Willowbrook, Illinois demographics

Willowbrook, IL demographics: median age 45.0; 53.1% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Willowbrook village, Illinois · Incorporated village · GEOID 1781919. The survey estimates a population of 9,131 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Willowbrook is 45.0 years, with a 90% margin of error of 5.2 years. There are 3,965 households (±268). Age and household distributions show how these totals are composed; they do not establish which neighborhood suits a particular person.

Every count and share is an estimate. “±” is a 90% margin of error (MOE); pp means percentage points. Derived shares use the category count divided by the named universe. Aggregated category MOEs and percentage MOEs are approximate. A margin larger than half its estimate is flagged as low precision. Blank source uncertainty is shown as unavailable, never zero.

Age distribution and sex

City, state and U.S. estimates · ACS 2020–2024
Measure / survey universe	City estimate ± MOE	State estimate ± MOE	U.S. estimate ± MOE
Median age Total population · years	45.0 ±5.2	39.0 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 9,131
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Under 18	1,370 ±229	15.0% ±2.5 pp	21.8%	22.0%
18–34	2,109 ±381	23.1% ±4.2 pp	22.7%	22.8%
35–64	3,224 ±368	35.3% ±4.0 pp	38.5%	38.0%
65 and older	2,428 ±319	26.6% ±3.5 pp	17.0%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 9,131
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Male	4,584 ±233	50.2% ±2.5 pp	49.4%	49.5%
Female	4,547 ±237	49.8% ±2.6 pp	50.6%	50.5%

The age groups are mutually exclusive and cover the entire population. The sex categories follow this ACS table’s published classification; they are not a survey of gender identity.

Race and Hispanic origin

Race · B02001 · ACS 2020–2024 Total population: 9,131
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
White alone	6,260 ±527	68.6% ±5.7 pp	61.0%	61.0%
Black or African American alone	341 ±233 · low precision	3.7% ±2.6 pp · low precision	13.6%	12.2%
American Indian and Alaska Native alone	0 ±18 · low precision	0.0% ±0.2 pp · low precision	0.6%	0.9%
Asian alone	1,729 ±389	18.9% ±4.3 pp	6.0%	6.0%
Native Hawaiian and Other Pacific Islander alone	0 ±18 · low precision	0.0% ±0.2 pp · low precision	0.0%	0.2%
Some other race alone	435 ±240 · low precision	4.8% ±2.6 pp · low precision	7.9%	7.1%
Two or more races	366 ±179	4.0% ±2.0 pp	10.9%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 9,131
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Not Hispanic or Latino	8,244 ±332	90.3% ±3.6 pp	81.2%	80.7%
Hispanic or Latino	887 ±328	9.7% ±3.6 pp	18.8%	19.3%

Hispanic origin and race are separate questions. People of Hispanic or Latino origin may be of any race and appear in both tables. Do not add the Hispanic share to race shares. Race alone and two-or-more-race groups are the mutually exclusive categories of the race table.

Household types, children and living alone

Household types · B11001 · ACS 2020–2024 Households: 3,965
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Married-couple family	1,970 ±250	49.7% ±5.3 pp	45.3%	46.9%
Other family: male householder, no spouse present	162 ±85 · low precision	4.1% ±2.1 pp · low precision	4.9%	5.1%
Other family: female householder, no spouse present	312 ±136	7.9% ±3.4 pp	11.9%	12.2%
Nonfamily: householder living alone	1,344 ±308	33.9% ±7.4 pp	31.2%	28.7%
Nonfamily: householder not living alone	177 ±90 · low precision	4.5% ±2.2 pp · low precision	6.7%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 3,965
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Households with people under 18	790 ±133	19.9% ±3.1 pp	28.6%	29.5%
Households without people under 18	3,175 ±299	80.1% ±5.3 pp	71.4%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 3,965
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
One-person nonfamily households	1,344 ±308	33.9% ±7.4 pp	31.2%	28.7%
Two-person households	1,421 ±266	35.8% ±6.3 pp	32.3%	33.8%
Three-person households	397 ±121	10.0% ±3.0 pp	14.7%	15.3%
Four-person households	578 ±136	14.6% ±3.3 pp	12.6%	12.6%
Five-person households	160 ±89 · low precision	4.0% ±2.2 pp · low precision	5.8%	5.9%
Six-person households	65 ±48 · low precision	1.6% ±1.2 pp · low precision	2.1%	2.2%
Seven or more people	0 ±25 · low precision	0.0% ±0.6 pp · low precision	1.3%	1.4%

A family household contains related people under the Census definition. A nonfamily household can contain one person or unrelated people sharing a home. Households with children can also appear in the household-type and size tables, so those tables must not be added together. Household estimates exclude people living in group quarters from the household universe.

Nativity and languages spoken at home

Nativity · B05002 · ACS 2020–2024 Total population: 9,131
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Native	6,331 ±350	69.3% ±3.8 pp	85.3%	85.9%
Foreign born	2,800 ±347	30.7% ±3.8 pp	14.7%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 8,659
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
English only	5,271 ±479	60.9% ±5.4 pp	76.0%	77.7%
Spanish	614 ±271	7.1% ±3.1 pp	14.0%	13.6%
French, Haitian, or Cajun	17 ±28 · low precision	0.2% ±0.3 pp · low precision	0.3%	0.7%
German or other West Germanic	20 ±37 · low precision	0.2% ±0.4 pp · low precision	0.3%	0.5%
Russian, Polish, or other Slavic	825 ±304	9.5% ±3.5 pp	2.5%	0.7%
Other Indo-European	984 ±303	11.4% ±3.5 pp	2.6%	2.0%
Korean	0 ±18 · low precision	0.0% ±0.2 pp · low precision	0.3%	0.3%
Chinese, including Mandarin and Cantonese	311 ±180 · low precision	3.6% ±2.1 pp · low precision	0.9%	1.1%
Vietnamese	91 ±97 · low precision	1.1% ±1.1 pp · low precision	0.2%	0.5%
Tagalog, including Filipino	45 ±44 · low precision	0.5% ±0.5 pp · low precision	0.7%	0.6%
Other Asian and Pacific Island	284 ±146 · low precision	3.3% ±1.7 pp · low precision	1.0%	1.1%
Arabic	197 ±112 · low precision	2.3% ±1.3 pp · low precision	0.6%	0.5%
Other and unspecified	0 ±18 · low precision	0.0% ±0.2 pp · low precision	0.6%	0.8%

Foreign born means not a U.S. citizen at birth; it includes naturalized citizens. Language categories describe speech at home among people age five and older. A language other than English at home does not establish that someone cannot speak English. This city page uses the published C16001 summary categories because the more detailed B16001 table does not provide these city records in this release.

Educational attainment

Highest completed education · B15003 · ACS 2020–2024 Population age 25 and older: 6,983
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Less than high school graduate	277 ±107	4.0% ±1.5 pp	9.5%	10.4%
High school graduate or equivalency	1,494 ±335	21.4% ±4.7 pp	25.1%	26.0%
Some college, no degree	1,200 ±221	17.2% ±3.1 pp	19.2%	19.1%
Associate’s degree	307 ±101	4.4% ±1.4 pp	8.3%	8.8%
Bachelor’s degree	1,815 ±303	26.0% ±4.2 pp	22.6%	21.6%
Graduate or professional degree	1,890 ±325	27.1% ±4.5 pp	15.3%	14.1%

The denominator excludes residents under 25. Each person is counted in the highest attainment category they completed. This table does not measure the quality of local schools or the education level of every current student.

Residence one year earlier

Geographic mobility · B07003 · ACS 2020–2024 Population age 1 and older: 9,041
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Same house	7,841 ±368	86.7% ±3.9 pp	88.9%	87.7%
Moved within same county	384 ±179	4.2% ±2.0 pp	6.4%	6.3%
Moved from a different county in the same state	504 ±242	5.6% ±2.7 pp	2.4%	3.1%
Moved from a different state	122 ±77 · low precision	1.3% ±0.9 pp · low precision	1.6%	2.3%
Moved from abroad	190 ±138 · low precision	2.1% ±1.5 pp · low precision	0.6%	0.6%

These are respondents’ residence patterns one year before their survey response, pooled across the five-year window. They are not a net migration count for 2025. A person can move to a different house within the same city or county; moves within the same county should not automatically be interpreted as new arrivals to the city.

Health insurance, internet access and veterans

3.2% of Willowbrook residents (±1.2 percentage points) had no health insurance coverage when surveyed, compared with 6.9% in Illinois and 8.4% nationally. 94.5% of households subscribe to broadband of any type, including cellular data plans. A subscription is not the same as available service: the FCC National Broadband Map shows providers at a specific address.

City, state and U.S. shares · ACS 2020–2024
Measure	Willowbrook	Illinois	U.S.	Compared with Illinois
People without health insurance Civilian noninstitutionalized population	3.2% ±1.2 pp	6.9%	8.4%	Lower
Households with a broadband subscription Households	94.5% ±2.4 pp	90.8%	91.0%	Higher
Veterans Civilian population age 18 and older	3.5% ±1.5 pp	4.8%	6.2%	Not statistically different

Reading and reusing the estimates

The Census table links above lead to the original detailed tables. Counts, source universes and uncertainty are retained in the source observation download for Willowbrook . Compare these figures with the same survey window; do not compare one city’s five-year estimate with another city’s annual estimate as though they measured the same period. For methods, see uncertainty and denominator calculations.

Read Willowbrook housing and cost context or return to the city profile.