Alamosa County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 16,376.^[1] The county seat is Alamosa.^[2] The county name is the Spanish language word for a grove of cottonwood trees.

Quick Facts Country, State ...

Alamosa County
County
Alamosa County Courthouse
Location within the U.S. state of Colorado
Colorado's location within the U.S.
Coordinates: 37°34′N 105°47′W
Country	United States
State	Colorado
Founded	March 8, 1913
Named for	Spanish language word for a grove of cottonwood trees
Seat	Alamosa
Largest city	Alamosa
Area
• Total	723 sq mi (1,870 km2)
• Land	723 sq mi (1,870 km2)
• Water	0.7 sq mi (2 km2)  0.1%
Population  (2020)
• Total	16,376[1]
• Density	23/sq mi (9/km2)
Time zone	UTC−7 (Mountain)
• Summer (DST)	UTC−6 (MDT)
Congressional district	3rd
Website	alamosacounty.colorado.gov

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

According to the U.S. Census Bureau, the county has a total area of 723 square miles (1,870 km²), of which 723 square miles (1,870 km²) is land and 0.7 square miles (1.8 km²) (0.1%) is water.^[3]

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 (8.1 people/km²). There were 6,088 housing units at an average density of 8 per square mile (3.1/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.^[9] 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).^[10] 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).^[10]

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.

The Alamosa County Sheriff's Office is a county law enforcement agency in Alamosa County, Colorado, United States.^[12] It consists of 18 sworn law enforcement officers and 21 civilian support personnel.^[13]

Rank structure

More information Title, Insignia ...

Title	Insignia
Sheriff
Undersheriff
Sergeant
Corporal
Deputy

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Alamosa County has used the following county codes on Colorado license plates issued to passenger vehicles in the county: XE-XG and EAA-ABD.^[14]

• Bibliography of Colorado
• Geography of Colorado
  • San Luis Valley
• History of Colorado
  • National Register of Historic Places listings in Alamosa County, Colorado
• Index of Colorado-related articles
• List of Colorado-related lists
  • List of counties in Colorado
• Outline of Colorado