Dauphin Island is a town in Mobile County, Alabama (U.S. ), on a barrier island also named Dauphin Island (split by the Katrina Cut), at the Gulf of Mexico. The population was 1,371 at the 2000 census. The town is included in the Mobile metropolitan statistical area. The island (originally named "Massacre Island") was renamed for Louis XIV's great-grandson and heir, the Dauphin. The Gulf of Mexico is to the south of the island; the Mississippi Sound and Mobile Bay are to the north.