Las Animas County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 14,555.^[1] The county seat is Trinidad.^[2] The county takes its name from the Mexican Spanish name of the Purgatoire River, originally called El Río de las Ánimas Perdidas en el Purgatorio, which means "River of the Lost Souls in Purgatory."^[3]

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Las Animas County
County
Las Animas County Courthouse in Trinidad
Location within the U.S. state of Colorado
Colorado's location within the U.S.
Coordinates: 37.32°N 104.04°W / 37.32; -104.04
Country	United States
State	Colorado
Founded	February 9, 1866
Named for	Purgatoire River
Seat	Trinidad
Area
• Total	4,775 sq mi (12,370 km2)
• Land	4,773 sq mi (12,360 km2)
• Water	2.7 sq mi (7 km2)  0.06%
Population  (2020)
• Total	14,555
• Density	3/sq mi (1/km2)
Time zone	UTC−7 (Mountain)
• Summer (DST)	UTC−6 (MDT)
Area code	719
Website	lasanimascounty.colorado.gov

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According to the U.S. Census Bureau, the county has a total area of 4,775 square miles (12,370 km²), of which 4,773 square miles (12,360 km²) is land and 2.7 square miles (7.0 km²) (0.06%) is water.^[4] It is the largest county by area in Colorado.

At the 2000 census there were 15,207 people, 6,173 households, and 4,092 families living in the county. The population density was 3 people per square mile (1.2 people/km²). There were 7,629 housing units at an average density of 2 units per square mile (0.77 units/km²). The racial makeup of the county was 82.63% White, 0.39% Black or African American, 2.54% Native American, 0.37% Asian, 0.20% Pacific Islander, 10.03% from other races, and 3.83% from two or more races. 41.45% of the population were Hispanic or Latino of any race.^[10] Of the 6,173 households 28.80% had children under the age of 18 living with them, 49.90% were married couples living together, 11.60% had a female householder with no husband present, and 33.70% were non-families. 29.70% of households were one person and 14.30% were one person aged 65 or older. The average household size was 2.40 and the average family size was 2.97.

The age distribution was 24.20% under the age of 18, 7.90% from 18 to 24, 24.00% from 25 to 44, 25.90% from 45 to 64, and 18.00% 65 or older. The median age was 41 years. For every 100 females there were 95.80 males. For every 100 females age 18 and over, there were 93.70 males.

The median household income was $28,273 and the median family income was $34,072. Males had a median income of $27,182 versus $20,891 for females. The per capita income for the county was $16,829. About 14.00% of families and 17.30% of the population were below the poverty line, including 20.00% of those under age 18 and 17.20% of those age 65 or over.

A Democratic stronghold since the days of Franklin Roosevelt after having been solidly Republican during the "system of 1896" like the rest of Hispanic Colorado, Las Animas County has seen a strong trend toward the Republican Party in recent elections. Hillary Clinton's 2016 performance was the worst by a Democrat since John W. Davis in 1924. She was also the first Democrat to lose the county since George McGovern in 1972. In 2020, Joe Biden became the first Democrat to win the presidency without the county since Woodrow Wilson in 1912.

• Area affected by 1930s Dust Bowl
• Public library in Trinidad serves Las Animas County
• Santa Nina de Atoche church, Tijeras Plaza, Las Animas County, c.1934
• Philatelic cover postmarked Officer, Colorado on the last day of service. Mail from this discontinued post office was then handled at Villegreen, Colorado, now also a discontinued post office.

• Bibliography of Colorado
• Geography of Colorado
• History of Colorado
  • National Register of Historic Places listings in Las Animas County, Colorado
• Index of Colorado-related articles
• List of Colorado-related lists
  • List of counties in Colorado
• Outline of Colorado