Prowers County is one of the 64 counties in the U.S. state of Colorado. As of the 2010 census, the population was 12,551. The county seat is Lamar. The county is named in honor of John W. Prowers, a leading pioneer in the lower Arkansas valley region.
According to the U.S. Census Bureau, the county has a total area of 1,644 square miles (4,260 km), of which 1,638 square miles (4,240 km) is land and 5.9 square miles (15 km) (0.4%) is water.
As of the census of 2010, there were 12,551 people, 4,935 households, and 3,351 families residing in the county. The population density was 7.6 people per square mile (2.9/km²). There were 5,942 housing units at an average density of 3.6 per square mile (1.4/km²). The racial makeup of the county was 81.0% White, 0.5% Black or African American, 0.9% Native American, 0.3% Asian, 0.0% Pacific Islander, 14.7% from other races, and 2.6% from two or more races. 35.2% of the population were Hispanic or Latino of any race.
There were 4,935 households of which 49.5% were married couples living together, 12.6% had a female householder with no husband present, and 32.1% were non-families. 28.3% of all households were made up of individuals and 11.5% had someone living alone who was 65 years of age or older. The average household size was 2.48 and the average family size was 3.04.
In the county, the population was spread out with 27.1% under the age of 18, 9.3% from 18 to 24, 22.7% from 25 to 44, 26.3% from 45 to 64, and 14.6% who were 65 years of age or older. The median age was 36.7 years. For every 100 females there were 97.7 males. For every 100 females age 18 and over, there were 93.1 males.
The median income for a household in the county was $33,969, and the median income for a family was $47,052. Males working full-time and year-round had a median income of $32,359 versus $28,727 for females. The per capita income for the county was $18,429. About 18.7% of families and 22.1% of the population were below the poverty line, including 30.8% of those under age 18 and 13.1% of those age 65 or over.