Greenwich is a township in Cumberland County in the Vineland-Millville metro area. It borders Fairfield Township, Hopewell Township, Stow Creek Township, Salem County, and the Delaware Bay. The township has a total area of 18.9 square miles and a population around 850. Historic Greenwich Township offers a unique rural community with a rich heritage. Nearly all of the homes built during the 18th century along the tree shaded Ye Greate Street remain intact, and the entire town is on the National Register of Historic Places.