Little River County, Arkansas  Little River County is a county located on the southwest border of the U.S. state of Arkansas, bordering a corner with Texas and Oklahoma. As of the 2010 census, the population was 13,171. The county seat is Ashdown. Little River County is included in the Texarkana, TX-AR Metropolitan Statistical Area. Little River County is Arkansas's 59th county, formed from Sevier County on March 5, 1867, during the Reconstruction era and named for the Little River. The county is separated from all other surrounding counties in the state by water (a characteristic shared only with neighboring Miller County). The Little River, Millwood Lake and the Red River form the boundaries of the county within the state. According to the U.S. Census Bureau, the county has a total area of , of which is land and (5.8%) is water. It is the third-smallest county in Arkansas by land area and fourth-smallest by total area. As of the 2000 census, there were 13,628 people, 5,465 households, and 3,912 families residing in the county. The population density was 26 people per square mile (10/km2). There were 6,435 housing units at an average density of 12 per square mile (5/km2). The racial makeup of the county was 74.52% White, 21.27% Black or African American, 1.45% Native American, 0.20% Asian, 0.03% Pacific Islander, 0.86% from other races, and 1.67% from two or more races. 1.72% of the population were Hispanic or Latino of any race. There were 5,465 households, out of which 31.40% had children under the age of 18 living with them, 55.60% were married couples living together, 12.30% had a female householder with no husband present, and 28.40% were non-families. 26.30% of all households were made up of individuals, and 12.00% had someone living alone who was 65 years of age or older. The average household size was 2.46 and the average family size was 2.95. In the county, the population was spread out, with 25.20% under the age of 18, 8.40% from 18 to 24, 25.70% from 25 to 44, 25.60% from 45 to 64, and 15.10% who were 65 years of age or older.