Magnolia is a city in Columbia County, Arkansas, United States. According to 2006 Census Bureau estimates, the population of the city is 10,951 according to the U.S. Census Bureau reports of 2009. The city is the county seat of Columbia County. Magnolia is home to the World's Largest Charcoal Grill and the World Championship Steak Cookoff, part of the Magnolia Blossom Festival.