Magnolia is a city located in the U.S. state of Arkansas. It is within and the county seat of Columbia County. It has a total area of 13.21 square miles at 33°16′27″N 93°14′1″W. The elevation is 338 feet above sea level. As of the 2010 census data, it had a total population of 11,577. The population density was 880.13/sq mi. Estimated per capita income in 2015 was $34,678. It is using Zip code 71753.