Derby, Connecticut demographics

Derby, CT demographics: median age 46.4; 35.6% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Derby city, Connecticut · Incorporated city · GEOID 0919480. The survey estimates a population of 12,487 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Derby is 46.4 years, with a 90% margin of error of 3.1 years. There are 5,896 households (±324). 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	46.4 ±3.1	41.1 ±0.2	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 12,487
Category	Count ± MOE	Share ± MOE (pp)	Connecticut	U.S.
Under 18	1,825 ±357	14.6% ±2.9 pp	20.2%	22.0%
18–34	2,904 ±487	23.3% ±3.9 pp	21.9%	22.8%
35–64	5,126 ±684	41.1% ±5.5 pp	39.4%	38.0%
65 and older	2,632 ±482	21.1% ±3.9 pp	18.5%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 12,487
Category	Count ± MOE	Share ± MOE (pp)	Connecticut	U.S.
Male	6,036 ±413	48.3% ±3.3 pp	49.1%	49.5%
Female	6,451 ±402	51.7% ±3.2 pp	50.9%	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: 12,487
Category	Count ± MOE	Share ± MOE (pp)	Connecticut	U.S.
White alone	8,097 ±611	64.8% ±4.9 pp	65.1%	61.0%
Black or African American alone	1,498 ±427	12.0% ±3.4 pp	10.6%	12.2%
American Indian and Alaska Native alone	32 ±42 · low precision	0.3% ±0.3 pp · low precision	0.3%	0.9%
Asian alone	313 ±235 · low precision	2.5% ±1.9 pp · low precision	4.8%	6.0%
Native Hawaiian and Other Pacific Islander alone	0 ±21 · low precision	0.0% ±0.2 pp · low precision	0.0%	0.2%
Some other race alone	1,544 ±535	12.4% ±4.3 pp	7.7%	7.1%
Two or more races	1,003 ±305	8.0% ±2.4 pp	11.4%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 12,487
Category	Count ± MOE	Share ± MOE (pp)	Connecticut	U.S.
Not Hispanic or Latino	9,693 ±534	77.6% ±4.3 pp	81.7%	80.7%
Hispanic or Latino	2,794 ±537	22.4% ±4.3 pp	18.3%	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: 5,896
Category	Count ± MOE	Share ± MOE (pp)	Connecticut	U.S.
Married-couple family	1,976 ±352	33.5% ±5.7 pp	46.6%	46.9%
Other family: male householder, no spouse present	370 ±166	6.3% ±2.8 pp	5.0%	5.1%
Other family: female householder, no spouse present	1,000 ±253	17.0% ±4.2 pp	12.7%	12.2%
Nonfamily: householder living alone	2,117 ±392	35.9% ±6.3 pp	29.1%	28.7%
Nonfamily: householder not living alone	433 ±174	7.3% ±2.9 pp	6.7%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 5,896
Category	Count ± MOE	Share ± MOE (pp)	Connecticut	U.S.
Households with people under 18	1,225 ±228	20.8% ±3.7 pp	28.6%	29.5%
Households without people under 18	4,671 ±417	79.2% ±5.6 pp	71.4%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 5,896
Category	Count ± MOE	Share ± MOE (pp)	Connecticut	U.S.
One-person nonfamily households	2,117 ±392	35.9% ±6.3 pp	29.1%	28.7%
Two-person households	2,055 ±399	34.9% ±6.5 pp	33.4%	33.8%
Three-person households	1,133 ±266	19.2% ±4.4 pp	16.4%	15.3%
Four-person households	381 ±126	6.5% ±2.1 pp	13.3%	12.6%
Five-person households	155 ±84 · low precision	2.6% ±1.4 pp · low precision	5.4%	5.9%
Six-person households	32 ±40 · low precision	0.5% ±0.7 pp · low precision	1.7%	2.2%
Seven or more people	23 ±43 · low precision	0.4% ±0.7 pp · low precision	0.9%	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: 12,487
Category	Count ± MOE	Share ± MOE (pp)	Connecticut	U.S.
Native	10,671 ±416	85.5% ±3.3 pp	84.3%	85.9%
Foreign born	1,816 ±419	14.5% ±3.4 pp	15.7%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 12,020
Category	Count ± MOE	Share ± MOE (pp)	Connecticut	U.S.
English only	9,250 ±490	77.0% ±4.0 pp	76.6%	77.7%
Spanish	1,834 ±461	15.3% ±3.8 pp	12.8%	13.6%
French, Haitian, or Cajun	189 ±184 · low precision	1.6% ±1.5 pp · low precision	1.2%	0.7%
German or other West Germanic	52 ±95 · low precision	0.4% ±0.8 pp · low precision	0.3%	0.5%
Russian, Polish, or other Slavic	284 ±220 · low precision	2.4% ±1.8 pp · low precision	1.5%	0.7%
Other Indo-European	229 ±147 · low precision	1.9% ±1.2 pp · low precision	4.0%	2.0%
Korean	17 ±27 · low precision	0.1% ±0.2 pp · low precision	0.2%	0.3%
Chinese, including Mandarin and Cantonese	49 ±56 · low precision	0.4% ±0.5 pp · low precision	0.9%	1.1%
Vietnamese	0 ±21 · low precision	0.0% ±0.2 pp · low precision	0.2%	0.5%
Tagalog, including Filipino	26 ±46 · low precision	0.2% ±0.4 pp · low precision	0.3%	0.6%
Other Asian and Pacific Island	55 ±110 · low precision	0.5% ±0.9 pp · low precision	0.9%	1.1%
Arabic	0 ±21 · low precision	0.0% ±0.2 pp · low precision	0.4%	0.5%
Other and unspecified	35 ±41 · low precision	0.3% ±0.3 pp · low precision	0.7%	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: 9,850
Category	Count ± MOE	Share ± MOE (pp)	Connecticut	U.S.
Less than high school graduate	1,173 ±427	11.9% ±4.3 pp	8.5%	10.4%
High school graduate or equivalency	2,999 ±490	30.4% ±4.8 pp	25.3%	26.0%
Some college, no degree	1,445 ±349	14.7% ±3.5 pp	16.1%	19.1%
Associate’s degree	725 ±244	7.4% ±2.5 pp	7.6%	8.8%
Bachelor’s degree	1,945 ±413	19.7% ±4.1 pp	23.3%	21.6%
Graduate or professional degree	1,563 ±395	15.9% ±4.0 pp	19.2%	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: 12,307
Category	Count ± MOE	Share ± MOE (pp)	Connecticut	U.S.
Same house	11,509 ±335	93.5% ±2.6 pp	89.2%	87.7%
Moved within same county	423 ±245 · low precision	3.4% ±2.0 pp · low precision	5.6%	6.3%
Moved from a different county in the same state	220 ±191 · low precision	1.8% ±1.6 pp · low precision	2.0%	3.1%
Moved from a different state	110 ±77 · low precision	0.9% ±0.6 pp · low precision	2.6%	2.3%
Moved from abroad	45 ±63 · low precision	0.4% ±0.5 pp · low precision	0.7%	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

3.7% of Derby residents (±1.9 percentage points) had no health insurance coverage when surveyed, compared with 5.4% in Connecticut and 8.4% nationally. 90.2% 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	Derby	Connecticut	U.S.	Compared with Connecticut
People without health insurance Civilian noninstitutionalized population	3.7% ±1.9 pp · low precision	5.4%	8.4%	Not statistically different
Households with a broadband subscription Households	90.2% ±3.0 pp	92.2%	91.0%	Not statistically different
Veterans Civilian population age 18 and older	7.4% ±3.0 pp	4.7%	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 Derby . 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 Derby housing and cost context or return to the city profile.