Grayslake, Illinois demographics

Grayslake, IL demographics: median age 37.2; 58.5% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Grayslake village, Illinois · Incorporated village · GEOID 1731121. The survey estimates a population of 20,929 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Grayslake is 37.2 years, with a 90% margin of error of 1.9 years. There are 8,165 households (±310). 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	37.2 ±1.9	39.0 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 20,929
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Under 18	4,916 ±552	23.5% ±2.6 pp	21.8%	22.0%
18–34	5,004 ±590	23.9% ±2.8 pp	22.7%	22.8%
35–64	8,059 ±612	38.5% ±2.8 pp	38.5%	38.0%
65 and older	2,950 ±384	14.1% ±1.8 pp	17.0%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 20,929
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Male	10,794 ±415	51.6% ±1.7 pp	49.4%	49.5%
Female	10,135 ±412	48.4% ±1.7 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: 20,929
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
White alone	15,683 ±844	74.9% ±3.8 pp	61.0%	61.0%
Black or African American alone	1,802 ±663	8.6% ±3.2 pp	13.6%	12.2%
American Indian and Alaska Native alone	44 ±49 · low precision	0.2% ±0.2 pp · low precision	0.6%	0.9%
Asian alone	1,094 ±343	5.2% ±1.6 pp	6.0%	6.0%
Native Hawaiian and Other Pacific Islander alone	0 ±24 · low precision	0.0% ±0.1 pp · low precision	0.0%	0.2%
Some other race alone	283 ±164 · low precision	1.4% ±0.8 pp · low precision	7.9%	7.1%
Two or more races	2,023 ±487	9.7% ±2.3 pp	10.9%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 20,929
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Not Hispanic or Latino	18,789 ±638	89.8% ±2.5 pp	81.2%	80.7%
Hispanic or Latino	2,140 ±458	10.2% ±2.2 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: 8,165
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Married-couple family	4,659 ±302	57.1% ±3.0 pp	45.3%	46.9%
Other family: male householder, no spouse present	249 ±144 · low precision	3.0% ±1.8 pp · low precision	4.9%	5.1%
Other family: female householder, no spouse present	753 ±178	9.2% ±2.2 pp	11.9%	12.2%
Nonfamily: householder living alone	2,039 ±331	25.0% ±3.9 pp	31.2%	28.7%
Nonfamily: householder not living alone	465 ±178	5.7% ±2.2 pp	6.7%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 8,165
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Households with people under 18	2,768 ±312	33.9% ±3.6 pp	28.6%	29.5%
Households without people under 18	5,397 ±472	66.1% ±5.2 pp	71.4%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 8,165
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
One-person nonfamily households	2,039 ±331	25.0% ±3.9 pp	31.2%	28.7%
Two-person households	2,656 ±343	32.5% ±4.0 pp	32.3%	33.8%
Three-person households	1,481 ±293	18.1% ±3.5 pp	14.7%	15.3%
Four-person households	1,438 ±278	17.6% ±3.3 pp	12.6%	12.6%
Five-person households	441 ±108	5.4% ±1.3 pp	5.8%	5.9%
Six-person households	80 ±72 · low precision	1.0% ±0.9 pp · low precision	2.1%	2.2%
Seven or more people	30 ±44 · low precision	0.4% ±0.5 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: 20,929
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Native	18,918 ±568	90.4% ±2.1 pp	85.3%	85.9%
Foreign born	2,011 ±362	9.6% ±1.7 pp	14.7%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 19,531
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
English only	16,573 ±715	84.9% ±3.0 pp	76.0%	77.7%
Spanish	1,295 ±397	6.6% ±2.0 pp	14.0%	13.6%
French, Haitian, or Cajun	97 ±110 · low precision	0.5% ±0.6 pp · low precision	0.3%	0.7%
German or other West Germanic	91 ±72 · low precision	0.5% ±0.4 pp · low precision	0.3%	0.5%
Russian, Polish, or other Slavic	263 ±157 · low precision	1.3% ±0.8 pp · low precision	2.5%	0.7%
Other Indo-European	295 ±162 · low precision	1.5% ±0.8 pp · low precision	2.6%	2.0%
Korean	23 ±36 · low precision	0.1% ±0.2 pp · low precision	0.3%	0.3%
Chinese, including Mandarin and Cantonese	194 ±158 · low precision	1.0% ±0.8 pp · low precision	0.9%	1.1%
Vietnamese	103 ±105 · low precision	0.5% ±0.5 pp · low precision	0.2%	0.5%
Tagalog, including Filipino	176 ±139 · low precision	0.9% ±0.7 pp · low precision	0.7%	0.6%
Other Asian and Pacific Island	288 ±170 · low precision	1.5% ±0.9 pp · low precision	1.0%	1.1%
Arabic	0 ±24 · low precision	0.0% ±0.1 pp · low precision	0.6%	0.5%
Other and unspecified	133 ±123 · low precision	0.7% ±0.6 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: 14,041
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Less than high school graduate	420 ±155	3.0% ±1.1 pp	9.5%	10.4%
High school graduate or equivalency	1,865 ±379	13.3% ±2.7 pp	25.1%	26.0%
Some college, no degree	2,254 ±381	16.1% ±2.7 pp	19.2%	19.1%
Associate’s degree	1,293 ±239	9.2% ±1.7 pp	8.3%	8.8%
Bachelor’s degree	4,877 ±440	34.7% ±2.9 pp	22.6%	21.6%
Graduate or professional degree	3,332 ±432	23.7% ±3.0 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: 20,753
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Same house	18,222 ±717	87.8% ±3.0 pp	88.9%	87.7%
Moved within same county	1,471 ±428	7.1% ±2.1 pp	6.4%	6.3%
Moved from a different county in the same state	551 ±288 · low precision	2.7% ±1.4 pp · low precision	2.4%	3.1%
Moved from a different state	425 ±214 · low precision	2.0% ±1.0 pp · low precision	1.6%	2.3%
Moved from abroad	84 ±87 · low precision	0.4% ±0.4 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

3.0% of Grayslake residents (±1.1 percentage points) had no health insurance coverage when surveyed, compared with 6.9% in Illinois and 8.4% nationally. 95.7% 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	Grayslake	Illinois	U.S.	Compared with Illinois
People without health insurance Civilian noninstitutionalized population	3.0% ±1.1 pp	6.9%	8.4%	Lower
Households with a broadband subscription Households	95.7% ±2.1 pp	90.8%	91.0%	Higher
Veterans Civilian population age 18 and older	7.0% ±2.1 pp	4.8%	6.2%	Higher

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 Grayslake . 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 Grayslake housing and cost context or return to the city profile.