Pennsylvania County Creation Dates and Parent CountiesEdit This Page

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United States Gotoarrow.png Pennsylvania Gotoarrow.png County Creation Dates

County YearCreated Parent County Year Split and Child County
Adams 22 Jan 1800 York none
Allegheny 24 Sep 1788 Washington, Westmoreland Armstrong, Beaver, Venango, Warren, Butler, Crawford, Erie, and Mercer 1800
Armstrong 12 Mar 1800 Allegheny, Westmoreland, Lycoming. Attached to Westmoreland County until 1805. Clarion 1839
Beaver 12 Mar 1800 Allegheny, Washington. Attached to Allegheny Co. until 1803 Lawrence 1849
Bedford 9 Mar 1771 Cumberland Northumberland 1772, Westmoreland 1773, Huntingdon 1787, Somerset 1795, Cambria 1804, Blair 1846, Fulton 1850
Berks 14 Oct 1751 (org. 1752) Philadelphia, Chester, Lancaster Northumberland 1772, Schuylkill 1811
Blair 26 Feb 1846 Huntingdon, Bedford none
Bradford 21 Feb 1810 (org. 1812) renamed fromm Ontario 1812 none
Bucks 10 Mar 1682 none Northampton1751
Butler 12 Mar 1800 Allegheny none
Cambria 26 Mar 1804 (org. 1807) Huntingdon, Somerset, and Bedford none
Cameron 29 Mar 1860 Clinton, McKean, Elk, Potter none
Carbon 13 Mar 1843 Northampton, Monroe none
Centre 13 Feb 1800 Huntingdon, Lycoming, Mifflin, Northumberland Clinton 1839
Chester 10 Mar 1682 Colonial Lands Lancaster 1728, Berks 1751, Delaware in 1789
Clarion 10 Mar 1682 Venango, Armstrong none
Clearfield 26 Mar 1804 (org. 1812) Huntingdon and Lycoming (Clearfield did not have its own courts until 1822.) Elk 1843
Clinton 21 Jan 1839 Centre and Lycoming Cameron 1860
Columbia 22 Mar 1813 Northumberland Additional land went to Schuylkill 1818, Montour 1850
Crawford 12 Mar 1800 Allegheny No counties were formed from Crawford Co. Venango, Erie, Warren, and Mercer counties were attached to Crawford Co. for several years.
Cumberland 27 Jan 1750 Lancaster Bedford 1771, Northumberland 1772, Franklin 1784, Mifflin 1789, Perry 1820
Dauphin 4 Mar 1785 Lancaster Lebanon 1813
Delaware 26 Sep 1789 Chester none
Elk 18 Apr 1843 Jefferson, Clearfield, McKean Cameron 1860
Erie 12 Mar 1800 Allegheny (Attached to Crawford Co. for several years.) none
Fayette 26 Sep 1783 Westmoreland none
Forest 11 Apr 1848 Jefferson none
Franklin 9 Sep 1784 Cumberland none
Fulton 19 Apr 1850 Bedford none
Greene 9 Feb 1796 Washington none
Huntingdon 20 Sep 1787 Bedford Centre 1800, Cambria and Clearfield 1804, Blair 1846
Indiana 30 Mar 1803 Westmoreland, Lycoming (attached to Westmoreland Co. until 1806 when county was organized.) none
Jefferson 26 Mar 1804 Lycoming (Attached to Westmoreland Co. until 1806, then to Indiana Co. until 1830.) Elk 1843, Forest 1848
Juniata 2 Mar 1831 Mifflin none
Lackawanna 21 Aug 1878 Luzerne none
Lancaster 14 Oct 1728 Chester (Earlier was part of Susquehannock Indian territory.) York 1748, Cumberland 1750, Berks 1751, Northumberland 1772, Dauphin 1785, Lebanon 1813
Lawrence 20 Mar 1849 Beaver, Mercer none
Lebanon 16 Feb 1813 Dauphin, Lancaster none
Lehigh 6 Mar 1812 Northampton none
Luzerne 25 Sep 1786 Northumberland Ontario, Susquehanna 1810, Schuylkill 1818, Wyoming 1842, Lackawanna 1878
Lycoming 13 Apr 1795 Northumberland Armstrong, Venango, Warren 1800, Indiana 1803, Clearfield, Jefferson, McKean, Potter, Tioga 1804, Ontario 1810, Clinton 1839, Sullivan 1847
McKean 26 Mar 1804 Lycoming (Attached to Centre Co. 1804-1814, then to Lycoming Co. and Potter Co. until organized in 1826.) Elk 1843, Cameron 1860
Mercer 12 Mar 1800 Allegheny (Attached to Crawford Co.; organized in 1804.) Lawrence 1849
Mifflin 19 Sep 1789 Cumberland, Northumberland Centre 1800, Juniata 1831
Monroe 1 Apr 1836 Northampton, Pike Carbon 1843.
Montgomery 10 Sep 1784 Philadelphia none
Montour 3 May 1850 Columbia none
Northampton 14 Oct 1751 (org. 1752) Bucks Northumberland 1772, Wayne 1798, Schuylkill 1811, Lehigh 1812, Monroe 1836, Carbon 1843
Northumberland 21 Mar 1772 Lancaster, Cumberland, Berks, Bedford, Northampton Luzerne 1786, Mifflin 1789, Lycoming 1795, Centre 1800, Columbia and Union 1813.
Ontario 21 Feb 1810 Luzerne renamed Bradford 1812
Perry 22 Mar 1820 Cumberland none
Philadelphia 10 Mar 1682 Colonial Lands Berks 1751, Montgomery 1784. In 1854 all townships, districts and other parts of county consolidated into the City of Philadelphia.
Pike 26 Mar 1814 Wayne Monroe 1836
Potter 26 Mar 1804 Lycoming (Attached to Lycoming Co. but elected joint commissioners with McKean Co. in 1814; became separate county in 1824; organized in 1835.) Cameron 1860
Schuylkill 1 Mar 1811 Berks, Northampton. In March 1818 additional land was received from parts of Columbia and Luzerne counties. none
Snyder 2 Mar 1855 Union none
Somerset 17 Apr 1795 Bedford Cambria 1804
Sullivan 15 Mar 1847 Lycoming none
Susquehanna 21 Feb 1810 (org. 1812) Luzerne none
Tioga 26 Mar 1804 Lycoming (Tioga Co. was part of land claimed by Connecticut. none
Union 22 Mar 1813 Northumberland Snyder 1855
Venango 12 Mar 1800 Allegheny, Lycoming (Attached to Crawford Co.; organized in 1805.) Clarion 1839, Forest 1866
Warren 12 Mar 1800 Allegheny, Lycoming (organized in 1819. Attached to Crawford Co. until 1805, the to Venango Co. until 1819.) none
Washington 28 Mar 1781 Westmoreland Parts to Allegheny 1788, Greene 1796, Beaver 1800
Wayne 21 Mar 1798 Northampton Pike 1814
Westmoreland 26 Feb 1773 Bedford Washington 1781, Fayette 1783, Allegheny 1788, Armstrong 1800, Indiana 1803
Wyoming 4 Apr 1842 Luzerne none
York 14 Oct 1749 Lancaster Adams 1800

Extinct or Renamed Counties: | Ontario

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  • This page was last modified on 16 November 2010, at 06:31.
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