There are 2 US Post Offices in Marion County serving a total of 7,785 residents equating to 3,893 residents per post office. It's estimated that approximately 12,426 packages are handled across the 2 county post offices annually. Marion County is a county located in the U.S. state of Georgia. As of the 2010 Census reflected a population of 8,742. The county seat is Buena Vista. The county was created on December 14, 1827. The county was named for General Francis Marion of South Carolina. Marion County is included in the Columbus, GA-AL Metropolitan Statistical Area. The art site of Pasaquan is located in Marion County."