McHenry, Illinois demographics

McHenry, IL demographics: median age 43.9; 25.7% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · McHenry city, Illinois · Incorporated city · GEOID 1745694. The survey estimates a population of 28,074 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in McHenry is 43.9 years, with a 90% margin of error of 2.1 years. There are 11,897 households (±498). 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	43.9 ±2.1	39.0 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 28,074
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Under 18	5,569 ±649	19.8% ±2.3 pp	21.8%	22.0%
18–34	5,530 ±611	19.7% ±2.2 pp	22.7%	22.8%
35–64	11,569 ±831	41.2% ±3.0 pp	38.5%	38.0%
65 and older	5,406 ±599	19.3% ±2.1 pp	17.0%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 28,074
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Male	13,975 ±595	49.8% ±2.1 pp	49.4%	49.5%
Female	14,099 ±587	50.2% ±2.1 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: 28,074
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
White alone	23,499 ±746	83.7% ±2.7 pp	61.0%	61.0%
Black or African American alone	158 ±138 · low precision	0.6% ±0.5 pp · low precision	13.6%	12.2%
American Indian and Alaska Native alone	73 ±88 · low precision	0.3% ±0.3 pp · low precision	0.6%	0.9%
Asian alone	485 ±263 · low precision	1.7% ±0.9 pp · low precision	6.0%	6.0%
Native Hawaiian and Other Pacific Islander alone	19 ±30 · low precision	0.1% ±0.1 pp · low precision	0.0%	0.2%
Some other race alone	1,107 ±411	3.9% ±1.5 pp	7.9%	7.1%
Two or more races	2,733 ±610	9.7% ±2.2 pp	10.9%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 28,074
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Not Hispanic or Latino	23,631 ±755	84.2% ±2.7 pp	81.2%	80.7%
Hispanic or Latino	4,443 ±757	15.8% ±2.7 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: 11,897
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Married-couple family	5,756 ±361	48.4% ±2.3 pp	45.3%	46.9%
Other family: male householder, no spouse present	512 ±205	4.3% ±1.7 pp	4.9%	5.1%
Other family: female householder, no spouse present	1,194 ±251	10.0% ±2.1 pp	11.9%	12.2%
Nonfamily: householder living alone	3,630 ±487	30.5% ±3.9 pp	31.2%	28.7%
Nonfamily: householder not living alone	805 ±282	6.8% ±2.4 pp	6.7%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 11,897
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Households with people under 18	2,963 ±329	24.9% ±2.6 pp	28.6%	29.5%
Households without people under 18	8,934 ±645	75.1% ±4.4 pp	71.4%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 11,897
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
One-person nonfamily households	3,630 ±487	30.5% ±3.9 pp	31.2%	28.7%
Two-person households	4,447 ±520	37.4% ±4.1 pp	32.3%	33.8%
Three-person households	1,580 ±315	13.3% ±2.6 pp	14.7%	15.3%
Four-person households	1,567 ±272	13.2% ±2.2 pp	12.6%	12.6%
Five-person households	442 ±170	3.7% ±1.4 pp	5.8%	5.9%
Six-person households	201 ±105 · low precision	1.7% ±0.9 pp · low precision	2.1%	2.2%
Seven or more people	30 ±38 · low precision	0.3% ±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: 28,074
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Native	25,707 ±506	91.6% ±1.8 pp	85.3%	85.9%
Foreign born	2,367 ±511	8.4% ±1.8 pp	14.7%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 26,679
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
English only	22,922 ±736	85.9% ±2.6 pp	76.0%	77.7%
Spanish	2,688 ±501	10.1% ±1.9 pp	14.0%	13.6%
French, Haitian, or Cajun	65 ±65 · low precision	0.2% ±0.2 pp · low precision	0.3%	0.7%
German or other West Germanic	54 ±41 · low precision	0.2% ±0.2 pp · low precision	0.3%	0.5%
Russian, Polish, or other Slavic	517 ±410 · low precision	1.9% ±1.5 pp · low precision	2.5%	0.7%
Other Indo-European	173 ±147 · low precision	0.6% ±0.6 pp · low precision	2.6%	2.0%
Korean	27 ±42 · low precision	0.1% ±0.2 pp · low precision	0.3%	0.3%
Chinese, including Mandarin and Cantonese	0 ±24 · low precision	0.0% ±0.1 pp · low precision	0.9%	1.1%
Vietnamese	63 ±97 · low precision	0.2% ±0.4 pp · low precision	0.2%	0.5%
Tagalog, including Filipino	80 ±75 · low precision	0.3% ±0.3 pp · low precision	0.7%	0.6%
Other Asian and Pacific Island	30 ±36 · low precision	0.1% ±0.1 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	60 ±69 · low precision	0.2% ±0.3 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: 20,808
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Less than high school graduate	1,745 ±436	8.4% ±2.1 pp	9.5%	10.4%
High school graduate or equivalency	6,839 ±707	32.9% ±3.3 pp	25.1%	26.0%
Some college, no degree	5,255 ±683	25.3% ±3.2 pp	19.2%	19.1%
Associate’s degree	1,630 ±349	7.8% ±1.7 pp	8.3%	8.8%
Bachelor’s degree	3,736 ±636	18.0% ±3.0 pp	22.6%	21.6%
Graduate or professional degree	1,603 ±333	7.7% ±1.6 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: 27,810
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Same house	24,257 ±766	87.2% ±2.7 pp	88.9%	87.7%
Moved within same county	1,982 ±593	7.1% ±2.1 pp	6.4%	6.3%
Moved from a different county in the same state	1,221 ±452	4.4% ±1.6 pp	2.4%	3.1%
Moved from a different state	339 ±252 · low precision	1.2% ±0.9 pp · low precision	1.6%	2.3%
Moved from abroad	11 ±18 · low precision	0.0% ±0.1 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

4.7% of McHenry residents (±1.4 percentage points) had no health insurance coverage when surveyed, compared with 6.9% in Illinois and 8.4% nationally. 96.2% 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	McHenry	Illinois	U.S.	Compared with Illinois
People without health insurance Civilian noninstitutionalized population	4.7% ±1.4 pp	6.9%	8.4%	Lower
Households with a broadband subscription Households	96.2% ±0.6 pp	90.8%	91.0%	Higher
Veterans Civilian population age 18 and older	5.5% ±1.2 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 McHenry . 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 McHenry housing and cost context or return to the city profile.