Buffalo Grove, Illinois demographics

Buffalo Grove, IL demographics: median age 42.0; 68.6% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Buffalo Grove village, Illinois · Incorporated village · GEOID 1709447. The survey estimates a population of 42,891 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Buffalo Grove is 42.0 years, with a 90% margin of error of 1.0 years. There are 16,213 households (±461). 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	42.0 ±1.0	39.0 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 42,891
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Under 18	10,517 ±778	24.5% ±1.8 pp	21.8%	22.0%
18–34	6,623 ±703	15.4% ±1.6 pp	22.7%	22.8%
35–64	18,977 ±1,044	44.2% ±2.4 pp	38.5%	38.0%
65 and older	6,774 ±533	15.8% ±1.2 pp	17.0%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 42,891
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Male	20,592 ±522	48.0% ±1.2 pp	49.4%	49.5%
Female	22,299 ±532	52.0% ±1.2 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: 42,891
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
White alone	25,408 ±1,171	59.2% ±2.7 pp	61.0%	61.0%
Black or African American alone	1,452 ±898 · low precision	3.4% ±2.1 pp · low precision	13.6%	12.2%
American Indian and Alaska Native alone	233 ±259 · low precision	0.5% ±0.6 pp · low precision	0.6%	0.9%
Asian alone	12,767 ±868	29.8% ±2.0 pp	6.0%	6.0%
Native Hawaiian and Other Pacific Islander alone	32 ±42 · low precision	0.1% ±0.1 pp · low precision	0.0%	0.2%
Some other race alone	1,084 ±378	2.5% ±0.9 pp	7.9%	7.1%
Two or more races	1,915 ±391	4.5% ±0.9 pp	10.9%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 42,891
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Not Hispanic or Latino	40,413 ±546	94.2% ±1.3 pp	81.2%	80.7%
Hispanic or Latino	2,478 ±548	5.8% ±1.3 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: 16,213
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Married-couple family	10,358 ±423	63.9% ±1.9 pp	45.3%	46.9%
Other family: male householder, no spouse present	304 ±129	1.9% ±0.8 pp	4.9%	5.1%
Other family: female householder, no spouse present	1,215 ±332	7.5% ±2.0 pp	11.9%	12.2%
Nonfamily: householder living alone	3,853 ±493	23.8% ±3.0 pp	31.2%	28.7%
Nonfamily: householder not living alone	483 ±151	3.0% ±0.9 pp	6.7%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 16,213
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Households with people under 18	6,163 ±439	38.0% ±2.5 pp	28.6%	29.5%
Households without people under 18	10,050 ±667	62.0% ±3.7 pp	71.4%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 16,213
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
One-person nonfamily households	3,853 ±493	23.8% ±3.0 pp	31.2%	28.7%
Two-person households	4,558 ±415	28.1% ±2.4 pp	32.3%	33.8%
Three-person households	3,277 ±439	20.2% ±2.6 pp	14.7%	15.3%
Four-person households	3,387 ±457	20.9% ±2.8 pp	12.6%	12.6%
Five-person households	841 ±168	5.2% ±1.0 pp	5.8%	5.9%
Six-person households	272 ±128	1.7% ±0.8 pp	2.1%	2.2%
Seven or more people	25 ±41 · low precision	0.2% ±0.3 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: 42,891
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Native	26,545 ±1,260	61.9% ±2.9 pp	85.3%	85.9%
Foreign born	16,346 ±1,268	38.1% ±3.0 pp	14.7%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 41,003
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
English only	22,392 ±1,247	54.6% ±3.0 pp	76.0%	77.7%
Spanish	1,786 ±497	4.4% ±1.2 pp	14.0%	13.6%
French, Haitian, or Cajun	159 ±114 · low precision	0.4% ±0.3 pp · low precision	0.3%	0.7%
German or other West Germanic	323 ±263 · low precision	0.8% ±0.6 pp · low precision	0.3%	0.5%
Russian, Polish, or other Slavic	5,507 ±1,187	13.4% ±2.9 pp	2.5%	0.7%
Other Indo-European	3,589 ±674	8.8% ±1.6 pp	2.6%	2.0%
Korean	1,349 ±399	3.3% ±1.0 pp	0.3%	0.3%
Chinese, including Mandarin and Cantonese	1,384 ±311	3.4% ±0.8 pp	0.9%	1.1%
Vietnamese	18 ±32 · low precision	0.0% ±0.1 pp · low precision	0.2%	0.5%
Tagalog, including Filipino	407 ±214 · low precision	1.0% ±0.5 pp · low precision	0.7%	0.6%
Other Asian and Pacific Island	3,635 ±654	8.9% ±1.6 pp	1.0%	1.1%
Arabic	101 ±91 · low precision	0.2% ±0.2 pp · low precision	0.6%	0.5%
Other and unspecified	353 ±180 · low precision	0.9% ±0.4 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: 29,401
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Less than high school graduate	928 ±232	3.2% ±0.8 pp	9.5%	10.4%
High school graduate or equivalency	2,819 ±391	9.6% ±1.3 pp	25.1%	26.0%
Some college, no degree	3,579 ±543	12.2% ±1.8 pp	19.2%	19.1%
Associate’s degree	1,892 ±377	6.4% ±1.3 pp	8.3%	8.8%
Bachelor’s degree	11,053 ±752	37.6% ±2.5 pp	22.6%	21.6%
Graduate or professional degree	9,130 ±664	31.1% ±2.2 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: 42,513
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Same house	37,646 ±799	88.6% ±1.8 pp	88.9%	87.7%
Moved within same county	1,817 ±560	4.3% ±1.3 pp	6.4%	6.3%
Moved from a different county in the same state	1,962 ±517	4.6% ±1.2 pp	2.4%	3.1%
Moved from a different state	521 ±228	1.2% ±0.5 pp	1.6%	2.3%
Moved from abroad	567 ±299 · low precision	1.3% ±0.7 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

3.8% of Buffalo Grove residents (±0.8 percentage points) had no health insurance coverage when surveyed, compared with 6.9% in Illinois and 8.4% nationally. 95.1% 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	Buffalo Grove	Illinois	U.S.	Compared with Illinois
People without health insurance Civilian noninstitutionalized population	3.8% ±0.8 pp	6.9%	8.4%	Lower
Households with a broadband subscription Households	95.1% ±0.8 pp	90.8%	91.0%	Higher
Veterans Civilian population age 18 and older	2.5% ±0.6 pp	4.8%	6.2%	Lower

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 Buffalo Grove . 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 Buffalo Grove housing and cost context or return to the city profile.