Belvidere, Illinois demographics

Belvidere, IL demographics: median age 38.7; 12.8% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Belvidere city, Illinois · Incorporated city · GEOID 1705092. The survey estimates a population of 24,752 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Belvidere is 38.7 years, with a 90% margin of error of 2.0 years. There are 9,589 households (±364). 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	38.7 ±2.0	39.0 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 24,752
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Under 18	5,764 ±576	23.3% ±2.3 pp	21.8%	22.0%
18–34	5,393 ±569	21.8% ±2.2 pp	22.7%	22.8%
35–64	9,566 ±719	38.6% ±2.8 pp	38.5%	38.0%
65 and older	4,029 ±490	16.3% ±1.9 pp	17.0%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 24,752
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Male	12,480 ±440	50.4% ±1.4 pp	49.4%	49.5%
Female	12,272 ±480	49.6% ±1.6 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: 24,752
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
White alone	15,404 ±1,068	62.2% ±4.1 pp	61.0%	61.0%
Black or African American alone	838 ±418	3.4% ±1.7 pp	13.6%	12.2%
American Indian and Alaska Native alone	96 ±86 · low precision	0.4% ±0.3 pp · low precision	0.6%	0.9%
Asian alone	273 ±204 · low precision	1.1% ±0.8 pp · low precision	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	5,754 ±1,128	23.2% ±4.5 pp	7.9%	7.1%
Two or more races	2,387 ±685	9.6% ±2.8 pp	10.9%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 24,752
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Not Hispanic or Latino	16,023 ±956	64.7% ±3.6 pp	81.2%	80.7%
Hispanic or Latino	8,729 ±766	35.3% ±3.0 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: 9,589
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Married-couple family	3,701 ±437	38.6% ±4.3 pp	45.3%	46.9%
Other family: male householder, no spouse present	665 ±237	6.9% ±2.5 pp	4.9%	5.1%
Other family: female householder, no spouse present	1,775 ±343	18.5% ±3.5 pp	11.9%	12.2%
Nonfamily: householder living alone	2,671 ±441	27.9% ±4.5 pp	31.2%	28.7%
Nonfamily: householder not living alone	777 ±287	8.1% ±3.0 pp	6.7%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 9,589
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Households with people under 18	3,027 ±326	31.6% ±3.2 pp	28.6%	29.5%
Households without people under 18	6,562 ±474	68.4% ±4.2 pp	71.4%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 9,589
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
One-person nonfamily households	2,671 ±441	27.9% ±4.5 pp	31.2%	28.7%
Two-person households	3,140 ±458	32.7% ±4.6 pp	32.3%	33.8%
Three-person households	1,790 ±334	18.7% ±3.4 pp	14.7%	15.3%
Four-person households	1,140 ±303	11.9% ±3.1 pp	12.6%	12.6%
Five-person households	488 ±162	5.1% ±1.7 pp	5.8%	5.9%
Six-person households	231 ±112	2.4% ±1.2 pp	2.1%	2.2%
Seven or more people	129 ±121 · low precision	1.3% ±1.3 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: 24,752
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Native	20,881 ±889	84.4% ±3.0 pp	85.3%	85.9%
Foreign born	3,871 ±710	15.6% ±2.8 pp	14.7%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 23,514
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
English only	17,043 ±1,222	72.5% ±4.9 pp	76.0%	77.7%
Spanish	5,937 ±1,001	25.2% ±4.2 pp	14.0%	13.6%
French, Haitian, or Cajun	10 ±20 · low precision	0.0% ±0.1 pp · low precision	0.3%	0.7%
German or other West Germanic	60 ±68 · low precision	0.3% ±0.3 pp · low precision	0.3%	0.5%
Russian, Polish, or other Slavic	52 ±72 · low precision	0.2% ±0.3 pp · low precision	2.5%	0.7%
Other Indo-European	193 ±191 · low precision	0.8% ±0.8 pp · low precision	2.6%	2.0%
Korean	0 ±24 · low precision	0.0% ±0.1 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	0 ±24 · low precision	0.0% ±0.1 pp · low precision	0.2%	0.5%
Tagalog, including Filipino	0 ±24 · low precision	0.0% ±0.1 pp · low precision	0.7%	0.6%
Other Asian and Pacific Island	0 ±24 · low precision	0.0% ±0.1 pp · low precision	1.0%	1.1%
Arabic	193 ±236 · low precision	0.8% ±1.0 pp · low precision	0.6%	0.5%
Other and unspecified	26 ±38 · low precision	0.1% ±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: 16,487
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Less than high school graduate	3,417 ±627	20.7% ±3.7 pp	9.5%	10.4%
High school graduate or equivalency	5,232 ±581	31.7% ±3.4 pp	25.1%	26.0%
Some college, no degree	4,183 ±613	25.4% ±3.6 pp	19.2%	19.1%
Associate’s degree	1,541 ±431	9.3% ±2.6 pp	8.3%	8.8%
Bachelor’s degree	1,304 ±306	7.9% ±1.8 pp	22.6%	21.6%
Graduate or professional degree	810 ±251	4.9% ±1.5 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: 24,439
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Same house	22,633 ±791	92.6% ±2.4 pp	88.9%	87.7%
Moved within same county	637 ±305	2.6% ±1.2 pp	6.4%	6.3%
Moved from a different county in the same state	933 ±389	3.8% ±1.6 pp	2.4%	3.1%
Moved from a different state	211 ±154 · low precision	0.9% ±0.6 pp · low precision	1.6%	2.3%
Moved from abroad	25 ±69 · low precision	0.1% ±0.3 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

7.9% of Belvidere residents (±2.0 percentage points) had no health insurance coverage when surveyed, compared with 6.9% in Illinois and 8.4% nationally. 89.2% 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	Belvidere	Illinois	U.S.	Compared with Illinois
People without health insurance Civilian noninstitutionalized population	7.9% ±2.0 pp	6.9%	8.4%	Not statistically different
Households with a broadband subscription Households	89.2% ±2.4 pp	90.8%	91.0%	Not statistically different
Veterans Civilian population age 18 and older	5.2% ±1.5 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 Belvidere . 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 Belvidere housing and cost context or return to the city profile.