Arkadelphia is a city in Clark County, Arkansas, United States. According to 2005 Census Bureau estimates, the population of the city was 10,548. The city is the county seat of Clark County. The city is situated at the foothills of the Ouachita Mountains. Two universities, Henderson State University and Ouachita Baptist University, are located there.
Arkadelphia is located at 34°7′19″N 93°3′58″W / 34.12194°N 93.06611°W / 34.12194; -93.06611 (34.121920, -93.066178). According to the United States Census Bureau, the city has a total area of 7.4 square miles (19.2 km2), of which 7.3 square miles (18.9 km2) is land and 0.04 square miles (0.1 km2) is water. The total area is 0.41% water.
As of the census of 2000, there were 10,912 people, 3,865 households, and 2,187 families residing in the city. The population density was 1,486.2 people per square mile (574.0/km²). There were 4,216 housing units at an average density of 574.2 per square mile (221.8/km²). The racial makeup of the city was 68.98% White, 26.51% Black or African American, 0.53% Native American, 1.29% Asian, 0.05% Pacific Islander, 1.35% from other races, and 1.28% from two or more races. 2.59% of the population were Hispanic or Latino of any race.