Reagan County is a county on the Edwards Plateau in the U.S. state of Texas. As of the 2010 census, its population was 3,367. The county seat is Big Lake. The county is named after John Henninger Reagan (1818-1905), who was the postmaster general of the Confederate States and also a U.S. Senator, U.S. Representative, and first chairman of the Railroad Commission of Texas.
According to the U.S. Census Bureau, the county has a total area of 1,176 square miles (3,050 km), of which 1,175 square miles (3,040 km) are land and 0.7 square miles (1.8 km) (0.06%) is covered by water. The Spraberry Trend, the third-largest oil field in the United States by remaining reserves, underlies much of the county.
As of the census of 2000, there were 3,326 people, 1,107 households, and 872 families residing in the county. The population density was 3 inhabitants per square mile (1.2/km). There were 1,452 housing units at an average density of 1 per square mile (0.39/km). The racial makeup of the county was 64.64% White, 3.01% Black or African American, 0.54% Native American, 0.27% Asian, 29.56% from other races, and 1.98% from two or more races. 49.49% of the population were Hispanic or Latino of any race.
There were 1,107 households out of which 46.80% had children under the age of 18 living with them, 68.10% were married couples living together, 7.20% had a female householder with no husband present, and 21.20% were non-families. 19.80% of all households were made up of individuals and 7.50% had someone living alone who was 65 years of age or older. The average household size was 2.96 and the average family size was 3.42.
In the county, the population was spread out with 34.20% under the age of 18, 7.60% from 18 to 24, 28.10% from 25 to 44, 19.90% from 45 to 64, and 10.30% who were 65 years of age or older. The median age was 32 years. For every 100 females there were 100.50 males. For every 100 females age 18 and over, there were 100.50 males.
The median income for a household in the county was $33,231, and the median income for a family was $36,806. Males had a median income of $31,228 versus $18,750 for females. The per capita income for the county was $13,174. About 9.30% of families and 11.80% of the population were below the poverty line, including 10.60% of those under age 18 and 23.60% of those age 65 or over.