Rockland is an unincorporated community in northern New Castle County, Delaware, United States. It lies along Rockland Road north of the city of Wilmington, the county seat of New Castle County. Its elevation is 194 feet (59 m). Although it is unincorporated, it has a post office, with the ZIP code of 19732. The Rockland Historic District and William Young House are listed on the National Register of Historic Places.