Alamosa, Colorado demographics

Alamosa, CO demographics: median age 31.2; 33.3% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Alamosa city, Colorado · Incorporated city · GEOID 0801090. The survey estimates a population of 9,879 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Alamosa is 31.2 years, with a 90% margin of error of 1.7 years. There are 4,084 households (±199). 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	31.2 ±1.7	37.7 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 9,879
Category	Count ± MOE	Share ± MOE (pp)	Colorado	U.S.
Under 18	2,545 ±327	25.8% ±3.3 pp	21.0%	22.0%
18–34	2,994 ±492	30.3% ±5.0 pp	24.8%	22.8%
35–64	3,031 ±397	30.7% ±4.0 pp	38.6%	38.0%
65 and older	1,309 ±251	13.3% ±2.5 pp	15.6%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 9,879
Category	Count ± MOE	Share ± MOE (pp)	Colorado	U.S.
Male	4,966 ±278	50.3% ±2.8 pp	50.7%	49.5%
Female	4,913 ±278	49.7% ±2.8 pp	49.3%	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: 9,879
Category	Count ± MOE	Share ± MOE (pp)	Colorado	U.S.
White alone	5,381 ±542	54.5% ±5.5 pp	70.5%	61.0%
Black or African American alone	184 ±99 · low precision	1.9% ±1.0 pp · low precision	4.0%	12.2%
American Indian and Alaska Native alone	410 ±220 · low precision	4.2% ±2.2 pp · low precision	1.1%	0.9%
Asian alone	164 ±47	1.7% ±0.5 pp	3.3%	6.0%
Native Hawaiian and Other Pacific Islander alone	13 ±23 · low precision	0.1% ±0.2 pp · low precision	0.2%	0.2%
Some other race alone	919 ±472 · low precision	9.3% ±4.8 pp · low precision	6.0%	7.1%
Two or more races	2,808 ±531	28.4% ±5.4 pp	14.9%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 9,879
Category	Count ± MOE	Share ± MOE (pp)	Colorado	U.S.
Not Hispanic or Latino	4,545 ±409	46.0% ±4.1 pp	77.5%	80.7%
Hispanic or Latino	5,334 ±409	54.0% ±4.1 pp	22.5%	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: 4,084
Category	Count ± MOE	Share ± MOE (pp)	Colorado	U.S.
Married-couple family	1,224 ±224	30.0% ±5.3 pp	48.3%	46.9%
Other family: male householder, no spouse present	359 ±174	8.8% ±4.2 pp	4.5%	5.1%
Other family: female householder, no spouse present	461 ±163	11.3% ±4.0 pp	8.9%	12.2%
Nonfamily: householder living alone	1,627 ±304	39.8% ±7.2 pp	28.6%	28.7%
Nonfamily: householder not living alone	413 ±199	10.1% ±4.8 pp	9.7%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 4,084
Category	Count ± MOE	Share ± MOE (pp)	Colorado	U.S.
Households with people under 18	1,221 ±246	29.9% ±5.8 pp	28.4%	29.5%
Households without people under 18	2,863 ±301	70.1% ±6.5 pp	71.6%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 4,084
Category	Count ± MOE	Share ± MOE (pp)	Colorado	U.S.
One-person nonfamily households	1,627 ±304	39.8% ±7.2 pp	28.6%	28.7%
Two-person households	1,071 ±270	26.2% ±6.5 pp	36.0%	33.8%
Three-person households	574 ±201	14.1% ±4.9 pp	14.8%	15.3%
Four-person households	665 ±217	16.3% ±5.2 pp	12.3%	12.6%
Five-person households	113 ±71 · low precision	2.8% ±1.7 pp · low precision	5.1%	5.9%
Six-person households	0 ±27 · low precision	0.0% ±0.7 pp · low precision	2.0%	2.2%
Seven or more people	34 ±50 · low precision	0.8% ±1.2 pp · low precision	1.1%	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: 9,879
Category	Count ± MOE	Share ± MOE (pp)	Colorado	U.S.
Native	9,207 ±215	93.2% ±2.2 pp	90.2%	85.9%
Foreign born	672 ±216	6.8% ±2.2 pp	9.8%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 9,398
Category	Count ± MOE	Share ± MOE (pp)	Colorado	U.S.
English only	7,300 ±461	77.7% ±4.8 pp	83.8%	77.7%
Spanish	1,827 ±427	19.4% ±4.5 pp	11.1%	13.6%
French, Haitian, or Cajun	6 ±10 · low precision	0.1% ±0.1 pp · low precision	0.4%	0.7%
German or other West Germanic	8 ±19 · low precision	0.1% ±0.2 pp · low precision	0.4%	0.5%
Russian, Polish, or other Slavic	0 ±19 · low precision	0.0% ±0.2 pp · low precision	0.6%	0.7%
Other Indo-European	10 ±19 · low precision	0.1% ±0.2 pp · low precision	1.0%	2.0%
Korean	3 ±10 · low precision	0.0% ±0.1 pp · low precision	0.2%	0.3%
Chinese, including Mandarin and Cantonese	96 ±67 · low precision	1.0% ±0.7 pp · low precision	0.5%	1.1%
Vietnamese	17 ±31 · low precision	0.2% ±0.3 pp · low precision	0.4%	0.5%
Tagalog, including Filipino	0 ±19 · low precision	0.0% ±0.2 pp · low precision	0.2%	0.6%
Other Asian and Pacific Island	69 ±64 · low precision	0.7% ±0.7 pp · low precision	0.6%	1.1%
Arabic	27 ±41 · low precision	0.3% ±0.4 pp · low precision	0.2%	0.5%
Other and unspecified	35 ±35 · low precision	0.4% ±0.4 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: 5,636
Category	Count ± MOE	Share ± MOE (pp)	Colorado	U.S.
Less than high school graduate	601 ±229	10.7% ±4.0 pp	7.1%	10.4%
High school graduate or equivalency	1,322 ±314	23.5% ±5.4 pp	19.7%	26.0%
Some college, no degree	1,302 ±309	23.1% ±5.4 pp	19.2%	19.1%
Associate’s degree	535 ±196	9.5% ±3.4 pp	8.3%	8.8%
Bachelor’s degree	862 ±263	15.3% ±4.6 pp	28.1%	21.6%
Graduate or professional degree	1,014 ±249	18.0% ±4.3 pp	17.6%	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: 9,844
Category	Count ± MOE	Share ± MOE (pp)	Colorado	U.S.
Same house	7,590 ±508	77.1% ±5.1 pp	84.1%	87.7%
Moved within same county	845 ±342	8.6% ±3.5 pp	6.7%	6.3%
Moved from a different county in the same state	803 ±407 · low precision	8.2% ±4.1 pp · low precision	4.8%	3.1%
Moved from a different state	557 ±186	5.7% ±1.9 pp	3.8%	2.3%
Moved from abroad	49 ±28 · low precision	0.5% ±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

4.9% of Alamosa residents (±1.9 percentage points) had no health insurance coverage when surveyed, compared with 7.7% in Colorado and 8.4% nationally. 90.8% 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	Alamosa	Colorado	U.S.	Compared with Colorado
People without health insurance Civilian noninstitutionalized population	4.9% ±1.9 pp	7.7%	8.4%	Lower
Households with a broadband subscription Households	90.8% ±4.7 pp	93.5%	91.0%	Not statistically different
Veterans Civilian population age 18 and older	2.8% ±1.4 pp	7.5%	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 Alamosa . 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 Alamosa housing and cost context or return to the city profile.