67 Counties — pennsylvania
| County | Type | Population | Land area |
|---|
| adams | County | 91,292 | 520 sq mi |
| allegheny | County | 1,281,666 | 730 sq mi |
| armstrong | County | 72,392 | 654 sq mi |
| beaver | County | 181,412 | 435 sq mi |
| bedford | County | 49,984 | 1,015 sq mi |
| berks | County | 373,638 | 859 sq mi |
| blair | County | 129,144 | 526 sq mi |
| bradford | County | 62,761 | 1,151 sq mi |
| bucks | County | 597,635 | 608 sq mi |
| butler | County | 174,083 | 789 sq mi |
| cambria | County | 152,598 | 688 sq mi |
| cameron | County | 5,974 | 397 sq mi |
| carbon | County | 58,802 | 383 sq mi |
| centre | County | 135,758 | 1,108 sq mi |
| chester | County | 433,501 | 756 sq mi |
| clarion | County | 41,765 | 603 sq mi |
| clearfield | County | 83,382 | 1,147 sq mi |
| clinton | County | 37,914 | 891 sq mi |
| columbia | County | 64,151 | 486 sq mi |
| crawford | County | 90,366 | 1,013 sq mi |
| cumberland | County | 213,674 | 550 sq mi |
| dauphin | County | 251,798 | 525 sq mi |
| delaware | County | 550,864 | 184 sq mi |
| elk | County | 35,112 | 829 sq mi |
| erie | County | 280,843 | 802 sq mi |
| fayette | County | 148,644 | 790 sq mi |
| forest | County | 4,946 | 428 sq mi |
| franklin | County | 129,313 | 772 sq mi |
| fulton | County | 14,261 | 438 sq mi |
| greene | County | 40,672 | 576 sq mi |
| huntingdon | County | 45,586 | 875 sq mi |
| indiana | County | 89,605 | 830 sq mi |
| jefferson | County | 45,932 | 656 sq mi |
| juniata | County | 22,821 | 392 sq mi |
| lackawanna | County | 213,295 | 459 sq mi |
| lancaster | County | 470,658 | 949 sq mi |
| lawrence | County | 94,643 | 361 sq mi |
| lebanon | County | 120,327 | 362 sq mi |
| lehigh | County | 312,090 | 347 sq mi |
| luzerne | County | 319,250 | 891 sq mi |
| lycoming | County | 120,044 | 1,235 sq mi |
| mckean | County | 45,936 | 982 sq mi |
| mercer | County | 120,293 | 672 sq mi |
| mifflin | County | 46,486 | 411 sq mi |
| monroe | County | 138,687 | 607 sq mi |
| montgomery | County | 750,097 | 483 sq mi |
| montour | County | 18,236 | 131 sq mi |
| northampton | County | 267,066 | 374 sq mi |
| northumberland | County | 94,556 | 460 sq mi |
| perry | County | 43,602 | 554 sq mi |
| philadelphia | County | 1,517,550 | 135 sq mi |
| pike | County | 46,302 | 547 sq mi |
| potter | County | 18,080 | 1,081 sq mi |
| schuylkill | County | 150,336 | 779 sq mi |
| snyder | County | 37,546 | 331 sq mi |
| somerset | County | 80,023 | 1,075 sq mi |
| sullivan | County | 6,556 | 450 sq mi |
| susquehanna | County | 42,238 | 823 sq mi |
| tioga | County | 41,373 | 1,134 sq mi |
| union | County | 41,624 | 317 sq mi |
| venango | County | 57,565 | 675 sq mi |
| warren | County | 43,863 | 884 sq mi |
| washington | County | 202,897 | 857 sq mi |
| wayne | County | 47,722 | 729 sq mi |
| westmoreland | County | 369,993 | 1,023 sq mi |
| wyoming | County | 28,080 | 397 sq mi |
| york | County | 381,751 | 905 sq mi |