City · Colorado
Alamosa, Colorado
Alamosa, city, in Alamosa County, Colorado. Alamosa had 9,849 residents on July 1, 2025 by the Census Bureau's estimate, up 0.3% since 2020; the 2020 Census counted 9,806 and the ACS 2020-2024 5-year estimates put it at 9,879 (±34). GEOID 0801090.
Residents, July 2025 estimate
9,849
Census Bureau estimate (no margin published)
2020 Census count: 9,806 · ACS 2020-2024: 9,879 ±34
Median household income
$49,688
±$6,281 (90% margin)
Colorado: $95,470
Median home value
$225,200
±$36,648 (90% margin)
Colorado: $539,400
Median gross rent
$837
±$121 (90% margin)
Colorado: $1,761
Where is Alamosa and what county is it in?
Alamosa is a city in Alamosa County, Colorado. It covers 8.0 square miles of land, 1,231 residents per square mile in 2020.
Alamosa is in the Alamosa, CO micropolitan statistical area, which takes in 3 counties (Census Bureau delineation, July 2023).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Alamosa, and is it growing?
The Census Bureau estimates that 9,849 people lived in Alamosa on July 1, 2025, up 0.3% since 2020, slower than Colorado (+4.1%). The 2020 Census counted 9,806 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 9,879 (±34).
| Measure | Alamosa | Alamosa County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 9,879 ±34 | 16,581 | +438 |
| Households | 4,084 ±199 | 6,648 | no clear change |
| Average household size | 2.20 ±0.11 | 2.35 | no clear change |
| Housing units | 4,464 ±177 | 7,241 | no clear change |
Alamosa's population since 2000
From 7,960 in 2000 to 9,849 in 2025: up 23.7%. The 2000, 2010 and 2020 figures are census counts, each for Alamosa as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Alamosa?
The median resident of Alamosa is 31.2 years old; 25.8% are under 18 and 13.3% are 65 or older. The largest group is Hispanic or Latino residents (of any race) at 54.0%, then non-Hispanic white residents at 38.5%. 6.8% of residents were born outside the United States.
| Measure | Alamosa | Alamosa County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 31.2 ±1.7 | 33.2 | +2.8 |
| Under 18 years | 25.8% ±1.9 pts | 23.8% | – |
| 65 years and over | 13.3% ±2.0 pts | 15.1% | – |
| Male | 50.3% ±2.8 pts | 49.9% | – |
| Hispanic or Latino (any race) | 54.0% ±4.1 pts | 48.2% | no clear change |
| White alone, not Hispanic | 38.5% ±4.0 pts | 45.2% | no clear change |
| Black or African American alone, not Hispanic | 1.7% ±1.0 pts | 1.7% | – |
| Asian alone, not Hispanic | 1.7% ±0.5 pts | 1.0% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 1.5% ±0.8 pts | 1.0% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.1% ±0.2 pts | 0.1% | – |
| Two or more races, not Hispanic | 2.2% ±1.3 pts | 2.4% | – |
| Some other race alone, not Hispanic | 0.3% ±0.6 pts | 0.4% | – |
| Born outside the United States | 6.8% ±2.2 pts | 5.1% | no clear change |
| Speak a language other than English at home (age 5+) | 22.3% ±4.7 pts | 21.2% | – |
| Civilian veterans (age 18+) | 2.8% ±1.3 pts | 3.4% | – |
| With a disability | 20.7% ±5.3 pts | 19.4% | – |
| No health insurance coverage | 4.9% ±1.8 pts | 5.8% | −9.6 pts |
| High school graduate or higher (age 25+) | 89.3% ±4.0 pts | 88.6% | – |
| Bachelor's degree or higher (age 25+) | 33.3% ±4.8 pts | 32.4% | +9.0 pts |
| Graduate or professional degree (age 25+) | 18.0% ±4.2 pts | 14.9% | – |
| Lived in the same house a year earlier | 77.1% ±5.2 pts | 81.7% | – |
| Moved from another state in the past year | 5.7% ±1.9 pts | 3.9% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Alamosa earn?
Half of Alamosa's 4,084 households earn less than $49,688 a year (±$6,281), against $55,397 in Alamosa County and $95,470 in Colorado. In 2015-2019 it was $43,179 in 2024 dollars; the margins of error cannot tell the two periods apart. 15.9% of residents live below the poverty line.
| Measure | Alamosa | Alamosa County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $49,688 ±$6,281 | $55,397 | no clear change |
| Mean household income | $64,953 ±$7,539 | $73,625 | – |
| Per capita income | $27,208 ±$3,161 | $29,946 | no clear change |
| People below the poverty line | 15.9% ±5.0 pts | 17.2% | −15.5 pts |
| Children under 18 below the poverty line | 10.7% ±9.0 pts | 17.6% | – |
| Households receiving SNAP | 34.0% ±6.8 pts | 28.6% | – |
| Households with a computer | 91.4% ±2.9 pts | 93.4% | – |
| Households with a broadband subscription | 90.8% ±4.4 pts | 91.8% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Alamosa?
Owners occupy 44.3% of Alamosa's occupied homes and renters 55.7%. The median owner-occupied home is valued at $225,200 by its owner (±$36,648). The median renter pays $837 a month including utilities, and 27.2% of renters pay 35% or more of their income on rent.
| Measure | Alamosa | Alamosa County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $225,200 ±$36,648 | $239,100 | no clear change |
| Median gross rent | $837 ±$121 | $907 | no clear change |
| Renters paying 35% or more of income on rent | 27.2% ±9.9 pts | 29.0% | −14.2 pts |
| Median monthly owner costs, with a mortgage | $1,337 ±$141 | $1,317 | – |
| Owner-occupied homes | 44.3% ±7.1 pts | 55.9% | no clear change |
| Renter-occupied homes | 55.7% ±7.1 pts | 44.1% | – |
| Housing units | 4,464 ±177 | 7,241 | no clear change |
| Homeowner vacancy rate | 0.0% ±2.3 pts | 0.1% | – |
| Rental vacancy rate | 4.2% ±4.3 pts | 3.7% | – |
| Single-family detached homes | 57.1% ±6.6 pts | 61.2% | – |
| Mobile homes | 2.4% ±1.5 pts | 12.2% | – |
| Built 2020 or later | 0.2% ±0.4 pts | 0.9% | – |
| Built 2010 to 2019 | 13.8% ±5.1 pts | 10.5% | – |
| Built 1939 or earlier | 11.2% ±3.4 pts | 12.0% | – |
| Households with no vehicle | 10.6% ±3.0 pts | 7.9% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Alamosa building?
Builders took permits for 28 new housing units in Alamosa in 2025 (14 in single-family houses), 2.8 per 1,000 residents against 5.6 across Colorado.
Counts of units in permits a local office issued; not every permitted unit is built. A year marked with months was reported for part of the year.
Source: Building Permits Survey, annual place files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Alamosa work and get to work?
75.9% of Alamosa's workers drive alone and 4.3% work from home. The average trip to work takes 14.1 minutes. The unemployment rate in 2020-2024 averaged 4.4%.
| Measure | Alamosa | Alamosa County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 61.7% ±4.5 pts | 63.4% | – |
| Unemployment rate | 4.4% ±2.3 pts | 3.7% | −8.0 pts |
| Drove alone to work | 75.9% ±5.4 pts | 74.7% | – |
| Carpooled | 7.2% ±3.6 pts | 12.6% | – |
| Public transportation | 0.1% ±0.3 pts | 0.1% | – |
| Walked | 9.5% ±3.3 pts | 5.9% | – |
| Worked from home | 4.3% ±2.0 pts | 5.0% | – |
| Mean travel time to work | 14.1 min ±3.4 | 15.9 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Alamosa?
3 census tracts lie mostly in Alamosa, and 1 more reaches into it (2020 census blocks). Their median household incomes run from $50,028 (Tract 9603) to $65,568 (Tract 9602.01).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 9603Alamosa County | 5,590 | $50,028 |
| Tract 9602.02Alamosa County | 4,027 | $54,559 |
| Tract 9602.01Alamosa County | 2,334 | $65,568 |
| Tract 9601Alamosa County | 2,628 | $61,397 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Alamosa) · Census block assignment files
How does Alamosa compare with other places in Colorado?
By the Census Bureau's July 2025 estimates, Alamosa is the 3,253rd-most populous of the 19,476 U.S. incorporated places that have one and the 55th-most populous of 272 in Colorado.
Alamosa ranks 205th of 218 places in Colorado with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 55th | 272 |
| Growth 2020-2025 (PEP) | 86th | 150 |
| Residents per square mile | 119th | 221 |
| Median household income | 205th | 218 |
| Per capita income | 202nd | 220 |
| Median home value | 196th | 217 |
| Median gross rent | 186th | 200 |
| Poverty rate | 37th | 151 |
| Bachelor's degree or higher | 128th | 216 |
| Median age | 201st | 220 |
| Owner-occupied share | 209th | 218 |
| Work from home | 173rd | 176 |
| Travel time to work | 203rd | 221 |
Alamosa's figures with every place in Colorado (CSV)
Every place in Colorado, sortable · Compare Alamosa with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Alamosa?
7 of the 57 figures for Alamosa on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Alamosa are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' public schools in Alamosa.