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Pennsylvania, officially the Commonwealth of Pennsylvania, is a U.S. state that is located in the Northeastern and Mid-Atlantic regions of the United States, and the Great Lakes Region. The state borders Delaware and Maryland to the south, West Virginia to the southwest, Ohio to the west, New York and Ontario, Canada, to the north, and New Jersey to the east. Pennsylvania is the 33rd most extensive, the 6th most populous, and the 9th most densely populated of the 50 United States. The state's four most populous cities are Philadelphia, Pittsburgh, Allentown and Erie. The state capital is Harrisburg. Pennsylvania has 51 miles (82 km) of shoreline along Lake Erie and 57 miles (92 km) of shoreline along the Delaware Estuary.
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