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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 (34.121920, -93.066178). According to the United States Census Bureau, the city has a total area of 7.4 square miles (19.1 km²), of which, 7.3 square miles (19.0 km²) of it is land and 0.04 square miles (0.1 km²) of it is water. The total area is 0.41% water.