Allegheny City (1788–1907) was a Pennsylvania municipality located on the north side of the junction of the Allegheny and Ohio rivers, across from downtown Pittsburgh. It was annexed by Pittsburgh in 1907. The area today is known as the North Side of Pittsburgh, and its waterfront district, along the Allegheny and Ohio Rivers, as the North Shore.

Prior to the 1850s, this area was largely farmland, but was subdivided into residential lots, first for the growing German population and later for the Croats. It was commonly referred to as "Deutschtown".

A massive urban redevelopment project in the 1960s demolished the core of historic Allegheny City, leaving only the Commons of Allegheny Center and its surrounding neighborhoods to evoke the area's past. The Carnegie Library, the Old Post Office Building, and the Buhl Planetarium buildings were not demolished. Major portions of the neighborhoods of Allegheny West, Manchester, Central Northside, California-Kirkbride (Old Allegheny Rows), and East Allegheny are listed on the National Register of Historic Places, including the Mexican War Streets in Central Northside.

Pennsylvania (ⁱ/ˌpɛnsɨlˈveɪnjə/), officially the Commonwealth of Pennsylvania, is a US state that is located in the Northeastern and Mid-Atlantic regions of the United States, and the Great Lakes Region. The state borders Delaware to the southeast, Maryland to the south, West Virginia to the southwest, Ohio to the west, Ontario, Canada to the northwest, New York 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.

Pennsylvania is 170 miles (274 km) north to south and 283 miles (455 km) east to west. Of a total 46,055 square miles (119,282 km²), 44,817 square miles (116,075 km²) are land, 490 square miles (1,269 km²) are inland waters, and 749 square miles (1,940 km²) are waters in Lake Erie. It is the 33rd largest state in the United States. Pennsylvania has 51 miles (82 km) of coastline along Lake Erie and 57 miles (92 km) of shoreline along the Delaware Estuary.