Mammoth Spring is a city located in the U.S. state of Arkansas. It is within Fulton County. It has a total area of 1.39 square miles at 36°29′36″N 91°32′37″W. The elevation is 528 feet above sea level. As of the 2010 census data, it had a total population of 977. The population density was 716.10/sq mi. It is using Zip code 72554.