Auburn, Illinois demographics

Auburn, IL demographics: median age 40.1; 27.6% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Auburn city, Illinois · Incorporated city · GEOID 1702921. The survey estimates a population of 4,306 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Auburn is 40.1 years, with a 90% margin of error of 9.8 years. There are 1,685 households (±195). 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	40.1 ±9.8	39.0 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 4,306
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Under 18	1,060 ±310	24.6% ±6.5 pp	21.8%	22.0%
18–34	758 ±219	17.6% ±4.6 pp	22.7%	22.8%
35–64	1,782 ±336	41.4% ±5.9 pp	38.5%	38.0%
65 and older	706 ±222	16.4% ±4.7 pp	17.0%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 4,306
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Male	2,021 ±279	46.9% ±3.0 pp	49.4%	49.5%
Female	2,285 ±351	53.1% ±4.9 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: 4,306
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
White alone	4,158 ±536	96.6% ±3.8 pp	61.0%	61.0%
Black or African American alone	39 ±68 · low precision	0.9% ±1.6 pp · low precision	13.6%	12.2%
American Indian and Alaska Native alone	0 ±13 · low precision	0.0% ±0.3 pp · low precision	0.6%	0.9%
Asian alone	0 ±13 · low precision	0.0% ±0.3 pp · low precision	6.0%	6.0%
Native Hawaiian and Other Pacific Islander alone	0 ±13 · low precision	0.0% ±0.3 pp · low precision	0.0%	0.2%
Some other race alone	0 ±13 · low precision	0.0% ±0.3 pp · low precision	7.9%	7.1%
Two or more races	109 ±96 · low precision	2.5% ±2.2 pp · low precision	10.9%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 4,306
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Not Hispanic or Latino	4,071 ±507	94.5% ±2.1 pp	81.2%	80.7%
Hispanic or Latino	235 ±184 · low precision	5.5% ±4.2 pp · low precision	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: 1,685
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Married-couple family	775 ±157	46.0% ±7.6 pp	45.3%	46.9%
Other family: male householder, no spouse present	94 ±91 · low precision	5.6% ±5.4 pp · low precision	4.9%	5.1%
Other family: female householder, no spouse present	265 ±159 · low precision	15.7% ±9.3 pp · low precision	11.9%	12.2%
Nonfamily: householder living alone	444 ±175	26.4% ±9.9 pp	31.2%	28.7%
Nonfamily: householder not living alone	107 ±76 · low precision	6.4% ±4.5 pp · low precision	6.7%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 1,685
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Households with people under 18	375 ±119	22.3% ±6.6 pp	28.6%	29.5%
Households without people under 18	1,310 ±214	77.7% ±9.0 pp	71.4%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 1,685
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
One-person nonfamily households	444 ±175	26.4% ±9.9 pp	31.2%	28.7%
Two-person households	723 ±158	42.9% ±8.0 pp	32.3%	33.8%
Three-person households	254 ±154 · low precision	15.1% ±8.9 pp · low precision	14.7%	15.3%
Four-person households	111 ±66 · low precision	6.6% ±3.9 pp · low precision	12.6%	12.6%
Five-person households	49 ±47 · low precision	2.9% ±2.8 pp · low precision	5.8%	5.9%
Six-person households	32 ±35 · low precision	1.9% ±2.0 pp · low precision	2.1%	2.2%
Seven or more people	72 ±88 · low precision	4.3% ±5.2 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: 4,306
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Native	4,306 ±528	100.0% ±0.0 pp	85.3%	85.9%
Foreign born	0 ±13 · low precision	0.0% ±0.3 pp · low precision	14.7%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 4,100
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
English only	4,015 ±418	97.9% ±14.9 pp	76.0%	77.7%
Spanish	74 ±99 · low precision	1.8% ±2.4 pp · low precision	14.0%	13.6%
French, Haitian, or Cajun	0 ±13 · low precision	0.0% ±0.3 pp · low precision	0.3%	0.7%
German or other West Germanic	0 ±13 · low precision	0.0% ±0.3 pp · low precision	0.3%	0.5%
Russian, Polish, or other Slavic	11 ±19 · low precision	0.3% ±0.5 pp · low precision	2.5%	0.7%
Other Indo-European	0 ±13 · low precision	0.0% ±0.3 pp · low precision	2.6%	2.0%
Korean	0 ±13 · low precision	0.0% ±0.3 pp · low precision	0.3%	0.3%
Chinese, including Mandarin and Cantonese	0 ±13 · low precision	0.0% ±0.3 pp · low precision	0.9%	1.1%
Vietnamese	0 ±13 · low precision	0.0% ±0.3 pp · low precision	0.2%	0.5%
Tagalog, including Filipino	0 ±13 · low precision	0.0% ±0.3 pp · low precision	0.7%	0.6%
Other Asian and Pacific Island	0 ±13 · low precision	0.0% ±0.3 pp · low precision	1.0%	1.1%
Arabic	0 ±13 · low precision	0.0% ±0.3 pp · low precision	0.6%	0.5%
Other and unspecified	0 ±13 · low precision	0.0% ±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: 2,958
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Less than high school graduate	76 ±87 · low precision	2.6% ±2.9 pp · low precision	9.5%	10.4%
High school graduate or equivalency	1,058 ±356	35.8% ±11.3 pp	25.1%	26.0%
Some college, no degree	791 ±223	26.7% ±6.9 pp	19.2%	19.1%
Associate’s degree	216 ±109 · low precision	7.3% ±3.6 pp	8.3%	8.8%
Bachelor’s degree	496 ±210	16.8% ±6.8 pp	22.6%	21.6%
Graduate or professional degree	321 ±139	10.9% ±4.5 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: 4,292
Category	Count ± MOE	Share ± MOE (pp)	Illinois	U.S.
Same house	4,098 ±540	95.5% ±4.5 pp	88.9%	87.7%
Moved within same county	156 ±136 · low precision	3.6% ±3.1 pp · low precision	6.4%	6.3%
Moved from a different county in the same state	29 ±39 · low precision	0.7% ±0.9 pp · low precision	2.4%	3.1%
Moved from a different state	9 ±15 · low precision	0.2% ±0.3 pp · low precision	1.6%	2.3%
Moved from abroad	0 ±13 · low precision	0.0% ±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

4.1% of Auburn residents (±2.9 percentage points) had no health insurance coverage when surveyed, compared with 6.9% in Illinois and 8.4% nationally. 90.6% 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	Auburn	Illinois	U.S.	Compared with Illinois
People without health insurance Civilian noninstitutionalized population	4.1% ±2.9 pp · low precision	6.9%	8.4%	Not statistically different
Households with a broadband subscription Households	90.6% ±9.1 pp	90.8%	91.0%	Not statistically different
Veterans Civilian population age 18 and older	5.6% ±3.2 pp · low precision	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 Auburn . 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 Auburn housing and cost context or return to the city profile.