Pennsylvania County Creation Dates and Parent Counties

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{| width="100%" cellspacing="1" cellpadding="1" border="1"
 
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{| cellspacing="1" cellpadding="1" width="100%" border="1"
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| '''County'''<br>
+
| '''County'''<br>  
| '''Year<br>Created'''<br>
+
| '''Year<br>Created'''<br>  
| '''Parent County'''<br>
+
| '''Parent County'''<br>  
 
| '''Year Split and Child County'''<br>
 
| '''Year Split and Child County'''<br>
 
|-
 
|-
 
| valign="top" | [[Adams County, Pennsylvania|Adams]]  
 
| valign="top" | [[Adams County, Pennsylvania|Adams]]  
| valign="top" | 1800<br>
+
| valign="top" | 1800<br>  
 
| valign="top" | York  
 
| valign="top" | York  
 
| valign="top" | &nbsp;--<br>
 
| valign="top" | &nbsp;--<br>
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| In 1800 parts of Armstrong, Beaver, Venango, and Warren counties and all of Butler, Crawford, Erie, and Mercer counties came from Allegheny Co.
 
| In 1800 parts of Armstrong, Beaver, Venango, and Warren counties and all of Butler, Crawford, Erie, and Mercer counties came from Allegheny Co.
 
|-
 
|-
| style="vertical-align: top" | [[Armstrong County, Pennsylvania|Armstrong]]  
+
| style="vertical-align: top;" | [[Armstrong County, Pennsylvania|Armstrong]]  
| style="vertical-align: top" | 1800<br>
+
| style="vertical-align: top;" | 1800<br>  
| style="vertical-align: top" | <font face="Arial Unicode MS,Arial,sans-serif" size="2"><font face="Arial Unicode MS,Arial,sans-serif" size="2">Allegheny, Westmoreland, Lycoming.&nbsp;Attached to Westmoreland County until 1805.</font></font>&nbsp;  
+
| style="vertical-align: top;" | <font face="Arial Unicode MS,Arial,sans-serif" size="2"><font face="Arial Unicode MS,Arial,sans-serif" size="2">Allegheny, Westmoreland, Lycoming.&nbsp;Attached to Westmoreland County until 1805.</font></font>&nbsp;  
| style="vertical-align: top" | Part of Clarion County was formed in 1839 from Armstrong Co.<br>
+
| style="vertical-align: top;" | Part of Clarion County was formed in 1839 from Armstrong Co.<br>
 
|-
 
|-
| style="vertical-align: top" | [[Beaver County, Pennsylvania|Beaver]]  
+
| style="vertical-align: top;" | [[Beaver County, Pennsylvania|Beaver]]  
| style="vertical-align: top" | 1800<br>
+
| style="vertical-align: top;" | 1800<br>  
| style="vertical-align: top" | <font face="Arial Unicode MS,Arial,sans-serif" size="2"><font face="Arial Unicode MS,Arial,sans-serif" size="2">Allegheny, Washington. Attached to Allegheny Co. until 1803.</font></font>  
+
| style="vertical-align: top;" | <font face="Arial Unicode MS,Arial,sans-serif" size="2"><font face="Arial Unicode MS,Arial,sans-serif" size="2">Allegheny, Washington. Attached to Allegheny Co. until 1803.</font></font>  
| style="vertical-align: top" | <font face="Arial Unicode MS,Arial,sans-serif" size="2"><font face="Arial Unicode MS,Arial,sans-serif" size="2">Part of Lawrence County was formed in 1849 from Beaver Co.</font></font>
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| style="vertical-align: top;" | <font face="Arial Unicode MS,Arial,sans-serif" size="2"><font face="Arial Unicode MS,Arial,sans-serif" size="2">Part of Lawrence County was formed in 1849 from Beaver Co.</font></font>
 
|-
 
|-
| style="vertical-align: top" | [[Bedford County, Pennsylvania|Bedford]]  
+
| style="vertical-align: top;" | [[Bedford County, Pennsylvania|Bedford]]  
| style="vertical-align: top" | <font face="Arial Unicode MS,Arial,sans-serif" size="2"><font face="Arial Unicode MS,Arial,sans-serif" size="2">1771</font></font>  
+
| style="vertical-align: top;" | <font face="Arial Unicode MS,Arial,sans-serif" size="2"><font face="Arial Unicode MS,Arial,sans-serif" size="2">1771</font></font>  
| style="vertical-align: top" | <font face="Arial Unicode MS,Arial,sans-serif" size="2"><font face="Arial Unicode MS,Arial,sans-serif" size="2">Cumberland</font></font>  
+
| style="vertical-align: top;" | <font face="Arial Unicode MS,Arial,sans-serif" size="2"><font face="Arial Unicode MS,Arial,sans-serif" size="2">Cumberland</font></font>  
| style="vertical-align: top" | <font face="Arial Unicode MS,Arial,sans-serif" size="2"><font face="Arial Unicode MS,Arial,sans-serif" size="2">From it came part of Northumberland Co. in 1772, Westmoreland Co. in 1773, Huntingdon Co. in 1787, Somerset Co. in 1795, part of Cambria Co. in 1804, part of Blair Co. in 1846, Fulton Co. in 1850.</font></font>
+
| style="vertical-align: top;" | <font face="Arial Unicode MS,Arial,sans-serif" size="2"><font face="Arial Unicode MS,Arial,sans-serif" size="2">From it came part of Northumberland Co. in 1772, Westmoreland Co. in 1773, Huntingdon Co. in 1787, Somerset Co. in 1795, part of Cambria Co. in 1804, part of Blair Co. in 1846, Fulton Co. in 1850.</font></font>
 
|-
 
|-
| style="vertical-align: top" | [[Berks County, Pennsylvania|Berks]]  
+
| style="vertical-align: top;" | [[Berks County, Pennsylvania|Berks]]  
| style="vertical-align: top" | 1751 (org. 1752)  
+
| style="vertical-align: top;" | 1751 (org. 1752)  
| style="vertical-align: top" | Philadelphia, Chester, Lancaster<br>
+
| style="vertical-align: top;" | Philadelphia, Chester, Lancaster<br>  
| style="vertical-align: top" | From it came part of Northumberland Co. in 1772 and part of Schuylkill Co. in 1811.
+
| style="vertical-align: top;" | From it came part of Northumberland Co. in 1772 and part of Schuylkill Co. in 1811.
 
|-
 
|-
| style="vertical-align: top" | [[Blair County, Pennsylvania|Blair]]  
+
| style="vertical-align: top;" | [[Blair County, Pennsylvania|Blair]]  
| style="vertical-align: top" | 1846  
+
| style="vertical-align: top;" | 1846  
| style="vertical-align: top" | Huntingdon,&nbsp;Bedford  
+
| style="vertical-align: top;" | Huntingdon,&nbsp;Bedford  
| style="vertical-align: top" | &nbsp;--
+
| style="vertical-align: top;" | &nbsp;--
 
|-
 
|-
| style="vertical-align: top" | [[Bradford County, Pennsylvania|Bradford]]&nbsp;(first named Ontario County)  
+
| style="vertical-align: top;" | [[Bradford County, Pennsylvania|Bradford]]&nbsp;(first named Ontario County)  
| style="vertical-align: top" | 1810 (org. 1812)  
+
| style="vertical-align: top;" | 1810 (org. 1812)  
| style="vertical-align: top" | Luzerne and Lycoming  
+
| style="vertical-align: top;" | Luzerne and Lycoming  
| style="vertical-align: top" | &nbsp;--
+
| style="vertical-align: top;" | &nbsp;--
 
|-
 
|-
| style="vertical-align: top" | [[Bucks County, Pennsylvania|Bucks]]  
+
| style="vertical-align: top;" | [[Bucks County, Pennsylvania|Bucks]]  
| style="vertical-align: top" | 1682  
+
| style="vertical-align: top;" | 1682  
| style="vertical-align: top" | &nbsp;--  
+
| style="vertical-align: top;" | &nbsp;--  
| style="vertical-align: top" | In 1751 Northampton County was set off.
+
| style="vertical-align: top;" | In 1751 Northampton County was set off.
 
|-
 
|-
| style="vertical-align: top" | [[Butler County, Pennsylvania|Butler]]  
+
| style="vertical-align: top;" | [[Butler County, Pennsylvania|Butler]]  
| style="vertical-align: top" | 1800  
+
| style="vertical-align: top;" | 1800  
| style="vertical-align: top" | Allegheny  
+
| style="vertical-align: top;" | Allegheny  
| style="vertical-align: top" | &nbsp;--
+
| style="vertical-align: top;" | &nbsp;--
 
|-
 
|-
| style="vertical-align: top" | [[Cambria County, Pennsylvania|Cambria]]  
+
| style="vertical-align: top;" | [[Cambria County, Pennsylvania|Cambria]]  
| style="vertical-align: top" | 1804 (org. 1807)  
+
| style="vertical-align: top;" | 1804 (org. 1807)  
| style="vertical-align: top" | Huntingdon, Somerset, and Bedford  
+
| style="vertical-align: top;" | Huntingdon, Somerset, and Bedford  
| style="vertical-align: top" | &nbsp;--
+
| style="vertical-align: top;" | &nbsp;--
 
|-
 
|-
| style="vertical-align: top" | [[Cameron County, Pennsylvania|Cameron]]  
+
| style="vertical-align: top;" | [[Cameron County, Pennsylvania|Cameron]]  
| style="vertical-align: top" | 1860<br>
+
| style="vertical-align: top;" | 1860<br>  
| style="vertical-align: top" | Clinton, McKean, Elk, Potter<br>
+
| style="vertical-align: top;" | Clinton, McKean, Elk, Potter<br>  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>
 
|-
 
|-
| style="vertical-align: top" | [[Carbon County, Pennsylvania|Carbon]]  
+
| style="vertical-align: top;" | [[Carbon County, Pennsylvania|Carbon]]  
| style="vertical-align: top" | 1843<br>
+
| style="vertical-align: top;" | 1843<br>  
| style="vertical-align: top" | Northampton,&nbsp;Monroe  
+
| style="vertical-align: top;" | Northampton,&nbsp;Monroe  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>
 
|-
 
|-
| style="vertical-align: top" | [[Centre County, Pennsylvania|Centre]]  
+
| style="vertical-align: top;" | [[Centre County, Pennsylvania|Centre]]  
| style="vertical-align: top" | 1800<br>
+
| style="vertical-align: top;" | 1800<br>  
| style="vertical-align: top" | Huntingdon, Lycoming, Mifflin, Northumberland  
+
| style="vertical-align: top;" | Huntingdon, Lycoming, Mifflin, Northumberland  
| style="vertical-align: top" | Part of Clinton County was formed in 1839 from Centre Co.
+
| style="vertical-align: top;" | Part of Clinton County was formed in 1839 from Centre Co.
 
|-
 
|-
| style="vertical-align: top" | [[Chester County, Pennsylvania|Chester]]  
+
| style="vertical-align: top;" | [[Chester County, Pennsylvania|Chester]]  
| style="vertical-align: top" | 1682  
+
| style="vertical-align: top;" | 1682  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>  
| style="vertical-align: top" | From it came Lancaster in 1728, part of Berks in 1751, Delaware in 1789.
+
| style="vertical-align: top;" | From it came Lancaster in 1728, part of Berks in 1751, Delaware in 1789.
 
|-
 
|-
| style="vertical-align: top" | [[Clarion County, Pennsylvania|Clarion]]  
+
| style="vertical-align: top;" | [[Clarion County, Pennsylvania|Clarion]]  
| style="vertical-align: top" | 1682<br>
+
| style="vertical-align: top;" | 1682<br>  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>  
| style="vertical-align: top" | From it came these counties: Lancaster in 1728, part of Berks in 1751, Delaware in 1789.
+
| style="vertical-align: top;" | From it came these counties: Lancaster in 1728, part of Berks in 1751, Delaware in 1789.
 
|-
 
|-
| style="vertical-align: top" | [[Clearfield County, Pennsylvania|Clearfield]]  
+
| style="vertical-align: top;" | [[Clearfield County, Pennsylvania|Clearfield]]  
| style="vertical-align: top" | 1804 (org. 1812)  
+
| style="vertical-align: top;" | 1804 (org. 1812)  
| style="vertical-align: top" | Huntingdon and Lycoming (Clearfield did not have its own courts until 1822.)  
+
| style="vertical-align: top;" | Huntingdon and Lycoming (Clearfield did not have its own courts until 1822.)  
| style="vertical-align: top" | Part of Elk Co. was formed in 1843 from Clearfield Co.<br>
+
| style="vertical-align: top;" | Part of Elk Co. was formed in 1843 from Clearfield Co.<br>
 
|-
 
|-
| style="vertical-align: top" | [[Clinton County, Pennsylvania|Clinton]]  
+
| style="vertical-align: top;" | [[Clinton County, Pennsylvania|Clinton]]  
| style="vertical-align: top" | 1839<br>
+
| style="vertical-align: top;" | 1839<br>  
| style="vertical-align: top" | Centre and Lycoming<br>
+
| style="vertical-align: top;" | Centre and Lycoming<br>  
| style="vertical-align: top" | In 1860 part of Cameron County was formed from Clinton Co.
+
| style="vertical-align: top;" | In 1860 part of Cameron County was formed from Clinton Co.
 
|-
 
|-
| style="vertical-align: top" | [[Columbia County, Pennsylvania|Columbia]]  
+
| style="vertical-align: top;" | [[Columbia County, Pennsylvania|Columbia]]  
| style="vertical-align: top" | 1813<br>
+
| style="vertical-align: top;" | 1813<br>  
| style="vertical-align: top" | Northumberland<br>
+
| style="vertical-align: top;" | Northumberland<br>  
| style="vertical-align: top" | In 1818 additional land went to Schuylkill Co. In 1850 Montour Co. was formed from Columbia Co.
+
| style="vertical-align: top;" | In 1818 additional land went to Schuylkill Co. In 1850 Montour Co. was formed from Columbia Co.
 
|-
 
|-
| style="vertical-align: top" | [[Crawford County, Pennsylvania|Crawford]]  
+
| style="vertical-align: top;" | [[Crawford County, Pennsylvania|Crawford]]  
| style="vertical-align: top" | 1800<br>
+
| style="vertical-align: top;" | 1800<br>  
| style="vertical-align: top" | Allegheny<br>
+
| style="vertical-align: top;" | Allegheny<br>  
| style="vertical-align: top" | No counties were formed from Crawford Co. Venango, Erie, Warren, and Mercer counties were attached to Crawford Co. for several years.
+
| style="vertical-align: top;" | No counties were formed from Crawford Co. Venango, Erie, Warren, and Mercer counties were attached to Crawford Co. for several years.
 
|-
 
|-
| style="vertical-align: top" | [[Cumberland County, Pennsylvania|Cumberland]]  
+
| style="vertical-align: top;" | [[Cumberland County, Pennsylvania|Cumberland]]  
| style="vertical-align: top" | 1750<br>
+
| style="vertical-align: top;" | 1750<br>  
| style="vertical-align: top" | Lancaster<br>
+
| style="vertical-align: top;" | Lancaster<br>  
| style="vertical-align: top" | From it came Bedford Co., in 1771, part of Northumberland Co. in 1772, Franklin Co. in 1784, part of Mifflin Co. in 1789, Perry Co. in 1820.
+
| style="vertical-align: top;" | From it came Bedford Co., in 1771, part of Northumberland Co. in 1772, Franklin Co. in 1784, part of Mifflin Co. in 1789, Perry Co. in 1820.
 
|-
 
|-
| style="vertical-align: top" | [[Dauphin County, Pennsylvania|Dauphin]]  
+
| style="vertical-align: top;" | [[Dauphin County, Pennsylvania|Dauphin]]  
| style="vertical-align: top" | 1785<br>
+
| style="vertical-align: top;" | 1785<br>  
| style="vertical-align: top" | Lancaster<br>
+
| style="vertical-align: top;" | Lancaster<br>  
| style="vertical-align: top" | From it came part of&nbsp;Lebanon County in 1813.<br>
+
| style="vertical-align: top;" | From it came part of&nbsp;Lebanon County in 1813.<br>
 
|-
 
|-
| style="vertical-align: top" | [[Delaware County, Pennsylvania|Delaware]]  
+
| style="vertical-align: top;" | [[Delaware County, Pennsylvania|Delaware]]  
| style="vertical-align: top" | 1789<br>
+
| style="vertical-align: top;" | 1789<br>  
| style="vertical-align: top" | Chester<br>
+
| style="vertical-align: top;" | Chester<br>  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>
 
|-
 
|-
| style="vertical-align: top" | [[Elk County, Pennsylvania|Elk]]  
+
| style="vertical-align: top;" | [[Elk County, Pennsylvania|Elk]]  
| style="vertical-align: top" | 1843<br>
+
| style="vertical-align: top;" | 1843<br>  
| style="vertical-align: top" | Jefferson, Clearfield,&nbsp;McKean<br>
+
| style="vertical-align: top;" | Jefferson, Clearfield,&nbsp;McKean<br>  
| style="vertical-align: top" | From it came part of Cameron Co. in 1860.<br>
+
| style="vertical-align: top;" | From it came part of Cameron Co. in 1860.<br>
 
|-
 
|-
| style="vertical-align: top" | [[Erie County, Pennsylvania|Erie]]  
+
| style="vertical-align: top;" | [[Erie County, Pennsylvania|Erie]]  
| style="vertical-align: top" | 1800<br>
+
| style="vertical-align: top;" | 1800<br>  
| style="vertical-align: top" | Allegheny (Attached to Crawford Co. for several years.)  
+
| style="vertical-align: top;" | Allegheny (Attached to Crawford Co. for several years.)  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>
 
|-
 
|-
| style="vertical-align: top" | [[Fayette County, Pennsylvania|Fayette]]  
+
| style="vertical-align: top;" | [[Fayette County, Pennsylvania|Fayette]]  
| style="vertical-align: top" | 1783<br>
+
| style="vertical-align: top;" | 1783<br>  
| style="vertical-align: top" | Westmoreland<br>
+
| style="vertical-align: top;" | Westmoreland<br>  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>
 
|-
 
|-
| style="vertical-align: top" | [[Forest County, Pennsylvania|Forest]]  
+
| style="vertical-align: top;" | [[Forest County, Pennsylvania|Forest]]  
| style="vertical-align: top" | 1848<br>
+
| style="vertical-align: top;" | 1848<br>  
| style="vertical-align: top" | Jefferson<br>
+
| style="vertical-align: top;" | Jefferson<br>  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>
 
|-
 
|-
| style="vertical-align: top" | [[Franklin County, Pennsylvania|Franklin]]  
+
| style="vertical-align: top;" | [[Franklin County, Pennsylvania|Franklin]]  
| style="vertical-align: top" | 1784 <br>
+
| style="vertical-align: top;" | 1784 <br>  
| style="vertical-align: top" | Cumberland <br>
+
| style="vertical-align: top;" | Cumberland <br>  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>
 
|-
 
|-
| style="vertical-align: top" | [[Fulton County, Pennsylvania|Fulton]]  
+
| style="vertical-align: top;" | [[Fulton County, Pennsylvania|Fulton]]  
| style="vertical-align: top" | 1850 <br>
+
| style="vertical-align: top;" | 1850 <br>  
| style="vertical-align: top" | Bedford <br>
+
| style="vertical-align: top;" | Bedford <br>  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>
 
|-
 
|-
| style="vertical-align: top" | [[Greene County, Pennsylvania|Greene]]  
+
| style="vertical-align: top;" | [[Greene County, Pennsylvania|Greene]]  
| style="vertical-align: top" | 1796 <br>
+
| style="vertical-align: top;" | 1796 <br>  
| style="vertical-align: top" | Washington <br>
+
| style="vertical-align: top;" | Washington <br>  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>
 
|-
 
|-
| style="vertical-align: top" | [[Huntingdon County, Pennsylvania|Huntingdon]]  
+
| style="vertical-align: top;" | [[Huntingdon County, Pennsylvania|Huntingdon]]  
| style="vertical-align: top" | 1787 <br>
+
| style="vertical-align: top;" | 1787 <br>  
| style="vertical-align: top" | Bedford <br>
+
| style="vertical-align: top;" | Bedford <br>  
| style="vertical-align: top" | From it came part of Centre Co. in 1800, parts of Cambria and Clearfield counties in 1804, and part of Blair Co. in 1846.
+
| style="vertical-align: top;" | From it came part of Centre Co. in 1800, parts of Cambria and Clearfield counties in 1804, and part of Blair Co. in 1846.
 
|-
 
|-
| style="vertical-align: top" | [[Indiana County, Pennsylvania|Indiana]]  
+
| style="vertical-align: top;" | [[Indiana County, Pennsylvania|Indiana]]  
| style="vertical-align: top" | 1803 <br>
+
| style="vertical-align: top;" | 1803 <br>  
| style="vertical-align: top" | Westmoreland,&nbsp;Lycoming (attached to Westmoreland Co. until 1806 when county was organized.)  
+
| style="vertical-align: top;" | Westmoreland,&nbsp;Lycoming (attached to Westmoreland Co. until 1806 when county was organized.)  
| style="vertical-align: top" | &nbsp;-- <br>
+
| style="vertical-align: top;" | &nbsp;-- <br>
 
|-
 
|-
| style="vertical-align: top" | [[Jefferson County, Pennsylvania|Jefferson]]  
+
| style="vertical-align: top;" | [[Jefferson County, Pennsylvania|Jefferson]]  
| style="vertical-align: top" | 1804 <br>
+
| style="vertical-align: top;" | 1804 <br>  
| style="vertical-align: top" | Lycoming (Attached to Westmoreland Co. until 1806, then to Indiana Co. until 1830.)  
+
| style="vertical-align: top;" | Lycoming (Attached to Westmoreland Co. until 1806, then to Indiana Co. until 1830.)  
| style="vertical-align: top" | From it came part of Elk Co. in 1843 and&nbsp;part of Forest Co. in 1848.<br>
+
| style="vertical-align: top;" | From it came part of Elk Co. in 1843 and&nbsp;part of Forest Co. in 1848.<br>
 
|-
 
|-
| style="vertical-align: top" | [[Juniata County, Pennsylvania|Juniata]]  
+
| style="vertical-align: top;" | [[Juniata County, Pennsylvania|Juniata]]  
| style="vertical-align: top" | 1831 <br>
+
| style="vertical-align: top;" | 1831 <br>  
| style="vertical-align: top" | Mifflin <br>
+
| style="vertical-align: top;" | Mifflin <br>  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>
 
|-
 
|-
| style="vertical-align: top" | [[Lackawanna County, Pennsylvania|Lackawanna]]  
+
| style="vertical-align: top;" | [[Lackawanna County, Pennsylvania|Lackawanna]]  
| style="vertical-align: top" | 1878 <br>
+
| style="vertical-align: top;" | 1878 <br>  
| style="vertical-align: top" | Luzerne <br>
+
| style="vertical-align: top;" | Luzerne <br>  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>
 
|-
 
|-
| style="vertical-align: top" | [[Lancaster County, Pennsylvania|Lancaster]]  
+
| style="vertical-align: top;" | [[Lancaster County, Pennsylvania|Lancaster]]  
| style="vertical-align: top" | 1728 <br>
+
| style="vertical-align: top;" | 1728 <br>  
| style="vertical-align: top" | Chester (Earlier was part of Susquehannock Indian territory.)  
+
| style="vertical-align: top;" | Chester (Earlier was part of Susquehannock Indian territory.)  
| style="vertical-align: top" | From it came York Co.&nbsp;in 1748, Cumberland Co.&nbsp;in 1750, part of Berks Co.&nbsp;in 1751, part of Northumberland Co. in 1772, Dauphin Co. in 1785, part of Lebanon Co. in 1813.
+
| style="vertical-align: top;" | From it came York Co.&nbsp;in 1748, Cumberland Co.&nbsp;in 1750, part of Berks Co.&nbsp;in 1751, part of Northumberland Co. in 1772, Dauphin Co. in 1785, part of Lebanon Co. in 1813.
 
|-
 
|-
| style="vertical-align: top" | [[Lawrence County, Pennsylvania|Lawrence]]  
+
| style="vertical-align: top;" | [[Lawrence County, Pennsylvania|Lawrence]]  
| style="vertical-align: top" | 1849 <br>
+
| style="vertical-align: top;" | 1849 <br>  
| style="vertical-align: top" | Beaver, Mercer<br>
+
| style="vertical-align: top;" | Beaver, Mercer<br>  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>
 
|-
 
|-
| style="vertical-align: top" | [[Lebanon County, Pennsylvania|Lebanon]]  
+
| style="vertical-align: top;" | [[Lebanon County, Pennsylvania|Lebanon]]  
| style="vertical-align: top" | 1813 <br>
+
| style="vertical-align: top;" | 1813 <br>  
| style="vertical-align: top" | Dauphin,&nbsp;Lancaster<br>
+
| style="vertical-align: top;" | Dauphin,&nbsp;Lancaster<br>  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>
 
|-
 
|-
| style="vertical-align: top" | [[Lehigh County, Pennsylvania|Lehigh]]  
+
| style="vertical-align: top;" | [[Lehigh County, Pennsylvania|Lehigh]]  
| style="vertical-align: top" | 1812 <br>
+
| style="vertical-align: top;" | 1812 <br>  
| style="vertical-align: top" | Northampton <br>
+
| style="vertical-align: top;" | Northampton <br>  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>
 
|-
 
|-
| style="vertical-align: top" | [[Luzerne County, Pennsylvania|Luzerne]]  
+
| style="vertical-align: top;" | [[Luzerne County, Pennsylvania|Luzerne]]  
| style="vertical-align: top" | 1786 <br>
+
| style="vertical-align: top;" | 1786 <br>  
| style="vertical-align: top" | Northumberland <br>
+
| style="vertical-align: top;" | Northumberland <br>  
| style="vertical-align: top" | From it came part of Bradford Co. in 1810, Susquehanna Co. in 1810, part of Schuylkill Co. in 1818, Wyoming Co. in 1842, Lackawanna Co. in 1878.
+
| style="vertical-align: top;" | From it came part of Bradford Co. in 1810, Susquehanna Co. in 1810, part of Schuylkill Co. in 1818, Wyoming Co. in 1842, Lackawanna Co. in 1878.
 
|-
 
|-
| style="vertical-align: top" | [[Lycoming County, Pennsylvania|Lycoming]]  
+
| style="vertical-align: top;" | [[Lycoming County, Pennsylvania|Lycoming]]  
| style="vertical-align: top" | 1795 <br>
+
| style="vertical-align: top;" | 1795 <br>  
| style="vertical-align: top" | Northumberland <br>
+
| style="vertical-align: top;" | Northumberland <br>  
| style="vertical-align: top" | From it in 1800 came pts. of Armstrong, Venango, Warren; in 1803 pt. of Indiana Co.;in 1804 pt. of Clearfield Co., all of Jefferson, McKean, Potter, Tioga; in 1810 part of Bradford; in 1839 part of Clinton; in 1847 pt. of Sullivan.
+
| style="vertical-align: top;" | From it in 1800 came pts. of Armstrong, Venango, Warren; in 1803 pt. of Indiana Co.;in 1804 pt. of Clearfield Co., all of Jefferson, McKean, Potter, Tioga; in 1810 part of Bradford; in 1839 part of Clinton; in 1847 pt. of Sullivan.
 
|-
 
|-
| style="vertical-align: top" | [[McKean County, Pennsylvania|McKean]]  
+
| style="vertical-align: top;" | [[McKean County, Pennsylvania|McKean]]  
| style="vertical-align: top" | 1804  
+
| style="vertical-align: top;" | 1804  
| style="vertical-align: top" | Lycoming (Attached to Centre Co. 1804-1814, then to Lycoming Co. and Potter Co. until organized in 1826.)  
+
| style="vertical-align: top;" | Lycoming (Attached to Centre Co. 1804-1814, then to Lycoming Co. and Potter Co. until organized in 1826.)  
| style="vertical-align: top" | From it came part of Elk Co. in 1843 and part of Cameron Co. in 1860.
+
| style="vertical-align: top;" | From it came part of Elk Co. in 1843 and part of Cameron Co. in 1860.
 
|-
 
|-
| style="vertical-align: top" | [[Mercer County, Pennsylvania|Mercer]]  
+
| style="vertical-align: top;" | [[Mercer County, Pennsylvania|Mercer]]  
| style="vertical-align: top" | 1800&nbsp; <br>
+
| style="vertical-align: top;" | 1800&nbsp; <br>  
| style="vertical-align: top" | Allegheny (Attached to Crawford Co.; organized in 1804.)  
+
| style="vertical-align: top;" | Allegheny (Attached to Crawford Co.; organized in 1804.)  
| style="vertical-align: top" | From it came part of Lawrence Co.&nbsp;In 1849.<br>
+
| style="vertical-align: top;" | From it came part of Lawrence Co.&nbsp;In 1849.<br>
 
|-
 
|-
| style="vertical-align: top" | [[Mifflin County, Pennsylvania|Mifflin]]  
+
| style="vertical-align: top;" | [[Mifflin County, Pennsylvania|Mifflin]]  
| style="vertical-align: top" | 1789&nbsp; <br>
+
| style="vertical-align: top;" | 1789&nbsp; <br>  
| style="vertical-align: top" | Cumberland,&nbsp;Northumberland<br>
+
| style="vertical-align: top;" | Cumberland,&nbsp;Northumberland<br>  
| style="vertical-align: top" | From it came part of Centre Co. in 1800 and part of Juniata Co. in 1831.
+
| style="vertical-align: top;" | From it came part of Centre Co. in 1800 and part of Juniata Co. in 1831.
 
|-
 
|-
| style="vertical-align: top" | [[Monroe County, Pennsylvania|Monroe]]  
+
| style="vertical-align: top;" | [[Monroe County, Pennsylvania|Monroe]]  
| style="vertical-align: top" | 1836  
+
| style="vertical-align: top;" | 1836  
| style="vertical-align: top" | Northampton,&nbsp;Pike  
+
| style="vertical-align: top;" | Northampton,&nbsp;Pike  
| style="vertical-align: top" | From it came&nbsp;part of Carbon Co.&nbsp;In 1843.
+
| style="vertical-align: top;" | From it came&nbsp;part of Carbon Co.&nbsp;In 1843.
 
|-
 
|-
| style="vertical-align: top" | [[Montgomery County, Pennsylvania|Montgomery]]  
+
| style="vertical-align: top;" | [[Montgomery County, Pennsylvania|Montgomery]]  
| style="vertical-align: top" | 1784 <br>
+
| style="vertical-align: top;" | 1784 <br>  
| style="vertical-align: top" | Philadelphia <br>
+
| style="vertical-align: top;" | Philadelphia <br>  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>
 
|-
 
|-
| style="vertical-align: top" | [[Montour County, Pennsylvania|Montour]]  
+
| style="vertical-align: top;" | [[Montour County, Pennsylvania|Montour]]  
| style="vertical-align: top" | 1850 <br>
+
| style="vertical-align: top;" | 1850 <br>  
| style="vertical-align: top" | Columbia <br>
+
| style="vertical-align: top;" | Columbia <br>  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>
 
|-
 
|-
| style="vertical-align: top" | [[Northampton County, Pennsylvania|Northampton]]  
+
| style="vertical-align: top;" | [[Northampton County, Pennsylvania|Northampton]]  
| style="vertical-align: top" | 1751 (org.&nbsp;1752)  
+
| style="vertical-align: top;" | 1751 (org.&nbsp;1752)  
| style="vertical-align: top" | Bucks <br>
+
| style="vertical-align: top;" | Bucks <br>  
| style="vertical-align: top" | From it came part of Northumberland Co. in 1772, Wayne Co. in 1798, part of Schuylkill Co. in 1811, Lehigh Co. in 1812, part of Monroe Co. in 1836, part of Carbon Co. in 1843.
+
| style="vertical-align: top;" | From it came part of Northumberland Co. in 1772, Wayne Co. in 1798, part of Schuylkill Co. in 1811, Lehigh Co. in 1812, part of Monroe Co. in 1836, part of Carbon Co. in 1843.
 
|-
 
|-
| style="vertical-align: top" | [[Northumberland County, Pennsylvania|Northumberland]]  
+
| style="vertical-align: top;" | [[Northumberland County, Pennsylvania|Northumberland]]  
| style="vertical-align: top" | 1772 <br>
+
| style="vertical-align: top;" | 1772 <br>  
| style="vertical-align: top" | Lancaster, Cumberland, Berks, Bedford, Northampton  
+
| style="vertical-align: top;" | Lancaster, Cumberland, Berks, Bedford, Northampton  
| style="vertical-align: top" | From it came Luzerne Co. in 1786, part of Mifflin Co. in 1789, Lycoming Co. in 1795, part of Centre Co. in 1800, Columbia and Union counties in 1813.
+
| style="vertical-align: top;" | From it came Luzerne Co. in 1786, part of Mifflin Co. in 1789, Lycoming Co. in 1795, part of Centre Co. in 1800, Columbia and Union counties in 1813.
 
|-
 
|-
| style="vertical-align: top" | [[Ontario County, Pennsylvania|Ontario]] (extinct: See Bradford Co.)<br>
+
| style="vertical-align: top;" | [[Ontario County, Pennsylvania|Ontario]] (extinct: See Bradford Co.)<br>  
| style="vertical-align: top" | <br>
+
| style="vertical-align: top;" | <br>  
| style="vertical-align: top" | <br>
+
| style="vertical-align: top;" | <br>  
| style="vertical-align: top" | <br>
+
| style="vertical-align: top;" | <br>
 
|-
 
|-
| style="vertical-align: top" | [[Perry County, Pennsylvania|Perry]]  
+
| style="vertical-align: top;" | [[Perry County, Pennsylvania|Perry]]  
| style="vertical-align: top" | 1820 <br>
+
| style="vertical-align: top;" | 1820 <br>  
| style="vertical-align: top" | Cumberland <br>
+
| style="vertical-align: top;" | Cumberland <br>  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>
 
|-
 
|-
| style="vertical-align: top" | [[Philadelphia County, Pennsylvania|Philadelphia]]  
+
| style="vertical-align: top;" | [[Philadelphia County, Pennsylvania|Philadelphia]]  
| style="vertical-align: top" | 1682<br>
+
| style="vertical-align: top;" | 1682<br>  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>  
| style="vertical-align: top" | From it came part of Berks County in 1751 and Montgomery County in 1784. In 1854 all townships, districts and other parts of county consolidated into the City of Philadelphia.
+
| style="vertical-align: top;" | From it came part of Berks County in 1751 and Montgomery County in 1784. In 1854 all townships, districts and other parts of county consolidated into the City of Philadelphia.
 
|-
 
|-
| style="vertical-align: top" | [[Pike County, Pennsylvania|Pike]]  
+
| style="vertical-align: top;" | [[Pike County, Pennsylvania|Pike]]  
| style="vertical-align: top" | 1814 <br>
+
| style="vertical-align: top;" | 1814 <br>  
| style="vertical-align: top" | Wayne <br>
+
| style="vertical-align: top;" | Wayne <br>  
| style="vertical-align: top" | From it came part of Monroe Co. in 1836.<br>
+
| style="vertical-align: top;" | From it came part of Monroe Co. in 1836.<br>
 
|-
 
|-
| style="vertical-align: top" | [[Potter County, Pennsylvania|Potter]]  
+
| style="vertical-align: top;" | [[Potter County, Pennsylvania|Potter]]  
| style="vertical-align: top" | 1804 <br>
+
| style="vertical-align: top;" | 1804 <br>  
| style="vertical-align: top" | Lycoming (Attached to Lycoming Co. but elected joint commissioners with McKean Co. in 1814; became separate county in 1824; organized in 1835.)  
+
| style="vertical-align: top;" | Lycoming (Attached to Lycoming Co. but elected joint commissioners with McKean Co. in 1814; became separate county in 1824; organized in 1835.)  
| style="vertical-align: top" | From it came part of Cameron Co.&nbsp;in 1860.<br>
+
| style="vertical-align: top;" | From it came part of Cameron Co.&nbsp;in 1860.<br>
 
|-
 
|-
| style="vertical-align: top" | [[Schuylkill County, Pennsylvania|Schuylkill]]  
+
| style="vertical-align: top;" | [[Schuylkill County, Pennsylvania|Schuylkill]]  
| style="vertical-align: top" | 1811 <br>
+
| style="vertical-align: top;" | 1811 <br>  
| style="vertical-align: top" | Berks, Northampton.&nbsp;In March 1818 additional land was received from parts of Columbia and Luzerne counties.  
+
| style="vertical-align: top;" | Berks, Northampton.&nbsp;In March 1818 additional land was received from parts of Columbia and Luzerne counties.  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>
 
|-
 
|-
| style="vertical-align: top" | [[Snyder County, Pennsylvania|Snyder]]  
+
| style="vertical-align: top;" | [[Snyder County, Pennsylvania|Snyder]]  
| style="vertical-align: top" | 1855 <br>
+
| style="vertical-align: top;" | 1855 <br>  
| style="vertical-align: top" | Union <br>
+
| style="vertical-align: top;" | Union <br>  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>
 
|-
 
|-
| style="vertical-align: top" | [[Somerset County, Pennsylvania|Somerset]]  
+
| style="vertical-align: top;" | [[Somerset County, Pennsylvania|Somerset]]  
| style="vertical-align: top" | 1795 <br>
+
| style="vertical-align: top;" | 1795 <br>  
| style="vertical-align: top" | Bedford<br>
+
| style="vertical-align: top;" | Bedford<br>  
| style="vertical-align: top" | From it came&nbsp;part of Cambria Co.&nbsp;in 1804.<br>
+
| style="vertical-align: top;" | From it came&nbsp;part of Cambria Co.&nbsp;in 1804.<br>
 
|-
 
|-
| style="vertical-align: top" | [[Sullivan County, Pennsylvania|Sullivan]]  
+
| style="vertical-align: top;" | [[Sullivan County, Pennsylvania|Sullivan]]  
| style="vertical-align: top" | 1847 <br>
+
| style="vertical-align: top;" | 1847 <br>  
| style="vertical-align: top" | Lycoming <br>
+
| style="vertical-align: top;" | Lycoming <br>  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>
 
|-
 
|-
| style="vertical-align: top" | [[Susquehanna County, Pennsylvania|Susquehanna]]  
+
| style="vertical-align: top;" | [[Susquehanna County, Pennsylvania|Susquehanna]]  
| style="vertical-align: top" | 1810 (org. 1812)<br>
+
| style="vertical-align: top;" | 1810 (org. 1812)<br>  
| style="vertical-align: top" | Luzerne <br>
+
| style="vertical-align: top;" | Luzerne <br>  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>
 
|-
 
|-
| style="vertical-align: top" | [[Tioga County, Pennsylvania|Tioga]]  
+
| style="vertical-align: top;" | [[Tioga County, Pennsylvania|Tioga]]  
| style="vertical-align: top" | 1804 <br>
+
| style="vertical-align: top;" | 1804 <br>  
| style="vertical-align: top" | Lycoming (Tioga Co. was part of land claimed by Connecticut.  
+
| style="vertical-align: top;" | Lycoming (Tioga Co. was part of land claimed by Connecticut.  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>
 
|-
 
|-
| style="vertical-align: top" | [[Union County, Pennsylvania|Union]]  
+
| style="vertical-align: top;" | [[Union County, Pennsylvania|Union]]  
| style="vertical-align: top" | 1813 <br>
+
| style="vertical-align: top;" | 1813 <br>  
| style="vertical-align: top" | Northumberland <br>
+
| style="vertical-align: top;" | Northumberland <br>  
| style="vertical-align: top" | From it came Snyder County&nbsp;In 1855.
+
| style="vertical-align: top;" | From it came Snyder County&nbsp;In 1855.
 
|-
 
|-
| style="vertical-align: top" | [[Venango County, Pennsylvania|Venango]]  
+
| style="vertical-align: top;" | [[Venango County, Pennsylvania|Venango]]  
| style="vertical-align: top" | 1800 <br>
+
| style="vertical-align: top;" | 1800 <br>  
| style="vertical-align: top" | Allegheny,&nbsp;Lycoming (Attached to Crawford Co.; organized in 1805.)  
+
| style="vertical-align: top;" | Allegheny,&nbsp;Lycoming (Attached to Crawford Co.; organized in 1805.)  
| style="vertical-align: top" | From it came&nbsp;part of Clarion Co. was formed in 1839 and part of Forest Co. in 1866.
+
| style="vertical-align: top;" | From it came&nbsp;part of Clarion Co. was formed in 1839 and part of Forest Co. in 1866.
 
|-
 
|-
| style="vertical-align: top" | [[Warren County, Pennsylvania|Warren]]  
+
| style="vertical-align: top;" | [[Warren County, Pennsylvania|Warren]]  
| style="vertical-align: top" | 1800 <br>
+
| style="vertical-align: top;" | 1800 <br>  
| style="vertical-align: top" | Allegheny,&nbsp;Lycoming (organized in 1819. Attached to Crawford Co. until 1805, the to Venango Co. until 1819.)  
+
| style="vertical-align: top;" | Allegheny,&nbsp;Lycoming (organized in 1819. Attached to Crawford Co. until 1805, the to Venango Co. until 1819.)  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>
 
|-
 
|-
| style="vertical-align: top" | [[Washington County, Pennsylvania|Washington]]  
+
| style="vertical-align: top;" | [[Washington County, Pennsylvania|Washington]]  
| style="vertical-align: top" | 1781 <br>
+
| style="vertical-align: top;" | 1781 <br>  
| style="vertical-align: top" | Westmoreland <br><br>
+
| style="vertical-align: top;" | Westmoreland <br><br>  
| style="vertical-align: top" | From it came part of Allegheny Co. in 1788, Greene Co. in 1796, and part of Beaver Co. in 1800.
+
| style="vertical-align: top;" | From it came part of Allegheny Co. in 1788, Greene Co. in 1796, and part of Beaver Co. in 1800.
 
|-
 
|-
| style="vertical-align: top" | [[Wayne County, Pennsylvania|Wayne]]  
+
| style="vertical-align: top;" | [[Wayne County, Pennsylvania|Wayne]]  
| style="vertical-align: top" | 1798  
+
| style="vertical-align: top;" | 1798  
| style="vertical-align: top" | Northampton  
+
| style="vertical-align: top;" | Northampton  
| style="vertical-align: top" | From it came Pike County&nbsp;in 1814.
+
| style="vertical-align: top;" | From it came Pike County&nbsp;in 1814.
 
|-
 
|-
| style="vertical-align: top" | [[Westmoreland County, Pennsylvania|Westmoreland]]  
+
| style="vertical-align: top;" | [[Westmoreland County, Pennsylvania|Westmoreland]]  
| style="vertical-align: top" | 1773  
+
| style="vertical-align: top;" | 1773  
| style="vertical-align: top" | Bedford  
+
| style="vertical-align: top;" | Bedford  
| style="vertical-align: top" | From it came Washington Co. in 1781, Fayette Co. in 1783, part of Allegheny Co. in 1788, part of Armstrong Co. in 1800, part of Indiana Co. in 1803.
+
| style="vertical-align: top;" | From it came Washington Co. in 1781, Fayette Co. in 1783, part of Allegheny Co. in 1788, part of Armstrong Co. in 1800, part of Indiana Co. in 1803.
 
|-
 
|-
| style="vertical-align: top" | [[Wyoming County, Pennsylvania|Wyoming]]  
+
| style="vertical-align: top;" | [[Wyoming County, Pennsylvania|Wyoming]]  
| style="vertical-align: top" | 1842 <br>
+
| style="vertical-align: top;" | 1842 <br>  
| style="vertical-align: top" | Luzerne <br>
+
| style="vertical-align: top;" | Luzerne <br>  
| style="vertical-align: top" | &nbsp;--<br>
+
| style="vertical-align: top;" | &nbsp;--<br>
 
|-
 
|-
| style="vertical-align: top" | [[York County, Pennsylvania|York]]  
+
| style="vertical-align: top;" | [[York County, Pennsylvania|York]]  
| style="vertical-align: top" | 1748 (org. 1749)<br>
+
| style="vertical-align: top;" | 1748 (org. 1749)<br>  
| style="vertical-align: top" | Lancaster <br>
+
| style="vertical-align: top;" | Lancaster <br>  
| style="vertical-align: top" | From it came Adams County in 1800.<br>
+
| style="vertical-align: top;" | From it came Adams County in 1800.<br>
 
|}
 
|}
  
 
Extinct or Renamed Counties: <br>| [[Ontario County, Pennsylvania|Ontario]] |
 
Extinct or Renamed Counties: <br>| [[Ontario County, Pennsylvania|Ontario]] |
 +
 +
[[Category: United States]]
 +
[[Category: United States County Creations ]]

Revision as of 04:25, 13 March 2009

County
Year
Created

Parent County
Year Split and Child County
Adams 1800
York  --
Allegheny 1788 Washington, Westmoreland In 1800 parts of Armstrong, Beaver, Venango, and Warren counties and all of Butler, Crawford, Erie, and Mercer counties came from Allegheny Co.
Armstrong 1800
Allegheny, Westmoreland, Lycoming. Attached to Westmoreland County until 1805.  Part of Clarion County was formed in 1839 from Armstrong Co.
Beaver 1800
Allegheny, Washington. Attached to Allegheny Co. until 1803. Part of Lawrence County was formed in 1849 from Beaver Co.
Bedford 1771 Cumberland From it came part of Northumberland Co. in 1772, Westmoreland Co. in 1773, Huntingdon Co. in 1787, Somerset Co. in 1795, part of Cambria Co. in 1804, part of Blair Co. in 1846, Fulton Co. in 1850.
Berks 1751 (org. 1752) Philadelphia, Chester, Lancaster
From it came part of Northumberland Co. in 1772 and part of Schuylkill Co. in 1811.
Blair 1846 Huntingdon, Bedford  --
Bradford (first named Ontario County) 1810 (org. 1812) Luzerne and Lycoming  --
Bucks 1682  -- In 1751 Northampton County was set off.
Butler 1800 Allegheny  --
Cambria 1804 (org. 1807) Huntingdon, Somerset, and Bedford  --
Cameron 1860
Clinton, McKean, Elk, Potter
 --
Carbon 1843
Northampton, Monroe  --
Centre 1800
Huntingdon, Lycoming, Mifflin, Northumberland Part of Clinton County was formed in 1839 from Centre Co.
Chester 1682  --
From it came Lancaster in 1728, part of Berks in 1751, Delaware in 1789.
Clarion 1682
 --
From it came these counties: Lancaster in 1728, part of Berks in 1751, Delaware in 1789.
Clearfield 1804 (org. 1812) Huntingdon and Lycoming (Clearfield did not have its own courts until 1822.) Part of Elk Co. was formed in 1843 from Clearfield Co.
Clinton 1839
Centre and Lycoming
In 1860 part of Cameron County was formed from Clinton Co.
Columbia 1813
Northumberland
In 1818 additional land went to Schuylkill Co. In 1850 Montour Co. was formed from Columbia Co.
Crawford 1800
Allegheny
No counties were formed from Crawford Co. Venango, Erie, Warren, and Mercer counties were attached to Crawford Co. for several years.
Cumberland 1750
Lancaster
From it came Bedford Co., in 1771, part of Northumberland Co. in 1772, Franklin Co. in 1784, part of Mifflin Co. in 1789, Perry Co. in 1820.
Dauphin 1785
Lancaster
From it came part of Lebanon County in 1813.
Delaware 1789
Chester
 --
Elk 1843
Jefferson, Clearfield, McKean
From it came part of Cameron Co. in 1860.
Erie 1800
Allegheny (Attached to Crawford Co. for several years.)  --
Fayette 1783
Westmoreland
 --
Forest 1848
Jefferson
 --
Franklin 1784
Cumberland
 --
Fulton 1850
Bedford
 --
Greene 1796
Washington
 --
Huntingdon 1787
Bedford
From it came part of Centre Co. in 1800, parts of Cambria and Clearfield counties in 1804, and part of Blair Co. in 1846.
Indiana 1803
Westmoreland, Lycoming (attached to Westmoreland Co. until 1806 when county was organized.)  --
Jefferson 1804
Lycoming (Attached to Westmoreland Co. until 1806, then to Indiana Co. until 1830.) From it came part of Elk Co. in 1843 and part of Forest Co. in 1848.
Juniata 1831
Mifflin
 --
Lackawanna 1878
Luzerne
 --
Lancaster 1728
Chester (Earlier was part of Susquehannock Indian territory.) From it came York Co. in 1748, Cumberland Co. in 1750, part of Berks Co. in 1751, part of Northumberland Co. in 1772, Dauphin Co. in 1785, part of Lebanon Co. in 1813.
Lawrence 1849
Beaver, Mercer
 --
Lebanon 1813
Dauphin, Lancaster
 --
Lehigh 1812
Northampton
 --
Luzerne 1786
Northumberland
From it came part of Bradford Co. in 1810, Susquehanna Co. in 1810, part of Schuylkill Co. in 1818, Wyoming Co. in 1842, Lackawanna Co. in 1878.
Lycoming 1795
Northumberland
From it in 1800 came pts. of Armstrong, Venango, Warren; in 1803 pt. of Indiana Co.;in 1804 pt. of Clearfield Co., all of Jefferson, McKean, Potter, Tioga; in 1810 part of Bradford; in 1839 part of Clinton; in 1847 pt. of Sullivan.
McKean 1804 Lycoming (Attached to Centre Co. 1804-1814, then to Lycoming Co. and Potter Co. until organized in 1826.) From it came part of Elk Co. in 1843 and part of Cameron Co. in 1860.
Mercer 1800 
Allegheny (Attached to Crawford Co.; organized in 1804.) From it came part of Lawrence Co. In 1849.
Mifflin 1789 
Cumberland, Northumberland
From it came part of Centre Co. in 1800 and part of Juniata Co. in 1831.
Monroe 1836 Northampton, Pike From it came part of Carbon Co. In 1843.
Montgomery 1784
Philadelphia
 --
Montour 1850
Columbia
 --
Northampton 1751 (org. 1752) Bucks
From it came part of Northumberland Co. in 1772, Wayne Co. in 1798, part of Schuylkill Co. in 1811, Lehigh Co. in 1812, part of Monroe Co. in 1836, part of Carbon Co. in 1843.
Northumberland 1772
Lancaster, Cumberland, Berks, Bedford, Northampton From it came Luzerne Co. in 1786, part of Mifflin Co. in 1789, Lycoming Co. in 1795, part of Centre Co. in 1800, Columbia and Union counties in 1813.
Ontario (extinct: See Bradford Co.)



Perry 1820
Cumberland
 --
Philadelphia 1682
 --
From it came part of Berks County in 1751 and Montgomery County in 1784. In 1854 all townships, districts and other parts of county consolidated into the City of Philadelphia.
Pike 1814
Wayne
From it came part of Monroe Co. in 1836.
Potter 1804
Lycoming (Attached to Lycoming Co. but elected joint commissioners with McKean Co. in 1814; became separate county in 1824; organized in 1835.) From it came part of Cameron Co. in 1860.
Schuylkill 1811
Berks, Northampton. In March 1818 additional land was received from parts of Columbia and Luzerne counties.  --
Snyder 1855
Union
 --
Somerset 1795
Bedford
From it came part of Cambria Co. in 1804.
Sullivan 1847
Lycoming
 --
Susquehanna 1810 (org. 1812)
Luzerne
 --
Tioga 1804
Lycoming (Tioga Co. was part of land claimed by Connecticut.  --
Union 1813
Northumberland
From it came Snyder County In 1855.
Venango 1800
Allegheny, Lycoming (Attached to Crawford Co.; organized in 1805.) From it came part of Clarion Co. was formed in 1839 and part of Forest Co. in 1866.
Warren 1800
Allegheny, Lycoming (organized in 1819. Attached to Crawford Co. until 1805, the to Venango Co. until 1819.)  --
Washington 1781
Westmoreland

From it came part of Allegheny Co. in 1788, Greene Co. in 1796, and part of Beaver Co. in 1800.
Wayne 1798 Northampton From it came Pike County in 1814.
Westmoreland 1773 Bedford From it came Washington Co. in 1781, Fayette Co. in 1783, part of Allegheny Co. in 1788, part of Armstrong Co. in 1800, part of Indiana Co. in 1803.
Wyoming 1842
Luzerne
 --
York 1748 (org. 1749)
Lancaster
From it came Adams County in 1800.

Extinct or Renamed Counties:
| Ontario |