Johnson is a town located in the U.S. state of Arkansas. It is within Washington County on the Springfield Plateau deep in the Ozark Mountains which is bordered by valleys and natural springs. It has a total land area of 3.1 square miles at 36°8′2″N 94°9′57″W. The elevation is 1,198 feet above sea level. As of the 2010 census data, it had a total population of 3,353. The population density was 1,007.20/sq mi. Estimated per capita income in 2015 was $35,843. It is using Zip code 72741.