Marmaduke, AR has a population of 1,293 and is the 13,581st largest city in the United States. The population density is 998 per sq mi which is 1699% higher than the Arkansas average and 1001% higher than the national average. The median age in Marmaduke is 35 which is approximately 6% lower than the Arkansas average of 38. In Marmaduke, 51% of the population over 15 years of age are married, 97% speak English and 3% speak Spanish. 61% of Marmaduke residents were born in Arkansas, 38% were born out of state, 0% were born outside of the United States and 0% were foreign born.