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Pennsylvania Genealogy By County

Adams County1800Parts of York County.Gettysburg
Allegheny County1788Parts of Washington and Westmoreland Counties.Pittsburgh
Armstrong County1800Parts of Allegheny, Lycoming, and Westmoreland Counties.Kittanning
Beaver County1800Parts of Allegheny and Washington Counties.Beaver
Bedford County1771Parts of Cumberland County.Bedford
Berks County1752Parts of Chester, Lancaster and Philadelphia Counties.Reading
Blair County1846Parts of Huntingdon and Bedford Counties.Hollidaysburg
Bradford County1810Parts of Luzerne and Lycoming Counties; originally called Ontario County, renamed as Bradford County in 1812.Towanda
Bucks County1682One of the original counties at the formation of PennsylvaniaDoylestown
Butler County1800Parts of Allegheny County.Butler
Cambria County1804Parts of Somerset and Huntingdon Counties.Ebensburg
Cameron County1860Parts of Clinton, Elk, McKean, and Potter Counties.Emporium
Carbon County1843Parts of Monroe and Northampton Counties.Jim Thorpe
Centre County1800Parts of Lycoming, Mifflin, Northumberland, and Huntingdon Counties.Bellefonte
Chester County1682One of the original counties at the formation of Pennsylvania.West Chester
Clarion County1839Parts of Venango and Armstrong Counties.Clarion
Clearfield County1804Parts of Lycoming and Huntingdon Counties; Clearfield functioned as a part of Centre County for judiciary purposes until 1822.Clearfield
Clinton County1839Parts of Lycoming and Centre Counties.Lock Haven
Columbia County1813Parts of Northumberland and Luzerne Counties.Bloomsburg
Crawford County1800Parts of Allegheny County.Meadville
Cumberland County1750Parts of Lancaster County.Carlisle
Dauphin County1785Parts of Lancaster County.Harrisburg
Delaware County1789Parts of Chester County.Media
Elk County1843Parts of Jefferson, McKean, and Clearfield Counties.Ridgway
Erie County1800Parts of Allegheny County; attached to Crawford County until 1803.Erie
Fayette County1783Parts of Westmoreland County.Uniontown
Forest County1848Parts of Jefferson County; attached to Jefferson County until 1857.Tionesta
Franklin County1784Parts of Cumberland County.Chambersburg
Fulton County1850Parts of Bedford County.McConnellsburg
Greene County1796Parts of Washington County.Waynesburg
Huntingdon County1787Parts of Bedford County.Huntingdon
Indiana County1803Parts of Lycoming and Westmoreland Counties; it was attached to Westmoreland County until 1806.Indiana
Jefferson County1804Parts of Lycoming County. Attached to Westmoreland County until 1806 and to Indiana County until 1830.Brookville
Juniata County1831Parts of Mifflin County.Mifflintown
Lackawanna County1878Parts of Luzerne County.Scranton
Lancaster County1729Parts of Chester County.Lancaster
Lawrence County1849Parts of Beaver and Mercer Counties.New Castle
Lebanon County1813Parts of Dauphin and Lancaster Counties.Lebanon
Lehigh County1812Parts of Northampton County.Allentown
Luzerne County1786Parts of Northumberland County.Wilkes-Barre
Lycoming County1795Parts of Northumberland County.Williamsport
McKean County1804Parts of Lycoming County; Attached to Centre County until 1814 and to Lycoming County until 1826 for judicial and elective purposes. McKean was fully organized only in 1826.Smethport
Mercer County1800Parts of Allegheny County.Mercer
Mifflin County1789Parts of Cumberland and Northumberland Counties.Lewistown
Monroe County1836Parts of Pike and Northampton Counties.Stroudsburg
Montgomery County1784Parts of Philadelphia County.Norristown
Montour County1850Parts of Columbia County.Danville
Northampton County1752Parts of Bucks County.Easton
Northumberland County1772Parts of Lancaster, Berks, Bedford, Cumberland, and Northampton Counties.Sunbury
Perry County1820Parts of Cumberland County.New Bloomfield
Philadelphia County1682One of the original counties at the formation of Pennsylvania.Philadelphia
Pike County1814Parts of Wayne County.Milford
Potter County1804From Lycoming county. Attached to Lycoming County until 1826 and to McKean County until 1835 for judicial purposes, Potter was not fully organized until 1835.Coudersport
Schuylkill County1811Parts of Berks and Northampton Counties.Pottsville
Snyder County1855Parts of Union County.Middleburg
Somerset County1795Parts of Bedford County.Somerset
Sullivan County1847Parts of Lycoming County; attached to Lycoming until 1848.Laporte
Susquehanna County1810Parts of Luzerne County ; attached to Luzerne County until 1812.Montrose
Tioga County1804Parts of Lycoming County; attached to Lycoming until 1812.Wellsboro
Union County1813Parts of Northumberland County.Lewisburg
Venango County1800Parts of Allegheny and Lycoming Counties; attached to until 1805.Franklin
Warren County1800Parts of Allegheny and Lycoming counties; attached to Crawford County until 1805 and then to Venango until Warren was formally organized in 1819.Warren
Washington County1781Parts of Westmoreland County.Washington
Wayne County1798Parts of Northampton County.Honesdale
Westmoreland County1773Parts of Bedford County.Greensburg
Wyoming County1842Parts of Luzerne County.Tunkhannock
York County1749Parts of Lancaster County.York

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