There are 7 US Post Offices in Rabun County serving a total of 15,909 residents equating to 2,273 residents per post office. It's estimated that approximately 25,393 packages are handled across the 7 county post offices annually. Rabun County is the northeasternmost county in the U.S. state of Georgia. As of the 2010 census, the population was 16,276. The county seat is Clayton. With an average annual rainfall of over 70 inches (1,800 mm), Rabun County has the title of the rainiest county in Georgia and one of the rainiest counties east of the Mississippi River."