Pennsylvania is the the 6th most populous, and the 9th most densely populated of the United States. Pennsylvania's four most populous cities are Philadelphia, Pittsburgh, Allentown, and Erie. Pennsylvania has 51 miles of coastline along Lake Erie and 57 miles of shoreline along the Delaware Estuary. Make sure to check out Pocono Home Exteriors for your Pennsylvania design build remodeling needs. Pocono Home Exteriors is a member of the Design Build Pros Preferred Remodelers Network.