Decatur, Indiana demographics

Decatur, IN demographics: median age 44.6; 12.3% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Decatur city, Indiana · Incorporated city · GEOID 1817074. The survey estimates a population of 9,811 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Decatur is 44.6 years, with a 90% margin of error of 2.9 years. There are 4,389 households (±317). 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	44.6 ±2.9	38.1 ±0.2	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 9,811
Category	Count ± MOE	Share ± MOE (pp)	Indiana	U.S.
Under 18	1,931 ±318	19.7% ±3.0 pp	23.3%	22.0%
18–34	2,085 ±322	21.3% ±3.0 pp	22.8%	22.8%
35–64	3,795 ±398	38.7% ±3.2 pp	37.2%	38.0%
65 and older	2,000 ±300	20.4% ±2.8 pp	16.8%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 9,811
Category	Count ± MOE	Share ± MOE (pp)	Indiana	U.S.
Male	4,637 ±326	47.3% ±1.2 pp	49.6%	49.5%
Female	5,174 ±473	52.7% ±3.4 pp	50.4%	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: 9,811
Category	Count ± MOE	Share ± MOE (pp)	Indiana	U.S.
White alone	8,874 ±584	90.4% ±0.8 pp	77.1%	61.0%
Black or African American alone	68 ±58 · low precision	0.7% ±0.6 pp · low precision	9.2%	12.2%
American Indian and Alaska Native alone	0 ±18 · low precision	0.0% ±0.2 pp · low precision	0.3%	0.9%
Asian alone	2 ±5 · low precision	0.0% ±0.1 pp · low precision	2.6%	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	291 ±128	3.0% ±1.3 pp	3.4%	7.1%
Two or more races	576 ±209	5.9% ±2.1 pp	7.3%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 9,811
Category	Count ± MOE	Share ± MOE (pp)	Indiana	U.S.
Not Hispanic or Latino	8,861 ±602	90.3% ±1.7 pp	91.4%	80.7%
Hispanic or Latino	950 ±234	9.7% ±2.3 pp	8.6%	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: 4,389
Category	Count ± MOE	Share ± MOE (pp)	Indiana	U.S.
Married-couple family	1,791 ±255	40.8% ±5.0 pp	47.3%	46.9%
Other family: male householder, no spouse present	119 ±64 · low precision	2.7% ±1.4 pp · low precision	5.1%	5.1%
Other family: female householder, no spouse present	478 ±164	10.9% ±3.7 pp	11.3%	12.2%
Nonfamily: householder living alone	1,641 ±292	37.4% ±6.1 pp	29.6%	28.7%
Nonfamily: householder not living alone	360 ±130	8.2% ±2.9 pp	6.7%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 4,389
Category	Count ± MOE	Share ± MOE (pp)	Indiana	U.S.
Households with people under 18	1,009 ±203	23.0% ±4.3 pp	29.9%	29.5%
Households without people under 18	3,380 ±330	77.0% ±5.1 pp	70.1%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 4,389
Category	Count ± MOE	Share ± MOE (pp)	Indiana	U.S.
One-person nonfamily households	1,641 ±292	37.4% ±6.1 pp	29.6%	28.7%
Two-person households	1,471 ±249	33.5% ±5.1 pp	34.9%	33.8%
Three-person households	660 ±175	15.0% ±3.8 pp	14.5%	15.3%
Four-person households	391 ±161	8.9% ±3.6 pp	11.9%	12.6%
Five-person households	24 ±35 · low precision	0.5% ±0.8 pp · low precision	5.8%	5.9%
Six-person households	185 ±133 · low precision	4.2% ±3.0 pp · low precision	2.1%	2.2%
Seven or more people	17 ±33 · low precision	0.4% ±0.8 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: 9,811
Category	Count ± MOE	Share ± MOE (pp)	Indiana	U.S.
Native	9,641 ±625	98.3% ±9.0 pp	93.7%	85.9%
Foreign born	170 ±115 · low precision	1.7% ±1.2 pp · low precision	6.3%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 8,960
Category	Count ± MOE	Share ± MOE (pp)	Indiana	U.S.
English only	8,667 ±521	96.7% ±0.8 pp	89.7%	77.7%
Spanish	226 ±122 · low precision	2.5% ±1.4 pp · low precision	5.5%	13.6%
French, Haitian, or Cajun	0 ±18 · low precision	0.0% ±0.2 pp · low precision	0.4%	0.7%
German or other West Germanic	38 ±43 · low precision	0.4% ±0.5 pp · low precision	1.1%	0.5%
Russian, Polish, or other Slavic	0 ±18 · low precision	0.0% ±0.2 pp · low precision	0.3%	0.7%
Other Indo-European	29 ±41 · low precision	0.3% ±0.5 pp · low precision	0.9%	2.0%
Korean	0 ±18 · low precision	0.0% ±0.2 pp · low precision	0.1%	0.3%
Chinese, including Mandarin and Cantonese	0 ±18 · low precision	0.0% ±0.2 pp · low precision	0.4%	1.1%
Vietnamese	0 ±18 · low precision	0.0% ±0.2 pp · low precision	0.1%	0.5%
Tagalog, including Filipino	0 ±18 · low precision	0.0% ±0.2 pp · low precision	0.2%	0.6%
Other Asian and Pacific Island	0 ±18 · low precision	0.0% ±0.2 pp · low precision	0.8%	1.1%
Arabic	0 ±18 · low precision	0.0% ±0.2 pp · low precision	0.2%	0.5%
Other and unspecified	0 ±18 · low precision	0.0% ±0.2 pp · low precision	0.5%	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: 7,014
Category	Count ± MOE	Share ± MOE (pp)	Indiana	U.S.
Less than high school graduate	431 ±154	6.1% ±2.2 pp	9.6%	10.4%
High school graduate or equivalency	3,498 ±437	49.9% ±5.3 pp	32.5%	26.0%
Some college, no degree	1,328 ±335	18.9% ±4.6 pp	19.3%	19.1%
Associate’s degree	895 ±282	12.8% ±3.9 pp	9.1%	8.8%
Bachelor’s degree	621 ±183	8.9% ±2.5 pp	18.7%	21.6%
Graduate or professional degree	241 ±107	3.4% ±1.5 pp	10.8%	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: 9,594
Category	Count ± MOE	Share ± MOE (pp)	Indiana	U.S.
Same house	7,634 ±658	79.6% ±4.7 pp	87.3%	87.7%
Moved within same county	916 ±327	9.5% ±3.4 pp	6.5%	6.3%
Moved from a different county in the same state	349 ±204 · low precision	3.6% ±2.1 pp · low precision	3.6%	3.1%
Moved from a different state	695 ±499 · low precision	7.2% ±5.2 pp · low precision	2.1%	2.3%
Moved from abroad	0 ±18 · low precision	0.0% ±0.2 pp · low precision	0.4%	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

8.6% of Decatur residents (±3.2 percentage points) had no health insurance coverage when surveyed, compared with 7.4% in Indiana and 8.4% nationally. 86.9% 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	Decatur	Indiana	U.S.	Compared with Indiana
People without health insurance Civilian noninstitutionalized population	8.6% ±3.2 pp	7.4%	8.4%	Not statistically different
Households with a broadband subscription Households	86.9% ±3.2 pp	89.9%	91.0%	Not statistically different
Veterans Civilian population age 18 and older	4.1% ±1.4 pp	6.3%	6.2%	Lower

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