Sulphur Rock is a town located in the U.S. state of Arkansas. It is within Independence County with a total area of 1.27 square miles at 35°45′7″N 91°30′7″W. The elevation is 325 feet above sea level. As of the 2010 census data, it had a total population of 456. The population density was 358.71/sq mi. Estimated per capita income in 2016 was $17,809. It has Zip code 72579.