There are 3 US Post Offices in Franklin County serving a total of 11,014 residents equating to 3,671 residents per post office. It's estimated that approximately 17,580 packages are handled across the 3 county post offices annually. Franklin County is a county along the Gulf of Mexico in the Florida panhandle of the U.S. state of Florida. As of the 2010 census, the population was 11,549, making it the third-least populous county in Florida. The county seat is Apalachicola. The county includes several large preserved areas and rivers and has been home to commercial timber and fishing industry. More recently it has become popular for tourism and retirement. It includes several rivers, state parks, and islands."