How many people live in Alamosa County, CO?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 16,700 people living in Alamosa County, CO. That makes Alamosa County the 30th-most populous county in Colorado. It is home to 0.28% of people living in the state.
16.7K
population of Alamosa County, CO (2024)
0.28%
County share of the Colorado population (2024)
About 16,700 people lived in Alamosa County, CO in 2024.
Population estimates, 2000–2024
What are Alamosa County, CO’s age demographics?
About 2,600 Alamosa County residents are aged 65 and older in 2024. That represents 15.7% of its population. For comparison, the age group represents 16.5% of Colorado’s population and 18% in the US overall.
Another 4,000 Alamosa County residents, or 23.9% of the population, were children under 18. For comparison, the age group represents 20.5% of Colorado’s population and 21.6% in the US overall.
A higher share of Alamosa County, CO's population is aged 18–24 than the US as a whole.
Population estimates by age group, (2024)
What are Alamosa County, CO’s racial and ethnic demographics?
Hispanic residents make up 49% of the Alamosa County, CO population, higher than the national share of 20%. Alamosa County, CO also has a larger share of people identifying as non-Hispanic American Indian and Alaska Native (1.4%) than the US overall (0.72%).
In contrast, Alamosa County’s non-Hispanic white population accounts for 45.2%, below the 57.5% nationwide, and the non-Hispanic Black or African American population makes up 1.4% of the county, compared with 12.6% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Alamosa County, CO has a higher share of a Hispanic population than Colorado as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Alamosa County, CO is Alamosa with about 9,900 residents in 2024.
Cities and towns in Alamosa County, CO ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Alamosa | 9,906 |
| 2. | Hooper | 77 |
| 3. | Balance of Alamosa County | 6,706 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
