what county in florida is port saint joe in?
Port St. Joe, Florida. Port St. Joe is a city located at the intersection of U.S. Highway 98 and State Road 71 in Gulf County, Florida, United States. As of the 2010 census the population was 3,445. This was a decline from 3,644 as of the 2000 census. Port St. Joe became the county seat of Gulf County in 1965.