Alamosa County is a county located in the U.S. state of Colorado. As of the 2010 census, the population was 15,445. The county seat is Alamosa. The county name is the Spanish language word for a "grove of cottonwood trees."


Alamosa County was created by the Colorado legislature on March 8, 1913, out of northwestern Costilla County.


thumb|Alamosa County, Colorado According to the U.S. Census Bureau, the county has a total area of , of which is land and (0.1%) is water.

Adjacent counties

*Saguache County, Colorado - north *Huerfano County, Colorado - east *Costilla County, Colorado - southeast *Conejos County, Colorado - southwest *Rio Grande County, Colorado - west

Major Highways

* U.S. Highway 160 * U.S. Highway 285 * State Highway 17 * State Highway 150 * State Highway 368 * State Highway 370 * State Highway 371

National protected area

*Great Sand Dunes National Park and Preserve

Other protected areas

*Alamosa National Wildlife Refuge *Great Sand Dunes Wilderness *Monte Vista National Wildlife Refuge *Rio Grande National Forest *San Luis State Park *Sangre de Cristo Wilderness

Scenic trails

*Los Caminos Antiguos Scenic and Historic Byway *Old Spanish National Historic Trail


Alamosa is served by San Luis Valley Regional Airport. The only commercial service is to Denver.


At the 2000 census there were 14,966 people, 5,467 households, and 3,651 families living in the county. The population density was 21 people per square mile (8/km2). There were 6,088 housing units at an average density of 8 per square mile (3/km2). The racial makeup of the county was 71.19% White, 0.97% Black or African American, 2.34% Native American, 0.82% Asian, 0.19% Pacific Islander, 20.34% from other races, and 4.16% from two or more races. 41.41% of the population were Hispanic or Latino of any race. Of the 5,467 households 35.30% had children under the age of 18 living with them, 50.50% were married couples living together, 11.70% had a female householder with no husband present, and 33.20% were non-families. 27.30% of households were one person and 8.70% were one person aged 65 or older. The average household size was 2.56 and the average family size was 3.14. The age distribution was 27.20% under the age of 18, 15.90% from 18 to 24, 26.70% from 25 to 44, 20.60% from 45 to 64, and 9.60% 65 or older. The median age was 31 years. For every 100 females there were 99.00 males. For every 100 females age 18 and over, there were 95.30 males. The median household income was $29,447 and the median family income was $38,389. Males had a median income of $27,733 versus $22,806 for females. The per capita income for the county was $15,037. About 15.60% of families and 21.30% of the population were below the poverty line, including 27.40% of those under age 18 and 13.90% of those age 65 or over. In 2000, the largest denominational groups were Catholics (with 5,716 members) and Evangelical Protestants (with 1,755 members). The largest religious bodies were the Catholic Church (with 5,716 adherents) and The Church of Jesus Christ of Latter-day Saints (with 1,155 adherents).


Alamosa County is a competitive swing county, voting for the winning Presidential candidate in every election since its formation except 1944, 1960, 1976, 2016, and 2020. In the 2016 election, Donald Trump – who captured several previously solidly Democratic counties in southern Colorado – became the first Republican to win the presidency without carrying the county since it was created before the 1916 election. Trump flipped the county in 2020, the only one in Colorado, and one of only fifteen nationally, which he turned from blue to red that year.






Unincorporated communities

*Alamosa East (a census-designated place) *Mosca *Waverly

License plate code

Alamosa County has used the following county codes on Colorado license plates issued to passenger vehicles in the county: XE-XG and EAA-ABD.http://www.15q.net/coco.html

See also

*Outline of Colorado *Index of Colorado-related articles *Colorado census statistical areas *Colorado counties *National Register of Historic Places listings in Alamosa County, Colorado



External links

Alamosa County Government websiteColorado Historical Society
{{authority control Category:1913 establishments in Colorado Category:Populated places established in 1913 Category:Colorado counties Category:San Luis Valley of Colorado