There are 2 US Post Offices in Gulf County serving a total of 16,198 residents equating to 8,099 residents per post office. It's estimated that approximately 25,854 packages are handled across the 2 county post offices annually. Gulf County is a county located in the panhandle of the U.S. state of Florida. As of the 2010 census, the population was 15,863. Its county seat is Port St. Joe. Gulf County is included in the Panama City, FL Metropolitan Statistical Area."