

Median Home Valuei

$903,200

Median Renti

$2,590

Tenure

Owner-Occupied

91.1%2,789

Renter-Occupied

8.9%272

Total Units

3,373

Homeownership

91.1%

Vacancy Rate

9.2%

Economyi

Median Household Incomei

$175,870

Mean Household Incomei

$271,560

Per Capita Incomei

$104,806

Poverty Ratei

6.6%

Unemploymenti

10%

Labor Forcei

3,242

Household Income Distribution

Under $10K

5.8%177

$10K–$15K

0.3%10

$15K–$20K

4.4%134

$20K–$25K

2.5%75

$25K–$30K

0.3%9

$30K–$35K

0.5%14

$35K–$40K

2%60

$40K–$45K

0.3%10

$45K–$50K

1.2%37

$50K–$60K

3.8%115

$60K–$75K

2.9%90

$75K–$100K

6.7%206

$100K–$125K

8.9%273

$125K–$150K

2.5%76

$150K–$200K

14.3%437

$200K+

43.7%1,338

Federally Subsidized Housingi

HUD

The federal government helps low-income families, seniors, and people with disabilities afford housing through several programs. Residents typically pay about 30% of their income toward rent, with the government covering the rest. This data shows how many households in this community receive that assistance.

Subsidized Homesi

Programs in this community

Housing Choice Vouchers1 homes

Rental vouchers (Section 8) that help tenants pay for private-market housing

Ancestry & Heritage

Self-reported ancestry groups. Residents may report multiple ancestries, so totals may exceed 100%.

Social Characteristicsi

Marital Status (15+)i

Veteransi

257(3.9% of civilian adults)