Largest Counties in Pennsylvania

Rank County Population County Seat Established Area (km2) Density
1 Philadelphia County 1,525,995 Philadelphia 1682 370 4,124.31
2 Allegheny County 1,223,337 Pittsburgh 1788 1,930 633.85
3 Montgomery County 799,863 Norristown 1784 1,261 634.31
4 Bucks County 625,238 Doylestown 1682 1,611 388.11
5 Delaware County 558,968 Media 1789 495 1,129.23
6 Lancaster County 519,434 Lancaster 1729 2,549 203.78
7 Chester County 498,875 West Chester 1682 1,968 253.49
8 York County 434,961 York 1749 2,357 184.54
9 Berks County 411,431 Reading 1752 2,243 183.43
10 Westmoreland County 365,158 Greensburg 1773 2,683 136.1
11 Lehigh County 349,486 Allentown 1812 904 386.6
12 Luzerne County 320,907 Wilkes Barre 1786 2,349 136.61
13 Northampton County 297,724 Easton 1752 976 305.05
14 Erie County 280,555 Erie 1800 2,069 135.6
15 Dauphin County 268,089 Harrisburg 1785 1,445 185.53
16 Cumberland County 235,395 Carlisle 1750 1,427 164.96
17 Lackawanna County 214,426 Scranton 1878 1,204 178.09
18 Washington County 207,809 Washington 1781 2,230 93.19
19 Butler County 183,851 Butler 1800 2,059 89.29
20 Beaver County 170,528 Beaver 1800 1,150 148.29
21 Monroe County 169,831 Stroudsburg 1836 1,598 106.28
22 Centre County 153,979 Bellefonte 1800 2,880 53.46
23 Franklin County 149,607 Chambersburg 1784 1,997 74.92
24 Schuylkill County 148,278 Pottsville 1811 2,015 73.59
25 Cambria County 143,668 Ebensburg 1804 1,795 80.04
26 Fayette County 136,595 Uniontown 1783 2,067 66.08
27 Lebanon County 133,557 Lebanon 1813 940 142.08
28 Blair County 127,078 Hollidaysburg 1846 1,365 93.1
29 Mercer County 116,627 Mercer 1800 1,769 65.93
30 Lycoming County 116,100 Williamsport 1795 3,222 36.03
31 Adams County 101,396 Gettysburg 1800 1,352 75
32 Northumberland County 94,517 Sunbury 1772 1,235 76.53
33 Lawrence County 91,097 New Castle 1849 940 96.91
34 Indiana County 88,869 Indiana 1803 2,160 41.14
35 Crawford County 88,754 Meadville 1800 2,688 33.02
36 Clearfield County 81,631 Clearfield 1804 2,989 27.31
37 Somerset County 77,731 Somerset 1795 2,800 27.76
38 Armstrong County 68,930 Kittanning 1800 1,720 40.08
39 Columbia County 67,284 Bloomsburg 1813 1,269 53.02
40 Carbon County 65,238 Jim Thorpe 1843 1,002 65.11
41 Bradford County 62,611 Towanda 1810 3,007 20.82
42 Pike County 57,358 Milford 1814 1,469 39.05
43 Venango County 54,973 Franklin 1800 1,769 31.08
44 Wayne County 52,811 Honesdale 1798 1,945 27.15
45 Bedford County 49,751 Bedford 1771 2,629 18.92
46 Mifflin County 46,671 Lewistown 1789 1,075 43.41
47 Perry County 45,958 New Bloomfield 1820 1,440 31.92
48 Huntingdon County 45,902 Huntingdon Vy 1787 2,302 19.94
49 Jefferson County 45,189 Brookville 1804 1,702 26.55
50 Union County 44,936 Lewisburg 1813 821 54.73
51 McKean County 43,439 Smethport 1804 2,549 17.04
52 Susquehanna County 43,345 Montrose 1810 2,155 20.11
53 Tioga County 41,970 Wellsboro 1804 2,945 14.25
54 Warren County 41,804 Warren 1800 2,326 17.97
55 Clarion County 39,977 Clarion 1839 1,577 25.35
56 Snyder County 39,691 Middleburg 1855 860 46.15
57 Clinton County 39,227 Lock Haven 1839 2,326 16.86
58 Greene County 38,675 Waynesburg 1796 1,497 25.84
59 Elk County 31,935 Ridgway 1843 2,155 14.82
60 Wyoming County 28,265 Tunkhannock 1842 1,049 26.94
61 Juniata County 24,625 Mifflintown 1831 1,020 24.14
62 Montour County 18,256 Danville 1850 342 53.38
63 Potter County 17,446 Coudersport 1804 2,800 6.23
64 Fulton County 14,834 McConnellsburg 1850 1,134 13.08
65 Forest County 7,705 Tionesta 1848 1,116 6.9
66 Sullivan County 6,417 Laporte 1847 1,171 5.48
67 Cameron County 5,074 Emporium 1860 1,033 4.91

Largest Counties in Pennsylvania

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