Mammoth Spring, AR has a population of 1,111 and is the 14,507th largest city in the United States. The population density is 861 per sq mi which is 1452% higher than the Arkansas average and 850% higher than the national average. The median age in Mammoth Spring is 45 which is approximately 19% higher than the Arkansas average of 38. In Mammoth Spring, 56% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 38% of Mammoth Spring residents were born in Arkansas, 60% were born out of state, 0% were born outside of the United States and 2% were foreign born.