Formation of
Pennsylvania Counties
Formation of Current Pennsylvania Counties
From:
PA
GenWeb Site
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County |
Date Formed |
County of Origin |
County Seat |
|
Adams |
22 Jan 1800 |
York |
Gettysburg |
|
Allegheny |
24 Sep 1788 |
Washington and Westmoreland |
Pittsburgh |
|
Armstrong |
12 Mar 1800 |
Allegheny, Lycoming, and Westmoreland |
Kittanning |
|
Beaver |
12 Mar 1800 |
Allegheny and Washington |
Beaver |
|
Bedford |
9 Mar 1771 |
Cumberland |
Bedford |
|
Berks |
11 Mar 1752 |
Chester, Lancaster, and Philadelphia |
Reading |
|
Blair |
26 Feb 1846 |
Bedford and Huntingdon |
Hollidaysburg |
|
Bradford (Ontario) |
21 Feb 1810 |
Luzerne and Lycoming |
Towanda |
|
Bucks |
1682 |
Original County |
Doylestown |
|
Butler |
12 Mar 1800 |
Allegheny |
Butler |
|
Cambria |
26 Mar 1804 |
Bedford, Huntingdon, and Somerset |
Ebensburg |
|
Cameron |
29 Mar 1860 |
Clinton, Elk, McKean, and Potter |
Emporium |
|
Carbon |
13 Mar 1843 |
Monroe and Northampton |
Jim Thorpe |
|
Centre |
13 Feb 1800 |
Huntingdon, Lycoming, Mifflin, and Northumberland |
Bellefonte |
|
Chester |
1682 |
Original County |
West Chester |
|
Clarion |
11 Mar 1839 |
Armstrong and Venango |
Clarion |
|
Clearfield |
26 Mar 1804 |
Huntingdon and Lycoming |
Clearfield |
|
Clinton |
21 Jun 1839 |
Centre and Lycoming |
Lock Haven |
|
Columbia |
22 Mar 1813 |
Northumberland |
Bloomsburg |
|
Crawford |
12 Mar 1800 |
Allegheny |
Meadville |
|
Cumberland |
27 Jan 1750 |
Lancaster |
Carlisle |
|
Dauphin |
4 Mar 1785 |
Lancaster |
Harrisburg |
|
Delaware |
26 Sep 1789 |
Chester |
Media |
|
Elk |
18 Apr 1843 |
Clearfield, Jefferson, and McKean |
Ridgway |
|
Erie |
12 Mar 1800 |
Allegheny and Crawford |
Erie |
|
Fayette |
26 Sep 1783 |
Westmoreland |
Uniontown |
|
Forest |
11 Apr 1848 |
Jefferson and Venango |
Tionesta |
|
Franklin |
9 Sep 1784 |
Cumberland |
Chambersburg |
|
Fulton |
19 Apr 1850 |
Bedford |
McConnellsburg |
|
Greene |
9 Feb 1796 |
Washington |
Waynesburg |
|
Huntingdon |
20 Sep 1787 |
Bedford |
Huntingdon |
|
Indiana |
30 Mar 1803 |
Lycoming and Westmoreland |
Indiana |
|
Jefferson |
26 Mar 1804 |
Lycoming |
Brookville |
|
Juniata |
2 Mar 1831 |
Mifflin |
Mifflintown |
|
Lackawanna |
13 Aug 1878 |
Luzerne |
Scranton |
|
Lancaster |
10 May 1729 |
Chester |
Lancaster |
|
Lawrence |
20 Mar 1849 |
Beaver and Mercer |
New Castle |
|
Lebanon |
16 Feb 1813 |
Dauphin and Lancaster |
Lebanon |
|
Lehigh |
6 Mar 1812 |
Northampton |
Allentown |
|
Luzerne |
25 Sep 1786 |
Northumberland |
Wilkes-Barre |
|
Lycoming |
13 Apr 1795 |
Northumberland |
Williamsport |
|
McKean |
26 Mar 1804 |
Lycoming |
Smethport |
|
Mercer |
12 Mar 1800 |
Allegheny and Crawford |
Mercer |
|
Mifflin |
19 Sep 1789 |
Cumberland and Northumberland |
Lewistown |
|
Monroe |
1 Apr 1836 |
Northampton and Pike |
Stroudsburg |
|
Montgomery |
10 Sep 1784 |
Philadelphia |
Norristown |
|
Montour |
3 May 1850 |
Columbia |
Danville |
|
Northampton |
11 Mar 1752 |
Bucks |
Easton |
|
Northumberland |
21 Mar 1772 |
Bedford, Berks, Cumberland, Lancaster, and Northampton |
Sunbury |
|
Perry |
22 Mar 1820 |
Cumberland |
New Bloomfield |
|
Philadelphia |
1682 |
Original County |
Philadelphia |
|
Pike |
26 Mar 1814 |
Wayne |
Milford |
|
Potter |
26 Mar 1804 |
Lycoming |
Coudersport |
|
Schuylkill |
1 Mar 1811 |
Berks and Northampton |
Pottsville |
|
Snyder |
2 Mar 1855 |
Union |
Middleburg |
|
Somerset Notes |
17 Apr 1795 |
Bedford |
Somerset |
|
Sullivan |
15 Mar 1847 |
Lycoming |
Laporte |
|
Susquehanna |
21 Feb 1810 |
Luzerne |
Montrose |
|
Tioga |
26 Mar 1804 |
Lycoming |
Wellsboro |
|
Union |
22 Mar 1813 |
Northumberland |
Lewisburg |
|
Venango |
12 Mar 1800 |
Allegheny, Crawford, and Lycoming |
Franklin |
|
Warren |
12 Mar 1800 |
Allegheny, Crawford, Lycoming, and Venango |
Warren |
|
Washington |
28 Mar 1781 |
Westmoreland |
Washington |
|
Wayne |
21 Mar 1798 |
Northampton |
Honesdale |
|
Westmoreland |
26 Feb 1773 |
Bedford |
Greensburg |
|
Wyoming |
4 Apr 1842 |
Luzerne |
Tunkhannock |
|
York |
19 Aug 1749 |
Lancaster |
York |