Pennsylvania, officially the Commonwealth of Pennsylvania, is a state in the Northeastern, Great Lakes, Appalachian, and Mid-Atlantic regions of the United States. The Commonwealth is bordered by Delaware to the southeast, Maryland to the south, West Virginia to the southwest, Ohio to the west, Lake Erie and the Canadian province of Ontario to the northwest, New York to the north, and New Jersey to the east, while the Appalachian Mountains run through its middle. Pennsylvania is the 33rd-largest state by area, and the 5th-most populous state according to the most recent official U.S. Census count in 2010.

Rhode Island, officially the State of Rhode Island is a state in the New England region of the United States. It is the smallest U.S. state by area and the seventh least populous (1,059,361 as of 2019), but it is also the second most densely populated behind New Jersey. The state has land borders with Connecticut to the west, Massachusetts to the north and east, and the Atlantic Ocean to the south via Rhode Island Sound and Block Island Sound. It also shares a small maritime border with New York.