|
County |
County seat |
Year |
Origin |
Coordinator |
| Adams |
Gettysburg |
1800 |
Parts of
York County. |
|
| Allegheny
|
Pittsburgh |
1788 |
Parts of
Washington and Westmoreland Counties. |
|
| Armstrong
|
Kittanning |
1800 |
Parts of
Allegheny, Lycoming, and Westmoreland Counties. |
|
| Beaver |
Beaver |
1800 |
Parts of
Allegheny and Washington Counties. |
|
|
Bedford |
Bedford |
1771 |
Parts of Cumberland County. |
|
| Berks |
Reading |
1752 |
Parts of
Chester, Lancaster and Philadelphia Counties. |
|
| Blair |
Hollidaysburg |
1846 |
Parts of
Huntingdon and Bedford Counties. |
|
| Bradford |
Towanda |
1810 |
Parts of
Luzerne and Lycoming Counties; Bradford County in 1812. |
|
| Bucks |
Doylestown |
1682 |
One of the
original counties at the formation of Pennsylvania |
|
| Butler |
Butler |
1800 |
Parts of
Allegheny County. |
|
| Cambria |
Ebensburg |
1804 |
Parts of
Somerset and Huntingdon Counties. |
|
| Cameron |
Emporium |
1860 |
Parts of
Clinton, Elk, McKean, and Potter Counties. |
|
| Carbon |
Jim Thorpe |
1843 |
Parts of
Monroe and Northampton Counties. |
|
| Centre |
Bellefonte |
1800 |
Parts of
Lycoming, Mifflin, Northumberland, and Huntingdon
Counties. |
|
Chester  |
West Chester |
1682 |
One of the
original counties |
Dennis Partridge |
| Clarion |
Clarion |
1839 |
Parts of
Venango and Armstrong Counties. |
|
| Clearfield
|
Clearfield |
1804 |
Parts of
Lycoming and Huntingdon Counties |
|
| Clinton |
Lock Haven |
1839 |
Parts of
Lycoming and Centre Counties. |
|
| Columbia
|
Bloomsburg |
1813 |
Parts of
Northumberland and Luzerne Counties. |
|
| Crawford
|
Meadville |
1800 |
Parts of
Allegheny County. |
|
| Cumberland
|
Carlisle |
1750 |
Parts of
Lancaster County. |
|
| Dauphin |
Harrisburg |
1785 |
Parts of
Lancaster County. |
|
| Delaware
|
Media |
1789 |
Parts of
Chester County. |
|
| Elk |
Ridgway |
1843 |
Parts of
Jefferson, McKean, and Clearfield Counties. |
|
| Erie |
Erie |
1800 |
Parts of
Allegheny County; Until 1803. |
|
| Fayette |
Uniontown |
1783 |
Parts of
Westmoreland County. |
|
| Forest |
Tionesta |
1848 |
Parts of
Jefferson County; Until 1857. |
|
| Franklin
|
Chambersburg |
1784 |
Parts of
Cumberland County. |
|
| Fulton |
McConnellsburg |
1850 |
Parts of
Bedford County. |
|
| Greene |
Waynesburg |
1796 |
Parts of
Washington County. |
|
| Huntingdon
|
Huntingdon |
1787 |
Parts of
Bedford County. |
|
| Indiana |
Indiana |
1803 |
Parts of
Lycoming and Westmoreland Counties; Until 1806. |
|
| Jefferson
|
Brookville |
1804 |
Parts of
Lycoming County. Until 1830. |
|
| Juniata |
Mifflintown |
1831 |
Parts of
Mifflin County. |
|
| Lackawanna
|
Scranton |
1878 |
Parts of
Luzerne County. |
|
| Lancaster
|
Lancaster |
1729 |
Parts of
Chester County. |
|
| Lawrence
|
New Castle |
1849 |
Parts of
Beaver and Mercer Counties. |
|
| Lebanon |
Lebanon |
1813 |
Parts of
Dauphin and Lancaster Counties. |
|
| Lehigh |
Allentown |
1812 |
Parts of
Northampton County. |
|
| Luzerne |
Wilkes-Barre |
1786 |
Parts of
Northumberland County. |
|
| Lycoming
|
Williamsport |
1795 |
Parts of
Northumberland County. |
|
| McKean |
Smethport |
1804 |
Parts of
Lycoming County; Fully organized only in 1826. |
|
| Mercer |
Mercer |
1800 |
Parts of
Allegheny County. |
|
|
Mifflin |
Lewistown |
1789 |
Parts of
Cumberland and Northumberland Counties. |
Sheryl McClure |
| Monroe |
Stroudsburg |
1836 |
Parts of
Pike and Northampton Counties. |
|
| Montgomery
|
Norristown |
1784 |
Parts of
Philadelphia County. |
|
| Montour |
Danville |
1850 |
Parts of
Columbia County. |
|
| Northampton
|
Easton |
1752 |
Parts of
Bucks County. |
|
|
Northumberland |
Sunbury |
1772 |
Parts of
Lancaster, Berks, Bedford, Cumberland, and Northampton
Counties. |
|
| Perry |
Bloomfield |
1820 |
Parts of
Cumberland County. |
|
| Philadelphia
|
Philadelphia |
1682 |
One of the
original counties |
|
| Pike |
Milford |
1814 |
Parts of
Wayne County. |
|
| Potter |
Coudersport |
1804 |
From
Lycoming county. Organized until 1835. |
|
| Schuylkill
|
Pottsville |
1811 |
Parts of
Berks and Northampton Counties. |
|
| Snyder |
Middleburg |
1855 |
Parts of
Union County. |
|
| Somerset
|
Somerset |
1795 |
Parts of
Bedford County. |
|
| Sullivan |
Laporte |
1847 |
Parts of
Lycoming County, until 1848. |
|
| Susquehanna
|
Montrose |
1810 |
Parts of
Luzerne County, Until 1812. |
|
| Tioga |
Wellsboro |
1804 |
Parts of
Lycoming County,Until 1812. |
|
| Union |
Lewisburg |
1813 |
Parts of
Northumberland County. |
|
| Venango |
Franklin |
1800 |
Parts of
Allegheny and Lycoming Counties; Until 1805. |
|
| Warren |
Warren |
1800 |
Parts of
Allegheny and Lycoming counties; Organized in 1819. |
|
| Washington
|
Washington |
1781 |
Parts of
Westmoreland County. |
|
| Wayne |
Honesdale |
1798 |
Parts of
Northampton County. |
|
| Westmoreland
|
Greensburg |
1773 |
Parts of
Bedford County. |
|
|
Wyoming |
Tunkhannock |
1842 |
Parts of
Luzerne County. |
Dana Valley |
| York |
York |
1749 |
Parts of
Lancaster County. |
|
