| Rank | County | People per sq. mile | % Correct |
|---|---|---|---|
| 1 | Philadelphia | 10,839.8 | 100%
|
| 2 | Delaware | 2,942.1 | 75%
|
| 3 | Montgomery | 1,661.3 | 75%
|
| 4 | Allegheny | 1,651.0 | 67%
|
| 5 | Lehigh | 1,018.1 | 67%
|
| 6 | Bucks | 1,007.0 | 58%
|
| 9 | Lancaster | 535.5 | 58%
|
| 7 | Northampton | 792.9 | 58%
|
| 12 | Berks | 477.1 | 50%
|
| 8 | Chester | 667.0 | 50%
|
| 10 | Dauphin | 483.6 | 50%
|
| 13 | Lackawanna | 460.4 | 50%
|
| 11 | York | 481.0 | 50%
|
| 15 | Beaver | 383.1 | 42%
|
| 14 | Cumberland | 435.1 | 42%
|
| 18 | Westmoreland | 350.0 | 42%
|
| 24 | Cambria | 203.0 | 33%
|
| 67 | Cameron | 12.4 | 33%
|
| 61 | Elk | 37.9 | 33%
|
| 29 | Erie | 179.8 | 33%
|
| 64 | Forest | 17.8 | 33%
|
| 16 | Lebanon | 372.9 | 33%
|
| 17 | Luzerne | 353.5 | 33%
|
| 19 | Monroe | 272.7 | 33%
|
| 65 | Potter | 16.1 | 33%
|
| 62 | Tioga | 37.3 | 33%
|
| 21 | Washington | 241.8 | 33%
|
| 27 | Adams | 194.7 | 25%
|
| 22 | Blair | 240.4 | 25%
|
| 23 | Butler | 232.8 | 25%
|
| 32 | Carbon | 167.5 | 25%
|
| 26 | Franklin | 196.1 | 25%
|
| 63 | Fulton | 33.7 | 25%
|
| 53 | Juniata | 63.0 | 25%
|
| 20 | Lawrence | 247.7 | 25%
|
| 60 | McKean | 43.7 | 25%
|
| 35 | Montour | 139.6 | 25%
|
| 25 | Northumberland | 197.5 | 25%
|
| 28 | Schuylkill | 188.0 | 25%
|
| 66 | Sullivan | 14.1 | 25%
|
| 57 | Bedford | 48.5 | 17%
|
| 54 | Bradford | 53.8 | 17%
|
| 34 | Centre | 140.4 | 17%
|
| 59 | Clinton | 44.2 | 17%
|
| 36 | Columbia | 136.9 | 17%
|
| 30 | Fayette | 169.6 | 17%
|
| 55 | Huntingdon | 51.7 | 17%
|
| 31 | Mercer | 169.6 | 17%
|
| 41 | Pike | 100.3 | 17%
|
| 37 | Snyder | 120.4 | 17%
|
| 46 | Somerset | 71.2 | 17%
|
| 56 | Susquehanna | 51.3 | 17%
|
| 33 | Union | 141.5 | 17%
|
| 58 | Warren | 45.9 | 17%
|
| 48 | Wyoming | 69.7 | 17%
|
| 40 | Armstrong | 103.0 | 8%
|
| 52 | Clarion | 64.7 | 8%
|
| 47 | Clearfield | 70.6 | 8%
|
| 43 | Crawford | 84.6 | 8%
|
| 51 | Greene | 66.0 | 8%
|
| 39 | Indiana | 105.8 | 8%
|
| 50 | Jefferson | 68.4 | 8%
|
| 42 | Lycoming | 93.8 | 8%
|
| 38 | Mifflin | 112.6 | 8%
|
| 44 | Perry | 82.4 | 8%
|
| 45 | Venango | 79.5 | 8%
|
| 49 | Wayne | 69.2 | 8%
|