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The purpose of these pages is to document the migration of our ancestors as they came into or passed through Pennsylvania. If you wish to add to a county, please contact the county coordinator. If you wish to become a coordinator, please e-mail me at:
Please make sure Pa Migrations is in the subject line. Thanks
| County | Date Formed | Parent County |
| Adams | 1800 | York |
| Allegheny | 1786 | Washington Westmoreland |
| Armstrong | 1800 | Allegheny, Lycoming Westmoreland |
| Beaver | 1800 | Allegheny,Washington |
| Bedford | 1771 | Cumberland |
| Berks | 1752 | Chester, Lancaster Philadelphia |
| Blair | 1846 | Bedford Huntingdon |
| Bradford | 1810 | Luzerne, Lycoming |
| Bucks | 1682 | Original county |
| Butler | 1800 | Allegheny |
| Cambria | 1804 | Bedford, Huntingdon, Somerset |
| Cameron | 1860 | Clinton, Elk, McKean, Potter |
| Carbon | 1843 | Monroe, Northampton |
| Centre | 1800 | Huntingdon, Lycoming, Mifflin, Northumberland |
| Chester | 1682 | Original County |
| Clarion | 1829 | Armstrong, Venango |
| Clearfield | 1804 | Huntingdon, Lycoming |
| Clinton | 1839 | Centre, Lycoming |
| Columbia | 1813 | Northumberland |
| Crawford | 1800 | Allegheny |
| Cumberland | 1750 | Lancaster |
| Dauphin | 1785 | Lancaster |
| Delaware | 1789 | Chester |
| Elk | 1843 | Clearfield, Jefferson, McKean |
| Erie | 1800 | Allegheny, Crawford |
| Fayette | 1783 | Westmoreland |
| Forest | 1848 | Jefferson, Venango |
| Franklin | 1784 | Cumberland |
| Fulton | 1850 | Bedford |
| Greene | 1796 | Washington |
| Huntingdon | 1796 | Bedford |
| Indiana | 1803 | Lycoming, Westmoreland |
| Jefferson | 1804 | Lycoming |
| Juniata | 1831 | Mifflin |
| Lackawanna | 1878 | Luzerne |
| Lancaster | 1729 | Chester |
| Lawrence | 1849 | Bercer, Mercer |
| Lebanon | 1813 | Dauphin, Lancaster |
| Lehigh | 1812 | Northampton |
| Luzerne | 1786 | Northumberland |
| Lycoming | 1795 | Northumberland |
| McKean | 1804 | Lycoming |
| Mercer | 1800 | Alleghney, Crawford |
| Mifflin | 1789 | Cumberland, Northumberland |
| Monroe | 1836 | Northampton, Pike |
| Montgomery | 1784 | Philadelphia |
| Montour | 1850 | Columbia |
| Northampton | 1752 | Bucks |
| Northumberland | 1752 | Bedford, Berks,Cumberland Lancaster, Northampton |
| Perry | 1820 | Cumberland |
| Philadelphia | 1682 | original county |
| Pike | 1814 | Wayne |
| Potter | 1804 | Lycoming |
| Schuylkill | 1811 | Berks, Northampton |
| Snyder | 1855 | Union |
| Somerset | 1795 | Bedford |
| Sullivan | 1847 | Lycoming |
| Susquehanna | 1810 | Luzerne |
| Snyder | 1855 | Union |
| Tioga | 1804 | Lycoming |
| Union | 1813 | Northumberland |
| Venango | 1800 | Alleghney, Crawford, Lycoming |
| Warren | 1800 | Alleghney, Crawford, Lycoming, Venango |
| Washington | 1781 | Westmoreland |
| Wayne | 1798 | Northampton |
| Westmoreland | 1773 | Bedford |
| Wyoming | 1842 | Luzerne |
| York | 1749 | Lancaster |
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