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Gulf County, Florida Gulf County is a county located in the panhandle of the U.S. state of Florida. The U.S. Census Bureau 2016 estimate for the county is 16,628. Its county seat is Port St. Joe. History Gulf County was created in 1925. It was named for the Gulf of Mexico. Its county seat, Port Saint Joe, then called Saint Joseph, was the site of Florida's first Constitutional Convention in 1838.  |