Marion is a city located in the U.S. state of Arkansas. It is within and the county seat of Crittenden County. Marion is included in the Memphis metropolitan area. It has a total area of 20.52 square miles at 35°12′22″N 90°12′6″W. The elevation is 226 feet above sea level. As of the 2010 census data, it had a total population of 12,345. The population density was 604.59/sq mi. Estimated per capita income in 2015 was $26,784. It is using Zip code 72364.