Rank County Population Density
1 Philadelphia County, Pennsylvania 11,379.5
2 Delaware County, Pennsylvania 3,040.5
3 Allegheny County, Pennsylvania 1,675.6
4 Montgomery County, Pennsylvania 1,655.9
5 Bucks County, Pennsylvania 1,034.7
6 Lehigh County, Pennsylvania 1,012.5
7 Northampton County, Pennsylvania 805.4
8 Chester County, Pennsylvania 664.7
9 Lancaster County, Pennsylvania 550.4
10 Dauphin County, Pennsylvania 510.6
11 York County, Pennsylvania 481.1
12 Berks County, Pennsylvania 480.4
13 Lackawanna County, Pennsylvania 467.1
14 Cumberland County, Pennsylvania 431.6
15 Beaver County, Pennsylvania 392.3
16 Lebanon County, Pennsylvania 369.1
17 Luzerne County, Pennsylvania 360.4
18 Westmoreland County, Pennsylvania 355.4
19 Erie County, Pennsylvania 351.1
20 Monroe County, Pennsylvania 279.2
21 Lawrence County, Pennsylvania 254.4
22 Washington County, Pennsylvania 242.5
23 Blair County, Pennsylvania 241.7
24 Butler County, Pennsylvania 233.1
25 Cambria County, Pennsylvania 208.7
26 Northumberland County, Pennsylvania 206.2
27 Adams County, Pennsylvania 195.5
28 Franklin County, Pennsylvania 193.7
29 Schuylkill County, Pennsylvania 190.4
30 Mercer County, Pennsylvania 173.4
31 Fayette County, Pennsylvania 172.8
32 Carbon County, Pennsylvania 171.1
33 Union County, Pennsylvania 142.2
34 Montour County, Pennsylvania 140.3
35 Columbia County, Pennsylvania 139.3
36 Centre County, Pennsylvania 138.7
37 Snyder County, Pennsylvania 120.8
38 Mifflin County, Pennsylvania 113.6
39 Indiana County, Pennsylvania 107.5
40 Armstrong County, Pennsylvania 105.5
41 Pike County, Pennsylvania 105.3
42 Lycoming County, Pennsylvania 94.5
43 Crawford County, Pennsylvania 87.7
44 Perry County, Pennsylvania 83.4
45 Venango County, Pennsylvania 81.5
46 Wayne County, Pennsylvania 72.8
47 Somerset County, Pennsylvania 72.4
48 Clearfield County, Pennsylvania 71.3
49 Wyoming County, Pennsylvania 71.2
50 Jefferson County, Pennsylvania 69.3
51 Greene County, Pennsylvania 67.2
52 Clarion County, Pennsylvania 66.6
53 Juniata County, Pennsylvania 63
54 Bradford County, Pennsylvania 54.6
55 Susquehanna County, Pennsylvania 52.7
56 Huntingdon County, Pennsylvania 52.5
57 Bedford County, Pennsylvania 49.2
58 Warren County, Pennsylvania 47.3
59 McKean County, Pennsylvania 44.4
60 Clinton County, Pennsylvania 44.2
61 Elk County, Pennsylvania 38.6
62 Tioga County, Pennsylvania 37
63 Fulton County, Pennsylvania 33.9
64 Forest County, Pennsylvania 18.1
65 Potter County, Pennsylvania 16.1
66 Sullivan County, Pennsylvania 14.3
67 Cameron County, Pennsylvania 12.8

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