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
Homeownership is the standout figure in Alamosa County: 56.4% of homes are owner-occupied, lower than the national rate. With 16,515 residents, Alamosa County is a county in Colorado. It ranks #31 among counties in Colorado by population.
Incomes run on the lower side: a median household income of $51,445, below the US median of $78,538. The poverty rate is 13.4%, above the national 12.4%. Median home value is $218,800, with typical rent around $904.
College attainment is above the local norm at 29.3%, below the national 35.0%. Just 3.9% of workers are home-based, below the national 14.0%, and the average commute runs about 16 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.
Alamosa County, CO Climate
Alamosa County, CO has an average annual temperature of 5.9°C (43°F) and receives about 222 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
5.9°C
Avg Temp
222
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -8° / 17° | 7 mm |
| February | -4° / 25° | 5 mm |
| March | 2° / 35° | 11 mm |
| April | 6° / 42° | 11 mm |
| May | 11° / 52° | 20 mm |
| June | 16° / 61° | 18 mm |
| July | 19° / 66° | 37 mm |
| August | 18° / 64° | 45 mm |
| September | 14° / 56° | 28 mm |
| October | 7° / 45° | 19 mm |
| November | -1° / 31° | 13 mm |
| December | -7° / 19° | 8 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Alamosa County, CO
The most comfortable months to visit Alamosa County, CO are typically July, August and June, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 29°C high). The coldest is January (near -19°C low). August is usually the wettest month.
Where to stay near Alamosa County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.