Pennsylvania County Creation Dates and Parent CountiesEdit This Page

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Name of County Date Formed Boundary
Changes
Parent County Counties Created by Boundary Changes
Adams 1800 Jan 22 Details York none
Allegheny 1788 Sep 24 Details Washington, Westmoreland Armstrong, Beaver, Venango, Warren, Butler, Crawford, Erie, and Mercer 1800
Armstrong 1800 Mar 12 Details Allegheny, Westmoreland, Lycoming. Attached to Westmoreland County until 1805. Clarion 1839
Beaver 1800 Mar 12 Details Allegheny, Washington. Attached to Allegheny Co. until 1803
Bedford 1771 Mar 09 Details Cumberland Northumberland 1772, Westmoreland 1773, Huntingdon 1787, Somerset 1795, Cambria 1804, Blair 1846, Fulton 1850
Berks 1752 Oct 14 Details Philadelphia, Chester, Lancaster Northumberland 1772, Schuylkill 1811
Blair 1846 Feb 26 Details Huntingdon, Bedford none
Bradford 1812 Feb 21 Details renamed fromm Ontario 1812 none
Bucks 1682 Mar 10 Details none Northampton1751
Butler 1800 Mar 12 Details Allegheny none
Cambria 1807 Mar 26 Details Huntingdon, Somerset, and Bedford none
Cameron 1860 Mar 29 Details Clinton, McKean, Elk, Potter none
Carbon 1843 Mar 13 Details Northampton, Monroe none
Centre 1800 Feb 13 Details Huntingdon, Lycoming, Mifflin, Northumberland Clinton 1839
Chester 1682 Mar 10 Details Colonial Lands Lancaster 1728, Berks 1751, Delaware in 1789
Clarion 1682 Mar 10 Details Venango, Armstrong none
Clearfield 1804 Mar 26 Details Huntingdon and Lycoming (Clearfield did not have its own courts until 1822.) Elk 1843
Clinton 1839 Jan 21 Details Centre and Lycoming Cameron 1860
Columbia 1813 Mar 22 Details Northumberland Additional land went to Schuylkill 1818, Montour 1850
Crawford 1800 Mar 12 Details Allegheny No counties were formed from Crawford Co. Venango, Erie, Warren, and Mercer counties were attached to Crawford Co. for several years.
Cumberland 1750 Jan 27 Details Lancaster Bedford 1771, Northumberland 1772, Franklin 1784, Mifflin 1789, Perry 1820
Dauphin 1785 Mar 04 Details Lancaster Lebanon 1813
Delaware 1789 Sep 26 Details Chester none
Elk 1843 Apr 18 Details Jefferson, Clearfield, McKean Cameron 1860
Erie 1800 Mar 12 Details Allegheny (Attached to Crawford Co. for several years.) none
Fayette 1783 Sep 26 Details Westmoreland none
Forest 1848 Apr 11 Details Jefferson none
Franklin 1784 Sep 09 Details Cumberland none
Fulton 1850 Apr 19 Details Bedford none
Greene 1796 Feb 09 Details Washington none
Huntingdon 1787 Sep 20 Details Bedford Centre 1800, Cambria and Clearfield 1804, Blair 1846
Indiana 1803 Mar 30 Details Westmoreland, Lycoming (attached to Westmoreland Co. until 1806 when county was organized.) none
Jefferson 1804 Mar 26 Details Lycoming (Attached to Westmoreland Co. until 1806, then to Indiana Co. until 1830.) Elk 1843, Forest 1848
Juniata 1831 Mar 02 Details Mifflin none
Lackawanna 1878 Aug 21 Details Luzerne none
Lancaster 1728 Oct 14 Details Chester (Earlier was part of Susquehannock Indian territory.) York 1748, Cumberland 1750, Berks 1751, Northumberland 1772, Dauphin 1785, Lebanon 1813
Lawrence 1849 Mar 20 Details Beaver, Mercer none
Lebanon 1813 Feb 16 Details Dauphin, Lancaster none
Lehigh 1812 Mar 06 Details Northampton none
Luzerne 1786 Sep 25 Details Northumberland Ontario, Susquehanna 1810, Schuylkill 1818, Wyoming 1842, Lackawanna 1878
Lycoming 1795 Apr 13 Details Northumberland Armstrong, Venango, Warren 1800, Indiana 1803, Clearfield, Jefferson, McKean, Potter, Tioga 1804, Ontario 1810, Clinton 1839, Sullivan 1847
McKean 1804 Mar 26 Details Lycoming (Attached to Centre Co. 1804-1814, then to Lycoming Co. and Potter Co. until organized in 1826.) Elk 1843, Cameron 1860
Mercer 1800 Mar 12 Details Allegheny (Attached to Crawford Co.; organized in 1804.) Lawrence 1849
Mifflin 1789 Sep 19 Details Cumberland, Northumberland Centre 1800, Juniata 1831
Monroe 1836 Apr 01 Details Northampton, Pike Carbon 1843.
Montgomery 1784 Sep 10 Details Philadelphia none
Montour 1850 May 03 Details Columbia none
Northampton 1752 Oct 14 Details Bucks Northumberland 1772, Wayne 1798, Schuylkill 1811, Lehigh 1812, Monroe 1836, Carbon 1843
Northumberland 1772 Mar 21 Details Lancaster, Cumberland, Berks, Bedford, Northampton Luzerne 1786, Mifflin 1789, Lycoming 1795, Centre 1800, Columbia and Union 1813.
Ontario 1810 Feb 21 Details Luzerne renamed Bradford 1812
Perry 1820 Mar 22 Details Cumberland none
Philadelphia 1682 Mar 10 Details Colonial Lands Berks 1751, Montgomery 1784. In 1854 all townships, districts and other parts of county consolidated into the City of Philadelphia.
Pike 1814 Mar 26 Details Wayne Monroe 1836
Potter 1804 Mar 26 Details 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 1811 Mar 01 Details Berks, Northampton. In March 1818 additional land was received from parts of Columbia and Luzerne counties. none
Snyder 1855 Mar 02 Details Union none
Somerset 1795 Apr 17 Details Bedford Cambria 1804
Sullivan 1847 Mar 15 Details Lycoming none
Susquehanna 1812 Feb 21 Details Luzerne none
Tioga 1804 Mar 26 Details Lycoming (Tioga Co. was part of land claimed by Connecticut. none
Union 1813 Mar 22 Details Northumberland Snyder 1855
Venango 1800 Mar 12 Details Allegheny, Lycoming (Attached to Crawford Co.; organized in 1805.) Clarion 1839, Forest 1866
Warren 1800 Mar 12 Details Allegheny, Lycoming (organized in 1819. Attached to Crawford Co. until 1805, the to Venango Co. until 1819.) none
Washington 1781 Mar 28 Details Westmoreland Parts to Allegheny 1788, Greene 1796, Beaver 1800
Wayne 1798 Mar 21 Details Northampton Pike 1814
Westmoreland 1773 Feb 26 Details Bedford Washington 1781, Fayette 1783, Allegheny 1788, Armstrong 1800, Indiana 1803
Wyoming 1842 Apr 04 Details Luzerne none
York 1749 Oct 14 Details Lancaster Adams 1800

Extinct or Renamed Counties: | Ontario


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  • This page was last modified on 13 August 2014, at 16:24.
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