Pennsylvania Counties
County Date Parent County County Seat
Formed
Adams 1800 York Gettysburg
Allegheny 1786 Washington, Pittsburgh
Westmoreland
Armstrong 1800 Allegheny, Lycoming, Kittanning
Westmoreland
Beaver 1800 Allegheny, Washington Beaver
Bedford 1771 Cumberland Bedford
Berks 1752 Chester, Lancaster, Reading
Philadelphia
Blair 1846 Bedford, Huntingdon Hollidaysburg
Bradford 1810 Luzerne, Lycoming Towanda
Bucks 1682 original county Doylestown
Butler 1800 Allegheny Butler
Cambria 1804 Bedford, Huntingdon, Ebensburg
Somerset
Cameron 1860 Clinton, Elk, McKean, Emporium
Potter
Carbon 1843 Monroe, Northampton Jim Thorpe
Huntingdon, Lycoming,
Centre 1800 Mifflin, Bellefonte
Northumberland
Chester 1682 original county West Chester
Clarion 1839 Armstrong, Venango Clarion
Clearfield 1804 Huntingdon, Lycoming Clearfield
Clinton 1839 Centre, Lycoming Lock Haven
Columbia 1813 Northumberland Bloomsburg
Crawford 1800 Allegheny Meadville
Cumberland 1750 Lancaster Carlisle
Dauphin 1785 Lancaster Harrisburg
Delaware 1789 Chester Media
Elk 1843 Clearfield, Ridgway
Jefferson, McKean
Erie 1800 Allegheny, Crawford Erie
Fayette 1783 Westmoreland Uniontown
Forest 1848 Jefferson, Venango Tionesta
Franklin 1784 Cumberland Chambersburg
Fulton 1850 Bedford McConnellsburg
Greene 1796 Washington Waynesburg
Huntingdon 1787 Bedford Huntingdon
Indiana 1803 Lycoming, Indiana
Westmoreland
Jefferson 1804 Lycoming Brookville
Juniata 1831 Mifflin Mifflintown
Lackawanna 1870 Luzerne Scranton
Lancaster 1729 Chester Lancaster
Lawrence 1849 Beaver, Mercer New Castle
Lebanon 1813 Dauphin, Lancaster Lebanon
Lehigh 1812 Northampton Allentown
Luzerne 1786 Northumberland Wilkes-Barre
Lycoming 1795 Northumberland Williamsport
McKean 1804 Lycoming Smethport
Mercer 1800 Allegheny, Crawford Mercer
Mifflin 1789 Cumberland, Lewistown
Northumberland
Monroe 1836 Northampton, Pike Stroudsburg
Montgomery 1784 Philadelphia Norristown
Montour 1850 Columbia Danville
Northampton 1752 Bucks Easton
Bedford, Berks,
Northumberland1772 Cumberland, Sunbury
Lancaster,
Northampton
Perry 1820 Cumberland New Bloomfield
Philadelphia 1682 original county Philadelphia
Pike 1814 Wayne Milford
Potter 1804 Lycoming Coudersport
Schuylkill 1811 Berks, Northampton Pottsville
Snyder 1855 Union Middleburg
Somerset 1795 Bedford Somerset
Sullivan 1847 Lycoming Laporte
Susquehanna 1810 Luzerne Montrose
Tioga 1804 Lycoming Wellsboro
Union 1813 Northumberland Lewisburg
Venango 1800 Allegheny, Crawford, Franklin
Lycoming
Warren 1800 Allegheny, Crawford, Warren
Lycoming, Venango
Washington 1781 Westmoreland Washington
Wayne 1798 Northampton Honesdale
Westmoreland 1773 Bedford Greensburg
Wyoming 1842 Luzerne Tunkhannock
York 1749 Lancaster York
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