Alamosa County, Colorado Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 31st-largest in Colorado
The population of Alamosa County, Colorado is 16,515 as of the 2023 American Community Survey, making it the 31st-largest county in Colorado. The median household income is $51,445, the median home value is $218,800, and the median age is 33.1.
The population of Alamosa County has grown 7.6% since 2010 (15,515 → 16,689), a +0.52% annualized rate.
16,515
Population
+0.52%
Annual growth
23
People / sq mi
$51,445
Median Income
$218,800
Median Home Value
Alamosa County covers 723 sq mi of land at 22.9 people per square mile.
About Alamosa County, CO
Alamosa County is a county in Colorado with a population of 16,515. It ranks #31 among counties in Colorado by population. The median age is 33.1, younger than the national median. The population is 49.4% male and 50.6% female.
The median household income in Alamosa County is $51,445, below the US median of $74,580. 13.4% of residents live below the federal poverty level. Home values sit at a median of $218,800, with monthly rent averaging $904. The homeownership rate of 56.4% is lower than the national rate of 64.8%.
Educational attainment in Alamosa County reflects 29.3% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 3.9% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 15.5 minutes each way.
Alamosa County Population History (2010-2024)
The county of Alamosa County had a population of 15,515 in 2010 and 16,689 in 2024, a 7.6% growth over 14 years. The peak was 16,689 in 2024. Average annual growth rate: 0.52%.
16,689
Population (2024)
15,515
Population (2010)
16,689
Peak (2024)
0.52%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 15,515 |
| 2011 | 15,715 |
| 2012 | 15,685 |
| 2013 | 15,794 |
| 2014 | 15,807 |
| 2015 | 15,894 |
| 2016 | 16,047 |
| 2017 | 16,102 |
| 2018 | 16,235 |
| 2019 | 16,200 |
| 2020 | 16,375 |
| 2021 | 16,578 |
| 2022 | 16,593 |
| 2023 | 16,668 |
| 2024 | 16,689 |
Race & Ethnicity
| White | 61.6% |
| Black or African American | 1.8% |
| Asian | 0.5% |
| Hispanic or Latino (any race) | 9.3% |
| Two or More Races | 0.2% |
Age & Sex
33.1
Median Age
50.6%
Female
49.4%
Male
14.8%
Age 65+
Age Distribution
Children (under 15): 19.7% · Seniors (65+): 14.8%
Income & Poverty
| Median household income | $51,445$-41,025 vs state |
| Mean household income | $73,926 |
| Per-capita income | $29,622 |
| Poverty rate | 13.4%+7.5% vs state |
| Unemployment rate | 1.6% |
| Employment-to-population | 60.7% |
Top Industries by Employment
The largest employment sector in Alamosa County is professional & business services, accounting for 33.7% of workers.
How residents commute
0.1%
Drive alone
4.9%
Carpool
76.5%
Public transit
3.9%
Work from home
15.5 min
Avg commute
Housing
$218,800$-283,400 vs state
Median home value
$904
Median rent
56.4%
Homeownership rate
7,148
Total housing units
91.9%
Occupied
8.1%
Vacant
43.6%
Renter-occupied
Social & access
93.6%
With health insurance
92.9%
With broadband internet
30.1%
Foreign-born
4.1%
Veterans (18+)
18.5%
With a disability
79.1%
Speak language other than English at home
Education
89.1%
High School+
29.3%
Bachelor's+
Largest cities in Colorado
Other counties in Colorado
Part of Colorado
Metro areas in Colorado
County rankings
Frequently Asked Questions
Alamosa County, Colorado has a population of 16,515 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 31st-largest county in Colorado. Population density is 23 people per square mile.
The population of Alamosa County has grown 7.6% since 2010 (15,515 → 16,689), a +0.52% annualized rate.
The median household income in Alamosa County, Colorado is $51,445, with mean (average) household income of $73,926 and per-capita income of $29,622. 13.4% of residents live below the federal poverty level.
In Alamosa County, the largest racial and ethnic groups are White (61.6%), Hispanic or Latino (9.3%), Black or African American (1.8%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Alamosa County, Colorado is 33.1 years. Residents are 50.6% female and 49.4% male.
The median home value in Alamosa County is $218,800 and median monthly rent is $904. 56.4% of occupied housing units are owner-occupied. The county has 7,148 total housing units, 8.1% of which are vacant.
The largest employment sector in Alamosa County, Colorado is professional, scientific, and management services, employing 33.7% of workers. The unemployment rate is 1.6%.
Denver is among the largest cities associated with Alamosa County, Colorado, with a population of 713,734.
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Statewide data for Colorado
Population, race, income, age, and trends across Colorado
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.