Northbrook, Illinois demographics

Northbrook, IL demographics: median age 49.6; 72.6% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Northbrook village, Illinois · Incorporated village · GEOID 1753481. The survey estimates a population of 34,585 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Northbrook is 49.6 years, with a 90% margin of error of 1.5 years. There are 13,302 households (±464). 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	49.6 ±1.5	39.0 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 34,585
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Under 18	7,319 ±644	21.2% ±1.9 pp	21.8%	22.0%
18–34	3,925 ±726	11.3% ±2.1 pp	22.7%	22.8%
35–64	14,153 ±958	40.9% ±2.8 pp	38.5%	38.0%
65 and older	9,188 ±686	26.6% ±2.0 pp	17.0%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 34,585
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Male	16,980 ±439	49.1% ±1.2 pp	49.4%	49.5%
Female	17,605 ±371	50.9% ±1.0 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: 34,585
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
White alone	26,239 ±965	75.9% ±2.7 pp	61.0%	61.0%
Black or African American alone	626 ±355 · low precision	1.8% ±1.0 pp · low precision	13.6%	12.2%
American Indian and Alaska Native alone	6 ±12 · low precision	0.0% ±0.0 pp · low precision	0.6%	0.9%
Asian alone	5,600 ±866	16.2% ±2.5 pp	6.0%	6.0%
Native Hawaiian and Other Pacific Islander alone	0 ±27 · low precision	0.0% ±0.1 pp · low precision	0.0%	0.2%
Some other race alone	241 ±164 · low precision	0.7% ±0.5 pp · low precision	7.9%	7.1%
Two or more races	1,873 ±450	5.4% ±1.3 pp	10.9%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 34,585
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Not Hispanic or Latino	32,717 ±870	94.6% ±2.4 pp	81.2%	80.7%
Hispanic or Latino	1,868 ±819	5.4% ±2.4 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: 13,302
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Married-couple family	8,788 ±284	66.1% ±3.1 pp	45.3%	46.9%
Other family: male householder, no spouse present	196 ±95	1.5% ±0.7 pp	4.9%	5.1%
Other family: female householder, no spouse present	725 ±182	5.5% ±1.4 pp	11.9%	12.2%
Nonfamily: householder living alone	3,091 ±432	23.2% ±3.1 pp	31.2%	28.7%
Nonfamily: householder not living alone	502 ±186	3.8% ±1.4 pp	6.7%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 13,302
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Households with people under 18	3,668 ±293	27.6% ±2.0 pp	28.6%	29.5%
Households without people under 18	9,634 ±503	72.4% ±2.8 pp	71.4%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 13,302
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
One-person nonfamily households	3,091 ±432	23.2% ±3.1 pp	31.2%	28.7%
Two-person households	5,221 ±423	39.2% ±2.9 pp	32.3%	33.8%
Three-person households	1,569 ±249	11.8% ±1.8 pp	14.7%	15.3%
Four-person households	2,233 ±307	16.8% ±2.2 pp	12.6%	12.6%
Five-person households	1,045 ±266	7.9% ±2.0 pp	5.8%	5.9%
Six-person households	131 ±72 · low precision	1.0% ±0.5 pp · low precision	2.1%	2.2%
Seven or more people	12 ±33 · low precision	0.1% ±0.2 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: 34,585
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Native	27,434 ±783	79.3% ±2.2 pp	85.3%	85.9%
Foreign born	7,151 ±777	20.7% ±2.2 pp	14.7%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 32,933
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
English only	24,446 ±988	74.2% ±2.9 pp	76.0%	77.7%
Spanish	739 ±305	2.2% ±0.9 pp	14.0%	13.6%
French, Haitian, or Cajun	114 ±72 · low precision	0.3% ±0.2 pp · low precision	0.3%	0.7%
German or other West Germanic	184 ±115 · low precision	0.6% ±0.3 pp · low precision	0.3%	0.5%
Russian, Polish, or other Slavic	2,621 ±727	8.0% ±2.2 pp	2.5%	0.7%
Other Indo-European	1,571 ±569	4.8% ±1.7 pp	2.6%	2.0%
Korean	1,388 ±338	4.2% ±1.0 pp	0.3%	0.3%
Chinese, including Mandarin and Cantonese	885 ±291	2.7% ±0.9 pp	0.9%	1.1%
Vietnamese	41 ±55 · low precision	0.1% ±0.2 pp · low precision	0.2%	0.5%
Tagalog, including Filipino	143 ±99 · low precision	0.4% ±0.3 pp · low precision	0.7%	0.6%
Other Asian and Pacific Island	391 ±330 · low precision	1.2% ±1.0 pp · low precision	1.0%	1.1%
Arabic	315 ±220 · low precision	1.0% ±0.7 pp · low precision	0.6%	0.5%
Other and unspecified	95 ±65 · low precision	0.3% ±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: 25,481
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Less than high school graduate	720 ±245	2.8% ±1.0 pp	9.5%	10.4%
High school graduate or equivalency	2,585 ±668	10.1% ±2.6 pp	25.1%	26.0%
Some college, no degree	2,703 ±428	10.6% ±1.7 pp	19.2%	19.1%
Associate’s degree	969 ±323	3.8% ±1.3 pp	8.3%	8.8%
Bachelor’s degree	8,493 ±656	33.3% ±2.4 pp	22.6%	21.6%
Graduate or professional degree	10,011 ±871	39.3% ±3.3 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: 34,322
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Same house	31,543 ±700	91.9% ±1.9 pp	88.9%	87.7%
Moved within same county	1,928 ±611	5.6% ±1.8 pp	6.4%	6.3%
Moved from a different county in the same state	266 ±169 · low precision	0.8% ±0.5 pp · low precision	2.4%	3.1%
Moved from a different state	290 ±136	0.8% ±0.4 pp	1.6%	2.3%
Moved from abroad	295 ±146	0.9% ±0.4 pp	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

2.2% of Northbrook residents (±0.7 percentage points) had no health insurance coverage when surveyed, compared with 6.9% in Illinois and 8.4% nationally. 94.7% 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	Northbrook	Illinois	U.S.	Compared with Illinois
People without health insurance Civilian noninstitutionalized population	2.2% ±0.7 pp	6.9%	8.4%	Lower
Households with a broadband subscription Households	94.7% ±1.4 pp	90.8%	91.0%	Higher
Veterans Civilian population age 18 and older	3.7% ±1.3 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 Northbrook . 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 Northbrook housing and cost context or return to the city profile.