St. Croix is an unincorporated community in northern Oil Township, Perry County, Indiana, United States. It lies along State Road 62 near its intersection with Interstate 64 and State Road 37, northeast of the city of Tell City, the county seat of Perry County. Its elevation is 725 feet (221 m), and it is located at (38°13′26″N86°35′11″W) (38.2239489, -86.5863736). Although St.