List of Counties in Pennsylvania

Alphabetical List

County	FIPS code	County seat	Established	Origin	Etymology	Population	Area
Adams County	001	Gettysburg	1800	Parts of York County.	John Adams,second U.S. President	7005101407000000000101,407	7002522000000000000522 sq mi (70031352000000000001,352 km2)
Allegheny County	003	Pittsburgh	1788	Parts of Washington and Westmoreland Counties.	Lenape word for the Allegheny River, which possibly translates to "beautiful river"	70061223348000000001,223,348	7002745000000000000745 sq mi (70031930000000000001,930 km2)
Armstrong County	005	Kittanning	1800	Parts of Allegheny, Lycoming, and Westmoreland Counties.	John Armstrong, Revolutionary War general	700468941000000000068,941	7002664000000000000664 sq mi (70031720000000000001,720 km2)
Beaver County	007	Beaver	1800	Parts of Allegheny and Washington Counties.	Beaver River, itself named for the eponymous animal that was sighted along its banks	7005170539000000000170,539	7002444000000000000444 sq mi (70031150000000000001,150 km2)
Bedford County	009	Bedford	1771	Parts of Cumberland County.	Fort Bedford, which is named for John Russell, 4th Duke of Bedford	700449762000000000049,762	70031015000000000001,015 sq mi (70032629000000000002,629 km2)
Berks County	011	Reading	1752	Parts of Chester, Lancaster and Philadelphia Counties.	The English county of Berkshire	7005411442000000000411,442	7002866000000000000866 sq mi (70032243000000000002,243 km2)
Blair County	013	Hollidaysburg	1846	Parts of Huntingdon and Bedford Counties.	John Blair, Pennsylvania state legislator	7005127089000000000127,089	7002527000000000000527 sq mi (70031365000000000001,365 km2)
Bradford County	015	Towanda	1810	Parts of Luzerne and Lycoming Counties; originally called Ontario County, renamed as Bradford County in 1812.	William Bradford, second U.S. Attorney General	700462622000000000062,622	70031161000000000001,161 sq mi (70033007000000000003,007 km2)
Bucks County	017	Doylestown	1682	One of the original counties at the formation of Pennsylvania	The English county of Buckinghamshire	7005625249000000000625,249	7002622000000000000622 sq mi (70031611000000000001,611 km2)
Butler County	019	Butler	1800	Parts of Allegheny County.	Richard Butler, Revolutionary War general	7005183862000000000183,862	7002795000000000000795 sq mi (70032059000000000002,059 km2)
Cambria County	021	Ebensburg	1804	Parts of Somerset and Huntingdon Counties.	Cambria, the traditional name for Wales	7005143679000000000143,679	7002693000000000000693 sq mi (70031795000000000001,795 km2)
Cameron County	023	Emporium	1860	Parts of Clinton, Elk, McKean, and Potter Counties.	Simon Cameron, U.S. Senator from Pennsylvania	70035085000000000005,085	7002399000000000000399 sq mi (70031033000000000001,033 km2)
Carbon County	025	Jim Thorpe	1843	Parts of Monroe and Northampton Counties.	Carbon, the element found in coal	700465249000000000065,249	7002387000000000000387 sq mi (70031002000000000001,002 km2)
Centre County	027	Bellefonte	1800	Parts of Lycoming, Mifflin, Northumberland, and Huntingdon Counties.	Centre Furnance, the first industrial facility in the area	7005153990000000000153,990	70031112000000000001,112 sq mi (70032880000000000002,880 km2)
Chester County	029	West Chester	1682	One of the original counties at the formation of Pennsylvania.	The English city of Chester in the county of Cheshire	7005498886000000000498,886	7002760000000000000760 sq mi (70031968000000000001,968 km2)
Clarion County	031	Clarion	1839	Parts of Venango and Armstrong Counties.	Clarion River, itself so named for its clarity	700439988000000000039,988	7002609000000000000609 sq mi (70031577000000000001,577 km2)
Clearfield County	033	Clearfield	1804	Parts of Lycoming and Huntingdon Counties; Clearfield functioned as a part of Centre County for judiciary purposes until 1822.	The cleared fields from logging in the area	700481642000000000081,642	70031154000000000001,154 sq mi (70032989000000000002,989 km2)
Clinton County	035	Lock Haven	1839	Parts of Lycoming and Centre Counties.	DeWitt Clinton, New York Governor and prominent statesman	700439238000000000039,238	7002898000000000000898 sq mi (70032326000000000002,326 km2)
Columbia County	037	Bloomsburg	1813	Parts of Northumberland and Luzerne Counties.	Columbia, the first popular and poetic name for the United States	700467295000000000067,295	7002490000000000000490 sq mi (70031269000000000001,269 km2)
Crawford County	039	Meadville	1800	Parts of Allegheny County.	William Crawford, surveyor who helped to open trans-Appalachian lands to settlement	700488765000000000088,765	70031038000000000001,038 sq mi (70032688000000000002,688 km2)
Cumberland County	041	Carlisle	1750	Parts of Lancaster County.	The historic English county of Cumberland	7005235406000000000235,406	7002551000000000000551 sq mi (70031427000000000001,427 km2)
Dauphin County	043	Harrisburg	1785	Parts of Lancaster County.	Louis-Joseph, Dauphin of France	7005268100000000000268,100	7002558000000000000558 sq mi (70031445000000000001,445 km2)
Delaware County	045	Media	1789	Parts of Chester County.	Delaware River, itself named for the Delaware tribe	7005558979000000000558,979	7002191000000000000191 sq mi (7002495000000000000495 km2)
Elk County	047	Ridgway	1843	Parts of Jefferson, McKean, and Clearfield Counties.	Elk, which inhabit the forested county	700431946000000000031,946	7002832000000000000832 sq mi (70032155000000000002,155 km2)
Erie County	049	Erie	1800	Parts of Allegheny County; attached to Crawford County until 1803.	Lake Erie	7005280566000000000280,566	70031558000000000001,558 sq mi (70034035000000000004,035 km2)
Fayette County	051	Uniontown	1783	Parts of Westmoreland County.	The Marquis de Lafayette, French-born Revolutionary War general	7005136606000000000136,606	7002798000000000000798 sq mi (70032067000000000002,067 km2)
Forest County	053	Tionesta	1848	Parts of Jefferson County; attached to Jefferson County until 1857.	Chief natural feature	70037716000000000007,716	7002431000000000000431 sq mi (70031116000000000001,116 km2)
Franklin County	055	Chambersburg	1784	Parts of Cumberland County.	Benjamin Franklin, key founding father of the United States	7005149618000000000149,618	7002771000000000000771 sq mi (70031997000000000001,997 km2)
Fulton County	057	McConnellsburg	1850	Parts of Bedford County.	Robert Fulton, inventor of the steamboat	700414845000000000014,845	7002438000000000000438 sq mi (70031134000000000001,134 km2)
Greene County	059	Waynesburg	1796	Parts of Washington County.	Nathanael Greene, Revolutionary War general	700438686000000000038,686	7002578000000000000578 sq mi (70031497000000000001,497 km2)
Huntingdon County	061	Huntingdon	1787	Parts of Bedford County.	The historic English county of Huntingdonshire	700445913000000000045,913	7002889000000000000889 sq mi (70032302000000000002,302 km2)
Indiana County	063	Indiana	1803	Parts of Lycoming and Westmoreland Counties; it was attached to Westmoreland County until 1806.	Native Americans	700488880000000000088,880	7002834000000000000834 sq mi (70032160000000000002,160 km2)
Jefferson County	065	Brookville	1804	Parts of Lycoming County. Attached to Westmoreland County until 1806 and to Indiana County until 1830.	Thomas Jefferson, third U.S. President	700445200000000000045,200	7002657000000000000657 sq mi (70031702000000000001,702 km2)
Juniata County	067	Mifflintown	1831	Parts of Mifflin County.	Juniata River, itself named for the Iroquoian word Onayutta, meaning "Standing Stone"	700424636000000000024,636	7002394000000000000394 sq mi (70031020000000000001,020 km2)
Lackawanna County	069	Scranton	1878	Parts of Luzerne County.	Lackawanna River, itself named for the Lenape word meaning "stream that forks"	7005214437000000000214,437	7002465000000000000465 sq mi (70031204000000000001,204 km2)
Lancaster County	071	Lancaster	1729	Parts of Chester County.	The English city of Lancaster	7005519445000000000519,445	7002984000000000000984 sq mi (70032549000000000002,549 km2)
Lawrence County	073	New Castle	1849	Parts of Beaver and Mercer Counties.	James Lawrence, War of 1812 captain	700491108000000000091,108	7002363000000000000363 sq mi (7002940000000000000940 km2)
Lebanon County	075	Lebanon	1813	Parts of Dauphin and Lancaster Counties.	Lebanon, the Biblical term for "White Mountain", which references the piety of the county's Moravian founders	7005133568000000000133,568	7002363000000000000363 sq mi (7002940000000000000940 km2)
Lehigh County	077	Allentown	1812	Parts of Northampton County.	Lehigh River	7005349497000000000349,497	7002349000000000000349 sq mi (7002904000000000000904 km2)
Luzerne County	079	Wilkes-Barre	1786	Parts of Northumberland County.	Anne-César, Chevalier de la Luzerne, French ambassador to the U.S. who aided republican causes	7005320918000000000320,918	7002907000000000000907 sq mi (70032349000000000002,349 km2)
Lycoming County	081	Williamsport	1795	Parts of Northumberland County.	Lycoming Creek, itself named for the Lenape word iacomic meaning "great steam"	7005116111000000000116,111	70031244000000000001,244 sq mi (70033222000000000003,222 km2)
McKean County	083	Smethport	1804	Parts 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.	Thomas McKean, second Governor of Pennsylvania	700443450000000000043,450	7002984000000000000984 sq mi (70032549000000000002,549 km2)
Mercer County	085	Mercer	1800	Parts of Allegheny County.	Hugh Mercer, Revolutionary War general	7005116638000000000116,638	7002683000000000000683 sq mi (70031769000000000001,769 km2)
Mifflin County	087	Lewistown	1789	Parts of Cumberland and Northumberland Counties.	Thomas Mifflin, first Governor of Pennsylvania	700446682000000000046,682	7002415000000000000415 sq mi (70031075000000000001,075 km2)
Monroe County	089	Stroudsburg	1836	Parts of Pike and Northampton Counties.	James Monroe, fifth U.S President	7005169842000000000169,842	7002617000000000000617 sq mi (70031598000000000001,598 km2)
Montgomery County	091	Norristown	1784	Parts of Philadelphia County.	The historic Welsh county of Montgomeryshire or Richard Montgomery, a general killed in the 1775 Battle of Quebec	7005799874000000000799,874	7002487000000000000487 sq mi (70031261000000000001,261 km2)
Montour County	093	Danville	1850	Parts of Columbia County.	Madame Montour, colonial ambassador to the Native Americans	700418267000000000018,267	7002132000000000000132 sq mi (7002342000000000000342 km2)
Northampton County	095	Easton	1752	Parts of Bucks County.	The English town of Northampton	7005297735000000000297,735	7002377000000000000377 sq mi (7002976000000000000976 km2)
Northumberland County	097	Sunbury	1772	Parts of Lancaster, Berks, Bedford, Cumberland, and Northampton Counties.	The English county of Northumberland	700494528000000000094,528	7002477000000000000477 sq mi (70031235000000000001,235 km2)
Perry County	099	Bloomfield	1820	Parts of Cumberland County.	Oliver Hazard Perry, War of 1812 commodore	700445969000000000045,969	7002556000000000000556 sq mi (70031440000000000001,440 km2)
Philadelphia County	101	Philadelphia	1682	One of the original counties at the formation of Pennsylvania.	"Brotherly love" from Greek philos ("love") and adelphos ("brother")	70061526006000000001,526,006	7002143000000000000143 sq mi (7002370000000000000370 km2)
Pike County	103	Milford	1814	Parts of Wayne County.	Zebulon Pike, explorer of the American West	700457369000000000057,369	7002567000000000000567 sq mi (70031469000000000001,469 km2)
Potter County	105	Coudersport	1804	From Lycoming county. Attached to Lycoming County until 1826 and to McKean County until 1835 for judicial purposes, Potter was not fully organized until 1835.	James Potter, Revolutionary War general	700417457000000000017,457	70031081000000000001,081 sq mi (70032800000000000002,800 km2)
Schuylkill County	107	Pottsville	1811	Parts of Berks and Northampton Counties.	Schuylkill River, itself a Dutch corruption of a Lenape word possibly meaning "hidden river"	7005148289000000000148,289	7002778000000000000778 sq mi (70032015000000000002,015 km2)
Snyder County	109	Middleburg	1855	Parts of Union County.	Simon Snyder, third Governor of Pennsylvania	700439702000000000039,702	7002332000000000000332 sq mi (7002860000000000000860 km2)
Somerset County	111	Somerset	1795	Parts of Bedford County.	The historic English county of Somerset	700477742000000000077,742	70031081000000000001,081 sq mi (70032800000000000002,800 km2)
Sullivan County	113	Laporte	1847	Parts of Lycoming County; attached to Lycoming until 1848.	John Sullivan, Revolutionary War general	70036428000000000006,428	7002452000000000000452 sq mi (70031171000000000001,171 km2)
Susquehanna County	115	Montrose	1810	Parts of Luzerne County ; attached to Luzerne County until 1812.	Susquehanna River, itself named after an Algonquin word for "muddy current"	700443356000000000043,356	7002832000000000000832 sq mi (70032155000000000002,155 km2)
Tioga County	117	Wellsboro	1804	Parts of Lycoming County; attached to Lycoming until 1812.	Tioga River, itself named for the Lenape word for "forks of the stream"	700441981000000000041,981	70031137000000000001,137 sq mi (70032945000000000002,945 km2)
Union County	119	Lewisburg	1813	Parts of Northumberland County.	The federal union of the states	700444947000000000044,947	7002317000000000000317 sq mi (7002821000000000000821 km2)
Venango County	121	Franklin	1800	Parts of Allegheny and Lycoming Counties; attached to until 1805.	A corruption of the Lenape word onenge, meaning "otter"	700454984000000000054,984	7002683000000000000683 sq mi (70031769000000000001,769 km2)
Warren County	123	Warren	1800	Parts of Allegheny and Lycoming counties; attached to Crawford County until 1805 and then to Venango until Warren was formally organized in 1819.	Joseph Warren, Revolutionary War general	700441815000000000041,815	7002898000000000000898 sq mi (70032326000000000002,326 km2)
Washington County	125	Washington	1781	Parts of Westmoreland County.	George Washington, first U.S. President	7005207820000000000207,820	7002861000000000000861 sq mi (70032230000000000002,230 km2)
Wayne County	127	Honesdale	1798	Parts of Northampton County.	Anthony Wayne, Revolutionary War general	700452822000000000052,822	7002751000000000000751 sq mi (70031945000000000001,945 km2)
Westmoreland County	129	Greensburg	1773	Parts of Bedford County.	The historic English county of Westmorland	7005365169000000000365,169	70031036000000000001,036 sq mi (70032683000000000002,683 km2)
Wyoming County	131	Tunkhannock	1842	Parts of Luzerne County.	The Delaware word xwéːwaməŋk, meaning "at the big river flat"	700428276000000000028,276	7002405000000000000405 sq mi (70031049000000000001,049 km2)
York County	133	York	1749	Parts of Lancaster County.	The English city of York	7005434972000000000434,972	7002910000000000000910 sq mi (70032357000000000002,357 km2)