There are 2 US Post Offices in Charlton County serving a total of 12,274 residents equating to 6,137 residents per post office. It's estimated that approximately 19,591 packages are handled across the 2 county post offices annually. Charlton County is the southernmost county of the U.S. state of Georgia. As of the 2010 census, the population was 12,171. The county seat is Folkston.