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Formation of Pennsylvania Counties


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Formation of Current Pennsylvania Counties
From:  PA GenWeb Site

 

 

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