Delaware, constituent state of the United States of America. The first of the original 13 states to ratify the federal Constitution, it occupies a small niche in the Boston – Washington, D.C., urban corridor along the Middle Atlantic seaboard. It ranks 49th among the 50 U.S. states in terms of total area and is one of the most densely populated.

The State of Delaware is located in the Mid-Atlantic region of the United States. Delaware is bordered by the state of Maryland in the west and south; by Pennsylvania in the north, and by New Jersey in the east. It is also bordered by the Atlantic Ocean, Delaware Bay, and Delaware River in the southeast.