Maryland
Delaware.
Pennsylvania
Pennsylvania shares the longest border.
Oklahoma
New York
Pennsylvania borders Maryland to the south.
Indiana begins at the western border of Ohio. Ohio is the western border is Pennsylvania
Indiana begins at the western border of Ohio. Ohio is the western border is Pennsylvania
Indiana begins at the western border of Ohio. Ohio is the western border is Pennsylvania
The entire western boundary of Kansas is included in the border of Colorado.
North Dakota and Idaho share a land border with Canada. Pennsylvania shares a maritime border with Canada across Lake Erie.
Vermont shares its northern border with New York.