Island Lake, Illinois demographics

Island Lake, IL demographics: median age 39.1; 30.4% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Island Lake village, Illinois · Incorporated village · GEOID 1737894. The survey estimates a population of 8,014 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Island Lake is 39.1 years, with a 90% margin of error of 2.2 years. There are 2,905 households (±172). 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	39.1 ±2.2	39.0 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 8,014
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Under 18	1,867 ±332	23.3% ±4.1 pp	21.8%	22.0%
18–34	1,595 ±256	19.9% ±3.2 pp	22.7%	22.8%
35–64	3,441 ±368	42.9% ±4.6 pp	38.5%	38.0%
65 and older	1,111 ±226	13.9% ±2.8 pp	17.0%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 8,014
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Male	3,812 ±245	47.6% ±3.0 pp	49.4%	49.5%
Female	4,202 ±243	52.4% ±3.0 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: 8,014
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
White alone	6,674 ±372	83.3% ±4.6 pp	61.0%	61.0%
Black or African American alone	27 ±31 · low precision	0.3% ±0.4 pp · low precision	13.6%	12.2%
American Indian and Alaska Native alone	6 ±10 · low precision	0.1% ±0.1 pp · low precision	0.6%	0.9%
Asian alone	193 ±95	2.4% ±1.2 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	232 ±145 · low precision	2.9% ±1.8 pp · low precision	7.9%	7.1%
Two or more races	882 ±301	11.0% ±3.8 pp	10.9%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 8,014
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Not Hispanic or Latino	6,562 ±475	81.9% ±5.9 pp	81.2%	80.7%
Hispanic or Latino	1,452 ±472	18.1% ±5.9 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: 2,905
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Married-couple family	1,534 ±134	52.8% ±3.4 pp	45.3%	46.9%
Other family: male householder, no spouse present	181 ±91 · low precision	6.2% ±3.1 pp	4.9%	5.1%
Other family: female householder, no spouse present	326 ±103	11.2% ±3.5 pp	11.9%	12.2%
Nonfamily: householder living alone	619 ±153	21.3% ±5.1 pp	31.2%	28.7%
Nonfamily: householder not living alone	245 ±126 · low precision	8.4% ±4.3 pp · low precision	6.7%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 2,905
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Households with people under 18	1,024 ±140	35.2% ±4.3 pp	28.6%	29.5%
Households without people under 18	1,881 ±252	64.8% ±7.8 pp	71.4%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 2,905
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
One-person nonfamily households	619 ±153	21.3% ±5.1 pp	31.2%	28.7%
Two-person households	930 ±211	32.0% ±7.0 pp	32.3%	33.8%
Three-person households	489 ±126	16.8% ±4.2 pp	14.7%	15.3%
Four-person households	501 ±160	17.2% ±5.4 pp	12.6%	12.6%
Five-person households	252 ±91	8.7% ±3.1 pp	5.8%	5.9%
Six-person households	96 ±83 · low precision	3.3% ±2.8 pp · low precision	2.1%	2.2%
Seven or more people	18 ±28 · low precision	0.6% ±1.0 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: 8,014
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Native	7,019 ±283	87.6% ±3.5 pp	85.3%	85.9%
Foreign born	995 ±280	12.4% ±3.5 pp	14.7%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 7,491
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
English only	5,886 ±449	78.6% ±5.4 pp	76.0%	77.7%
Spanish	1,110 ±435	14.8% ±5.8 pp	14.0%	13.6%
French, Haitian, or Cajun	0 ±18 · low precision	0.0% ±0.2 pp · low precision	0.3%	0.7%
German or other West Germanic	10 ±15 · low precision	0.1% ±0.2 pp · low precision	0.3%	0.5%
Russian, Polish, or other Slavic	258 ±151 · low precision	3.4% ±2.0 pp · low precision	2.5%	0.7%
Other Indo-European	65 ±57 · low precision	0.9% ±0.8 pp · low precision	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	24 ±32 · low precision	0.3% ±0.4 pp · low precision	0.9%	1.1%
Vietnamese	0 ±18 · low precision	0.0% ±0.2 pp · low precision	0.2%	0.5%
Tagalog, including Filipino	49 ±46 · low precision	0.7% ±0.6 pp · low precision	0.7%	0.6%
Other Asian and Pacific Island	65 ±58 · low precision	0.9% ±0.8 pp · low precision	1.0%	1.1%
Arabic	0 ±18 · low precision	0.0% ±0.2 pp · low precision	0.6%	0.5%
Other and unspecified	24 ±36 · low precision	0.3% ±0.5 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: 5,481
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Less than high school graduate	489 ±160	8.9% ±2.9 pp	9.5%	10.4%
High school graduate or equivalency	1,466 ±241	26.7% ±4.2 pp	25.1%	26.0%
Some college, no degree	1,285 ±198	23.4% ±3.4 pp	19.2%	19.1%
Associate’s degree	574 ±179	10.5% ±3.2 pp	8.3%	8.8%
Bachelor’s degree	1,252 ±202	22.8% ±3.5 pp	22.6%	21.6%
Graduate or professional degree	415 ±123	7.6% ±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: 7,985
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Same house	7,655 ±149	95.9% ±1.7 pp	88.9%	87.7%
Moved within same county	143 ±103 · low precision	1.8% ±1.3 pp · low precision	6.4%	6.3%
Moved from a different county in the same state	146 ±86 · low precision	1.8% ±1.1 pp · low precision	2.4%	3.1%
Moved from a different state	22 ±24 · low precision	0.3% ±0.3 pp · low precision	1.6%	2.3%
Moved from abroad	19 ±28 · low precision	0.2% ±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

6.4% of Island Lake residents (±2.1 percentage points) had no health insurance coverage when surveyed, compared with 6.9% in Illinois and 8.4% nationally. 98.6% 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	Island Lake	Illinois	U.S.	Compared with Illinois
People without health insurance Civilian noninstitutionalized population	6.4% ±2.1 pp	6.9%	8.4%	Not statistically different
Households with a broadband subscription Households	98.6% ±8.1 pp	90.8%	91.0%	Not statistically different
Veterans Civilian population age 18 and older	5.2% ±1.4 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 Island Lake . 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 Island Lake housing and cost context or return to the city profile.