Arkadelphia, AR has a population of 10,728 and is the 3,746th largest city in the United States. The population density is 1,512 per sq mi which is 2627% higher than the Arkansas average and 1569% higher than the national average. The median age in Arkadelphia is 23 which is approximately 39% lower than the Arkansas average of 38. In Arkadelphia, 37% of the population over 15 years of age are married, 93% speak English and 5% speak Spanish. 64% of Arkadelphia residents were born in Arkansas, 31% were born out of state, 1% were born outside of the United States and 4% were foreign born.