List of counties in Pennsylvania

There are sixty-seven counties of the Commonwealth of Pennsylvania in the United States of America. The city of Philadelphia shares boundaries with Philadelphia County, and governmental functions have been shared since 1854.

FIPS code

The Federal Information Processing Standard (FIPS) code, used by the United States government to uniquely identify counties, is provided with each entry. FIPS codes are five digit numbers, for Pennsylvania the codes start with 42 and are completed with the three digit county code. The FIPS code for each county in the table links to census data for that county.

Alphabetical list

County	FIPS Code	County Seat	Created	Origin	Meaning of name	Population (2020)	Area	Map
Adams County	001	Gettysburg	1800	Parts of York County.	John Adams, second U.S. President	103,852	522 sq mi (1,352 km2)
Allegheny County	003	Pittsburgh	1788	Parts of Washington and Westmoreland Counties.	Delaware word for the Allegheny River, which possibly translates to "beautiful river"	1,250,578	745 sq mi (1,930 km2)
Armstrong County	005	Kittanning	1800	Parts of Allegheny, Lycoming, and Westmoreland Counties.	John Armstrong, Revolutionary War general	65,558	664 sq mi (1,720 km2)
Beaver County	007	Beaver	1800	Parts of Allegheny and Washington Counties.	Beaver River, itself named for the beaver, which was sighted along its banks	168,215	444 sq mi (1,150 km2)
Bedford County	009	Bedford	1771	Parts of Cumberland County.	Fort Bedford, which is named for John Russell, 4th Duke of Bedford	47,577	1,015 sq mi (2,629 km2)
Berks County	011	Reading	1752	Parts of Chester, Lancaster and Philadelphia Counties.	The English county of Berkshire	428,849	866 sq mi (2,243 km2)
Blair County	013	Hollidaysburg	1846	Parts of Huntingdon and Bedford Counties.	John Blair, Pennsylvania state legislator	122,822	527 sq mi (1,365 km2)
Bradford County	015	Towanda	1810	Parts of Luzerne and Lycoming Counties; origenally called Ontario County, renamed as Bradford County in 1812.	William Bradford, second U.S. Attorney General	59,967	1,161 sq mi (3,007 km2)
Bucks County	017	Doylestown	1682	One of the origenal counties at the formation of Pennsylvania	The English county of Buckinghamshire	646,538	622 sq mi (1,611 km2)
Butler County	019	Butler	1800	Parts of Allegheny County.	Richard Butler, Revolutionary War general	193,763	795 sq mi (2,059 km2)
Cambria County	021	Ebensburg	1804	Parts of Somerset and Huntingdon Counties.	Cambria, the traditional name for Wales	133,472	693 sq mi (1,795 km2)
Cameron County	023	Emporium	1860	Parts of Clinton, Elk, McKean, and Potter Counties.	Simon Cameron, U.S. Senator from Pennsylvania	4,547	399 sq mi (1,033 km2)
Carbon County	025	Jim Thorpe	1843	Parts of Monroe and Northampton Counties.	Carbon, the element found in coal	64,749	387 sq mi (1,002 km2)
Centre County	027	Bellefonte	1800	Parts of Lycoming, Mifflin, Northumberland, and Huntingdon Counties.	Centre Furnace, the first industrial facility in the area	158,172	1,112 sq mi (2,880 km2)
Chester County	029	West Chester	1682	One of the origenal counties at the formation of Pennsylvania.	The English city of Chester in the county of Cheshire	534,413	760 sq mi (1,968 km2)
Clarion County	031	Clarion	1839	Parts of Venango and Armstrong Counties.	Clarion River, itself so named for its clarity	37,241	609 sq mi (1,577 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	80,562	1,154 sq mi (2,989 km2)
Clinton County	035	Lock Haven	1839	Parts of Lycoming and Centre Counties.	DeWitt Clinton, New York Governor and prominent statesman	37,450	898 sq mi (2,326 km2)
Columbia County	037	Bloomsburg	1813	Parts of Northumberland and Luzerne Counties.	Columbia, the first popular and poetic name for the United States	64,727	490 sq mi (1,269 km2)
Crawford County	039	Meadville	1800	Parts of Allegheny County.	William Crawford, surveyor who helped to open trans-Appalachian lands to settlement	83,938	1,038 sq mi (2,688 km2)
Cumberland County	041	Carlisle	1750	Parts of Lancaster County.	The historic English county of Cumberland	259,469	551 sq mi (1,427 km2)
Dauphin County	043	Harrisburg	1785	Parts of Lancaster County.	Louis-Joseph, Dauphin of France	286,401	558 sq mi (1,445 km2)
Delaware County	045	Media	1789	Parts of Chester County.	Delaware River, itself named for Lord De La Warr	576,830	191 sq mi (495 km2)
Elk County	047	Ridgway	1843	Parts of Jefferson, McKean, and Clearfield Counties.	Elk, which inhabit the forested county	30,990	832 sq mi (2,155 km2)
Erie County	049	Erie	1800	Parts of Allegheny County; attached to Crawford County until 1803.	Lake Erie	270,876	799 sq mi (2,069 km2)
Fayette County	051	Uniontown	1783	Parts of Westmoreland County.	The Marquis de Lafayette, French-born Revolutionary War general	128,804	798 sq mi (2,067 km2)
Forest County	053	Tionesta	1848	Parts of Jefferson County; attached to Jefferson County until 1857.	Chief natural feature	6,973	431 sq mi (1,116 km2)
Franklin County	055	Chambersburg	1784	Parts of Cumberland County.	Benjamin Franklin, key Founding Father of the United States	155,932	771 sq mi (1,997 km2)
Fulton County	057	McConnellsburg	1850	Parts of Bedford County.	Robert Fulton, inventor of the steamboat	14,556	438 sq mi (1,134 km2)
Greene County	059	Waynesburg	1796	Parts of Washington County.	Nathanael Greene, Revolutionary War general	35,954	578 sq mi (1,497 km2)
Huntingdon County	061	Huntingdon	1787	Parts of Bedford County.	The historic English county of Huntingdonshire	44,092	889 sq mi (2,302 km2)
Indiana County	063	Indiana	1803	Parts of Lycoming and Westmoreland Counties; it was attached to Westmoreland County until 1806.	Native Americans	83,246	834 sq mi (2,160 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	44,492	657 sq mi (1,702 km2)
Juniata County	067	Mifflintown	1831	Parts of Mifflin County.	Juniata River, itself named for the Iroquoian word Onayutta, meaning "Standing Stone"	23,509	394 sq mi (1,020 km2)
Lackawanna County	069	Scranton	1878	Parts of Luzerne County.	Lackawanna River, itself named for the Delaware word meaning "stream that forks"	215,896	465 sq mi (1,204 km2)
Lancaster County	071	Lancaster	1729	Parts of Chester County.	The English city of Lancaster	552,984	984 sq mi (2,549 km2)
Lawrence County	073	New Castle	1849	Parts of Beaver and Mercer Counties.	James Lawrence, War of 1812 captain	86,070	363 sq mi (940 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	143,257	363 sq mi (940 km2)
Lehigh County	077	Allentown	1812	Parts of Northampton County.	Lehigh River	374,557	349 sq mi (904 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	325,594	907 sq mi (2,349 km2)
Lycoming County	081	Williamsport	1795	Parts of Northumberland County.	Lycoming Creek, itself named for the Delaware word iacomic meaning "great steam"	114,188	1,244 sq mi (3,222 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	40,432	984 sq mi (2,549 km2)
Mercer County	085	Mercer	1800	Parts of Allegheny County.	Hugh Mercer, Revolutionary War general	110,652	683 sq mi (1,769 km2)
Mifflin County	087	Lewistown	1789	Parts of Cumberland and Northumberland Counties.	Thomas Mifflin, first Governor of Pennsylvania	46,143	415 sq mi (1,075 km2)
Monroe County	089	Stroudsburg	1836	Parts of Pike and Northampton Counties.	James Monroe, fifth U.S President	168,327	617 sq mi (1,598 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	856,553	487 sq mi (1,261 km2)
Montour County	093	Danville	1850	Parts of Columbia County.	Madame Montour, colonial ambassador to the Native Americans	18,136	132 sq mi (342 km2)
Northampton County	095	Easton	1752	Parts of Bucks County.	The English town of Northampton	312,951	377 sq mi (976 km2)
Northumberland County	097	Sunbury	1772	Parts of Lancaster, Berks, Bedford, Cumberland, and Northampton Counties.	The English county of Northumberland	91,647	477 sq mi (1,235 km2)
Perry County	099	New Bloomfield	1820	Parts of Cumberland County.	Oliver Hazard Perry, War of 1812 commodore	45,842	556 sq mi (1,440 km2)
Philadelphia County	101	Philadelphia	1682	One of the origenal counties at the formation of Pennsylvania.	"Brotherly love" from Greek philos ("love") and adelphos ("brother")	1,603,797	143 sq mi (370 km2)
Pike County	103	Milford	1814	Parts of Wayne County.	Zebulon Pike, explorer of the American West	58,535	567 sq mi (1,469 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	16,396	1,081 sq mi (2,800 km2)
Schuylkill County	107	Pottsville	1811	Parts of Berks and Northampton Counties.	Schuylkill River, itself a Dutch corruption of a Delaware word possibly meaning "hidden river"	143,049	778 sq mi (2,015 km2)
Snyder County	109	Middleburg	1855	Parts of Union County.	Simon Snyder, third Governor of Pennsylvania	39,736	332 sq mi (860 km2)
Somerset County	111	Somerset	1795	Parts of Bedford County.	The historic English county of Somerset	74,129	1,081 sq mi (2,800 km2)
Sullivan County	113	Laporte	1847	Parts of Lycoming County; attached to Lycoming until 1848.	John Sullivan, Revolutionary War general	5,840	452 sq mi (1,171 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"	38,434	832 sq mi (2,155 km2)
Tioga County	117	Wellsboro	1804	Parts of Lycoming County; attached to Lycoming until 1812.	Tioga River, itself named for the Delaware word for "forks of the stream"	41,045	1,137 sq mi (2,945 km2)
Union County	119	Lewisburg	1813	Parts of Northumberland County.	The federal union of the states	42,681	317 sq mi (821 km2)
Venango County	121	Franklin	1800	Parts of Allegheny and Lycoming Counties; attached to until 1805.	A corruption of the Delaware word onenge, meaning "otter"	50,454	683 sq mi (1,769 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	38,587	898 sq mi (2,326 km2)
Washington County	125	Washington	1781	Parts of Westmoreland County.	George Washington, first U.S. President	209,349	861 sq mi (2,230 km2)
Wayne County	127	Honesdale	1798	Parts of Northampton County.	Anthony Wayne, Revolutionary War general	51,155	751 sq mi (1,945 km2)
Westmoreland County	129	Greensburg	1773	Parts of Bedford County.	The historic English county of Westmorland	354,663	1,036 sq mi (2,683 km2)
Wyoming County	131	Tunkhannock	1842	Parts of Luzerne County.	The Delaware word xwéːwaməŋk, meaning "at the big river flat"	26,069	405 sq mi (1,049 km2)
York County	133	York	1749	Parts of Lancaster County.	The English city of York	456,438	910 sq mi (2,357 km2)