There are 6 US Post Offices in Marion County serving a total of 28,335 residents equating to 4,723 residents per post office. It's estimated that approximately 45,226 packages are handled across the 6 county post offices annually. Marion County is a county of the U.S. state of Alabama. As of the 2010 census the population was 30,776. The county seat is Hamilton. The county was created by an act of the Alabama Territorial General Assembly on February 13, 1818. The county seat was originally established in Pikeville in 1820, and moved to Hamilton in 1881. The county was named for General Francis Marion of South Carolina. Marion County is located in the northwestern part of the state, bounded on the west by the state of Mississippi. It encompasses 743 square miles (1,920 km2). The county is a prohibition or dry county, however, the sale of alcohol is permitted within the cities of Guin, Hamilton, and Winfield."