ARKADELPHIA, a city of Arkansas, U.S.A., on the Ouachita river, about 65m. S.W. of Little Rock; the county seat of Clark county. It is on federal highway 67, and is served by the Missouri Pacific railroad. The population in 1920 was 3,31I, in Federal census. Arkadelphia is picturesquely located among roll ing hills. It has one of the largest flour mills in the State, cotton gins, tile plants, sawmills, and a cotton-seed oil-mill. Abundant power is available from the hydro-electric development of the Ouachita. Arkadelphia is the seat of Ouachita college (Baptist; established 1888) and of Henderson-Brown college (Methodist; established 1890), both co-educational institutions. The first settler was John Hemphill, who came in 1811 from South Caro lina. He set up a salt works, the first in the State. The manu facture of salt was continued until the Civil War, and was the cause of fighting for the possession of the city.