St. Johns County is a county of the U.S. state of Florida. The county seat and largest incorporated city is St. Augustine.
St. Johns County was established in 1821, one of the first counties created when Florida was ceded to the United States. Today the county is part of the Jacksonville metropolitan area. The county is primarily made up of residential bedroom communities. Tourism, primarily associated with St. Augustine and the many golf courses in the area, is the chief economic industry.
