Hayden (also Hardenburgh or Six Mile) is an unincorporated census-designated place in central Spencer Township, Jennings County, Indiana, United States. It lies along CR700W, west of the town of Vernon, the county seat of Jennings County. Its elevation is 620 feet (189 m), and it is located at 38°58′59″N 85°44′26″W (38.9831094, -85.7405275). Although Hayden is unincorporated, it has a post office, with the ZIP code of 47245.Hayden was platted in 1854.