Counties formed since 1800

Bradford - formed 1810 from part of Luzerne and Lycoming (Prior to 1821 this county was called Ontario)

Cambria - formed 1804 from part of Huntingdon, Somerset, and Bedford

Clearfield - formed 1804 from part of Lycoming and Northumberland

Columbia - formed 1813 from part of Northumberland

Indiana - formed 1803 from part of Westmoreland and Lycoming

Jefferson - formed 1804 from part of Lycoming

Lebanon - formed 1813 from part of Dauphin and Lancaster

Lehigh - formed 1812 from part of Northampton

McKean - formed 1804 from part of Lycoming

Perry - formed 1820 from part of Cumberland

Pike - formed 1814 from part of Wayne

Potter - formed 1804 from part of Lycoming

Schuylkill - formed 1811 from part of Berks and Northampton

Susquehanna - formed 1810 from part of Luzerne

Tioga - formed 1804 from part of Lycoming

Union - formed 1813 from part of Northumberland