County
|
FIPS Code
1 |
County seat
2 |
Established
2 |
Origin
|
Etymology
|
Population
2 |
Area
2 |
Map
|
| Adams County |
001 |
Gettysburg |
1800 |
Parts of York County. |
John Adams |
&0000000000091292.00000091,292 |
&0000000000000522.000000522 sq mi
(&0000000000001352.0000001,352 km²) |
 |
| Allegheny County |
003 |
Pittsburgh |
1788 |
Parts of Washington and Westmoreland Counties. |
Lenape word, of uncertain meaning, for the Allegheny River |
&0000000001281666.0000001,281,666 |
&0000000000000745.000000745 sq mi
(&0000000000001930.0000001,930 km²) |
 |
| Armstrong County |
005 |
Kittanning |
1800 |
Parts of Allegheny, Lycoming, and Westmoreland Counties. |
John Armstrong |
&0000000000072392.00000072,392 |
&0000000000000664.000000664 sq mi
(&0000000000001720.0000001,720 km²) |
 |
| Beaver County |
007 |
Beaver |
1800 |
Parts of Allegheny and Washington Counties. |
The Beaver River |
&0000000000181412.000000181,412 |
&0000000000000444.000000444 sq mi
(&0000000000001150.0000001,150 km²) |
 |
| Bedford County |
009 |
Bedford |
1771 |
Parts of Cumberland County. |
Fort Bedford, which is named for the Duke of Bedford |
&0000000000049984.00000049,984 |
&0000000000001015.0000001,015 sq mi
(&0000000000002629.0000002,629 km²) |
 |
| Berks County |
011 |
Reading |
1752 |
Parts of Chester, Lancaster and Philadelphia Counties. |
The English county of Berkshire |
&0000000000373638.000000373,638 |
&0000000000000866.000000866 sq mi
(&0000000000002243.0000002,243 km²) |
 |
| Blair County |
013 |
Hollidaysburg |
1846 |
Parts of Huntingdon and Bedford Counties. |
John Blair |
&0000000000129144.000000129,144 |
&0000000000000527.000000527 sq mi
(&0000000000001365.0000001,365 km²) |
 |
| Bradford County |
015 |
Towanda |
1810 |
Parts of Luzerne and Lycoming Counties; originally called Ontario County, renamed as Bradford County in 1812. |
William Bradford |
&0000000000062761.00000062,761 |
&0000000000001161.0000001,161 sq mi
(&0000000000003007.0000003,007 km²) |
 |
| Bucks County |
017 |
Doylestown |
1682 |
One of the original counties at the formation of Pennsylvania |
The English county of Buckinghamshire |
&0000000000597635.000000597,635 |
&0000000000000622.000000622 sq mi
(&0000000000001611.0000001,611 km²) |
 |
| Butler County |
019 |
Butler |
1800 |
Parts of Allegheny County. |
General Richard Butler |
&0000000000174083.000000174,083 |
&0000000000000795.000000795 sq mi
(&0000000000002059.0000002,059 km²) |
 |
| Cambria County |
021 |
Ebensburg |
1804 |
Parts of Somerset and Huntingdon Counties. |
Wales |
&0000000000152593.000000152,593 |
&0000000000000693.000000693 sq mi
(&0000000000001795.0000001,795 km²) |
 |
| Cameron County |
023 |
Emporium |
1860 |
Parts of Clinton, Elk, McKean, and Potter Counties. |
Simon Cameron |
&0000000000005974.0000005,974 |
&0000000000000399.000000399 sq mi
(&0000000000001033.0000001,033 km²) |
 |
| Carbon County |
025 |
Jim Thorpe |
1843 |
Parts of Monroe and Northampton Counties. |
Coal |
&0000000000058802.00000058,802 |
&0000000000000387.000000387 sq mi
(&0000000000001002.0000001,002 km²) |
 |
| Centre County |
027 |
Bellefonte |
1800 |
Parts of Lycoming, Mifflin, Northumberland, and Huntingdon Counties. |
Centre Furnance, owned by Samuel Miles and John Patton |
&0000000000135758.000000135,758 |
&0000000000001112.0000001,112 sq mi
(&0000000000002880.0000002,880 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 |
&0000000000433501.000000433,501 |
&0000000000000760.000000760 sq mi
(&0000000000001968.0000001,968 km²) |
 |
| Clarion County |
031 |
Clarion |
1839 |
Parts of Venango and Armstrong Counties. |
Clarion River |
&0000000000041765.00000041,765 |
&0000000000000609.000000609 sq mi
(&0000000000001577.0000001,577 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 |
&0000000000083382.00000083,382 |
&0000000000001154.0000001,154 sq mi
(&0000000000002989.0000002,989 km²) |
 |
| Clinton County |
035 |
Lock Haven |
1839 |
Parts of Lycoming and Centre Counties. |
DeWitt Clinton |
&0000000000037914.00000037,914 |
&0000000000000898.000000898 sq mi
(&0000000000002326.0000002,326 km²) |
 |
| Columbia County |
037 |
Bloomsburg |
1813 |
Parts of Northumberland and Luzerne Counties. |
Columbia, the first popular and poetic name for the United States |
&0000000000064151.00000064,151 |
&0000000000000490.000000490 sq mi
(&0000000000001269.0000001,269 km²) |
 |
| Crawford County |
039 |
Meadville |
1800 |
Parts of Allegheny County. |
William Crawford |
&0000000000090366.00000090,366 |
&0000000000001038.0000001,038 sq mi
(&0000000000002688.0000002,688 km²) |
 |
| Cumberland County |
041 |
Carlisle |
1750 |
Parts of Lancaster County. |
The historic English county of Cumberland |
&0000000000213674.000000213,674 |
&0000000000000551.000000551 sq mi
(&0000000000001427.0000001,427 km²) |
 |
| Dauphin County |
043 |
Harrisburg |
1785 |
Parts of Lancaster County. |
The Dauphin |
&0000000000251798.000000251,798 |
&0000000000000558.000000558 sq mi
(&0000000000001445.0000001,445 km²) |
 |
| Delaware County |
045 |
Media |
1789 |
Parts of Chester County. |
The Delaware River |
&0000000000550864.000000550,864 |
&0000000000000191.000000191 sq mi
(&0000000000000495.000000495 km²) |
 |
| Elk County |
047 |
Ridgway |
1843 |
Parts of Jefferson, McKean, and Clearfield Counties. |
Elk |
&0000000000035112.00000035,112 |
&0000000000000832.000000832 sq mi
(&0000000000002155.0000002,155 km²) |
 |
| Erie County |
049 |
Erie |
1800 |
Parts of Allegheny County; attached to Crawford County until 1803. |
Lake Erie |
&0000000000280843.000000280,843 |
&0000000000001558.0000001,558 sq mi
(&0000000000004035.0000004,035 km²) |
 |
| Fayette County |
051 |
Uniontown |
1783 |
Parts of Westmoreland County. |
The Marquis de Lafayette |
&0000000000148644.000000148,644 |
&0000000000000798.000000798 sq mi
(&0000000000002067.0000002,067 km²) |
 |
| Forest County |
053 |
Tionesta |
1848 |
Parts of Jefferson County; attached to Jefferson County until 1857. |
Chief natural feature |
&0000000000004946.0000004,946 |
&0000000000000431.000000431 sq mi
(&0000000000001116.0000001,116 km²) |
 |
| Franklin County |
055 |
Chambersburg |
1784 |
Parts of Cumberland County. |
Benjamin Franklin |
&0000000000129313.000000129,313 |
&0000000000000771.000000771 sq mi
(&0000000000001997.0000001,997 km²) |
 |
| Fulton County |
057 |
McConnellsburg |
1850 |
Parts of Bedford County. |
Robert Fulton |
&0000000000014261.00000014,261 |
&0000000000000438.000000438 sq mi
(&0000000000001134.0000001,134 km²) |
 |
| Greene County |
059 |
Waynesburg |
1796 |
Parts of Washington County. |
General Nathanael Greene |
&0000000000040672.00000040,672 |
&0000000000000578.000000578 sq mi
(&0000000000001497.0000001,497 km²) |
 |
| Huntingdon County |
061 |
Huntingdon |
1787 |
Parts of Bedford County. |
Possibly the historic English county of Huntingdonshire |
&0000000000045586.00000045,586 |
&0000000000000889.000000889 sq mi
(&0000000000002302.0000002,302 km²) |
 |
| Indiana County |
063 |
Indiana |
1803 |
Parts of Lycoming and Westmoreland Counties; it was attached to Westmoreland County until 1806. |
Native Americans |
&0000000000089605.00000089,605 |
&0000000000000834.000000834 sq mi
(&0000000000002160.0000002,160 km²) |
 |
| Jefferson County |
065 |
Brookville |
1804 |
Parts of Lycoming County. Attached to Westmoreland County until 1806 and to Indiana County until 1830. |
Thomas Jefferson |
&0000000000045932.00000045,932 |
&0000000000000657.000000657 sq mi
(&0000000000001702.0000001,702 km²) |
 |
| Juniata County |
067 |
Mifflintown |
1831 |
Parts of Mifflin County. |
The Juniata River |
&0000000000022821.00000022,821 |
&0000000000000394.000000394 sq mi
(&0000000000001020.0000001,020 km²) |
 |
| Lackawanna County |
069 |
Scranton |
1878 |
Parts of Luzerne County. |
The Lackawanna River |
&0000000000213295.000000213,295 |
&0000000000000465.000000465 sq mi
(&0000000000001204.0000001,204 km²) |
 |
| Lancaster County |
071 |
Lancaster |
1729 |
Parts of Chester County. |
The English city of Lancaster |
&0000000000470658.000000470,658 |
&0000000000000984.000000984 sq mi
(&0000000000002549.0000002,549 km²) |
 |
| Lawrence County |
073 |
New Castle |
1849 |
Parts of Beaver and Mercer Counties. |
The USS Lawrence |
&0000000000213295.000000213,295 |
&0000000000000363.000000363 sq mi
(&0000000000000940.000000940 km²) |
 |
| Lebanon County |
075 |
Lebanon |
1813 |
Parts of Dauphin and Lancaster Counties. |
? |
&0000000000120327.000000120,327 |
&0000000000000363.000000363 sq mi
(&0000000000000940.000000940 km²) |
 |
| Lehigh County |
077 |
Allentown |
1812 |
Parts of Northampton County. |
The Lehigh River |
&0000000000312090.000000312,090 |
&0000000000000349.000000349 sq mi
(&0000000000000904.000000904 km²) |
 |
| Luzerne County |
079 |
Wilkes-Barre |
1786 |
Parts of Northumberland County. |
The Chevalier de Luzerne |
&0000000000319250.000000319,250 |
&0000000000000907.000000907 sq mi
(&0000000000002349.0000002,349 km²) |
 |
| Lycoming County |
081 |
Williamsport |
1795 |
Parts of Northumberland County. |
Lycoming Creek |
&0000000000120044.000000120,044 |
&0000000000001244.0000001,244 sq mi
(&0000000000003222.0000003,222 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 |
&0000000000045936.00000045,936 |
&0000000000000984.000000984 sq mi
(&0000000000002549.0000002,549 km²) |
 |
| Mercer County |
085 |
Mercer |
1800 |
Parts of Allegheny County. |
Hugh Mercer |
&0000000000120293.000000120,293 |
&0000000000000683.000000683 sq mi
(&0000000000001769.0000001,769 km²) |
 |
| Mifflin County |
087 |
Lewistown |
1789 |
Parts of Cumberland and Northumberland Counties. |
Thomas Mifflin |
&0000000000046486.00000046,486 |
&0000000000000415.000000415 sq mi
(&0000000000001075.0000001,075 km²) |
 |
| Monroe County |
089 |
Stroudsburg |
1836 |
Parts of Pike and Northampton Counties. |
James Monroe |
&0000000000138687.000000138,687 |
&0000000000000617.000000617 sq mi
(&0000000000001598.0000001,598 km²) |
 |
| Montgomery County |
091 |
Norristown |
1784 |
Parts of Philadelphia County. |
Uncertain; possibly either Richard Montgomery or the historic Welsh county of Montgomeryshire |
&0000000000750097.000000750,097 |
&0000000000000487.000000487 sq mi
(&0000000000001261.0000001,261 km²) |
 |
| Montour County |
093 |
Danville |
1850 |
Parts of Columbia County. |
Madame Montour |
&0000000000018236.00000018,236 |
&0000000000000132.000000132 sq mi
(&0000000000000342.000000342 km²) |
 |
| Northampton County |
095 |
Easton |
1752 |
Parts of Bucks County. |
The English city of Northampton |
&0000000000267066.000000267,066 |
&0000000000000377.000000377 sq mi
(&0000000000000976.000000976 km²) |
 |
| Northumberland County |
097 |
Sunbury |
1772 |
Parts of Lancaster, Berks, Bedford, Cumberland, and Northampton Counties. |
The English county of Northumberland |
&0000000000094556.00000094,556 |
&0000000000000477.000000477 sq mi
(&0000000000001235.0000001,235 km²) |
 |
| Perry County |
099 |
New Bloomfield |
1820 |
Parts of Cumberland County. |
Oliver Hazard Perry |
&0000000000043602.00000043,602 |
&0000000000000556.000000556 sq mi
(&0000000000001440.0000001,440 km²) |
 |
| Philadelphia County |
101 |
Philadelphia |
1682 |
One of the original counties at the formation of Pennsylvania. The city and county of Philadelphia were combined in 1854 and city and county offices merged in 1952. |
"Brotherly love" from Greek philos ("love") and adelphos ("brother") |
&0000000001517550.0000001,517,550 |
&0000000000000143.000000143 sq mi
(&0000000000000370.000000370 km²) |
 |
| Pike County |
103 |
Milford |
1814 |
Parts of Wayne County. |
Zebulon Pike |
&0000000000046302.00000046,302 |
&0000000000000567.000000567 sq mi
(&0000000000001469.0000001,469 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 |
&0000000000018080.00000018,080 |
&0000000000001081.0000001,081 sq mi
(&0000000000002800.0000002,800 km²) |
 |
| Schuylkill County |
107 |
Pottsville |
1811 |
Parts of Berks and Northampton Counties. |
The Schuylkill River |
&0000000000150336.000000150,336 |
&0000000000000778.000000778 sq mi
(&0000000000002015.0000002,015 km²) |
 |
| Snyder County |
109 |
Middleburg |
1855 |
Parts of Union County. |
Simon Snyder |
&0000000000037546.00000037,546 |
&0000000000000332.000000332 sq mi
(&0000000000000860.000000860 km²) |
 |
| Somerset County |
111 |
Somerset |
1795 |
Parts of Bedford County. |
The English county of Somerset |
&0000000000080023.00000080,023 |
&0000000000001081.0000001,081 sq mi
(&0000000000002800.0000002,800 km²) |
 |
| Sullivan County |
113 |
Laporte |
1847 |
Parts of Lycoming County; attached to Lycoming until 1848. |
John Sullivan |
&0000000000006556.0000006,556 |
&0000000000000452.000000452 sq mi
(&0000000000001171.0000001,171 km²) |
 |
| Susquehanna County |
115 |
Montrose |
1810 |
Parts of Luzerne County ; attached to Luzerne County until 1812. |
The Susquehanna River |
&0000000000042238.00000042,238 |
&0000000000000832.000000832 sq mi
(&0000000000002155.0000002,155 km²) |
 |
| Tioga County |
117 |
Wellsboro |
1804 |
Parts of Lycoming County; attached to Lycoming until 1812. |
The Tioga River |
&0000000000041373.00000041,373 |
&0000000000001137.0000001,137 sq mi
(&0000000000002945.0000002,945 km²) |
 |
| Union County |
119 |
Lewisburg |
1813 |
Parts of Northumberland County. |
The Federal union of the United States |
&0000000000041624.00000041,624 |
&0000000000000317.000000317 sq mi
(&0000000000000821.000000821 km²) |
 |
| Venango County |
121 |
Franklin |
1800 |
Parts of Allegheny and Lycoming Counties; attached to until 1805. |
A corruption of the Native word "onange", meaning "otter" |
&0000000000057565.00000057,565 |
&0000000000000683.000000683 sq mi
(&0000000000001769.0000001,769 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. |
General Joseph Warren |
&0000000000043863.00000043,863 |
&0000000000000898.000000898 sq mi
(&0000000000002326.0000002,326 km²) |
 |
| Washington County |
125 |
Washington |
1781 |
Parts of Westmoreland County. |
George Washington |
&0000000000202897.000000202,897 |
&0000000000000861.000000861 sq mi
(&0000000000002230.0000002,230 km²) |
 |
| Wayne County |
127 |
Honesdale |
1798 |
Parts of Northampton County. |
Anthony Wayne |
&0000000000047722.00000047,722 |
&0000000000000751.000000751 sq mi
(&0000000000001945.0000001,945 km²) |
 |
| Westmoreland County |
129 |
Greensburg |
1773 |
Parts of Bedford County. |
Possibly the historic English county of Westmorland |
&0000000000369993.000000369,993 |
&0000000000001036.0000001,036 sq mi
(&0000000000002683.0000002,683 km²) |
 |
| Wyoming County |
131 |
Tunkhannock |
1842 |
Parts of Luzerne County. |
The Delaware word xwé:wamənk, meaning "at the big river flat" |
&0000000000028080.00000028,080 |
&0000000000000405.000000405 sq mi
(&0000000000001049.0000001,049 km²) |
 |
| York County |
133 |
York |
1749 |
Parts of Lancaster County. |
The English city of York |
&0000000000381751.000000381,751 |
&0000000000000910.000000910 sq mi
(&0000000000002357.0000002,357 km²) |
 |