Vintage Destination T-shirt representing the northeastern region of the Delmarva Peninsula, including its islands and territory in the Delaware River. It may be the second smallest and sixth least populous state, but it boasts the sixth highest population density. Within Delaware, Wilmington is the most populous city and Dover is the second most populous. Additionally, the state is divided into three counties, the fewest among all 50 U.S. states. These counties, from north to south, are New Castle County, Kent County, and Sussex County.