middle atlantic states State of Delaware A state located on the Atlantic Coast in the Mid-Atlantic region of the United States. Delaware is located in the eastern section of the Delmarva Peninsula, between Delaware Bay and Chesapeake Bay. Delaware is bounded to the north by Pennsylvania; to the east by the Delaware River, Delaware Bay, New Jersey and the Atlantic Ocean; and to the west and south by Maryland. LanguaL curation note: US FDA 1995 Code: US10 delaware State of Delaware A state located on the Atlantic Coast in the Mid-Atlantic region of the United States. Delaware is located in the eastern section of the Delmarva Peninsula, between Delaware Bay and Chesapeake Bay. Delaware is bounded to the north by Pennsylvania; to the east by the Delaware River, Delaware Bay, New Jersey and the Atlantic Ocean; and to the west and south by Maryland. LanguaL curation note: US FDA 1995 Code: US10 delaware