AREA AND POPULATION OF PENNSYLVANIA BY COUNTIES.
| County | Map Index. |
County Seat. | Area in square miles. |
Population. | |
| 1890. | 1900. | ||||
| Adams | D 4 | Gettysburg | 537 | 33,486 | 34,496 |
| Allegheny | A 3 | Pittsburg | 758 | 551,959 | 775,058 |
| Armstrong | B 3 | Kittanning | 640 | 47,747 | 52,551 |
| Beaver | A 3 | Beaver | 426 | 50,077 | 56,432 |
| Bedford | C 4 | Bedford | 1,070 | 38,644 | 39,468 |
| Berks | E 3 | Reading | 874 | 137,327 | 159,615 |
| Blair | C 3 | Hollidaysburg | 530 | 70,866 | 85,039 |
| Bradford | E 2 | Towanda | 1,140 | 59,233 | 59,403 |
| Bucks | F 3 | Doylestown | 620 | 70,615 | 71,190 |
| Butler | B 3 | Butler | 765 | 55,339 | 56,962 |
| Cambria | C 3 | Ebensburg | 680 | 66,375 | 104,837 |
| Cameron | C 2 | Emporium | 375 | 7,238 | 7,048 |
| Carbon | F 3 | Mauch Chunk | 400 | 38,624 | 44,510 |
| Center | D 3 | Bellefonte | 1,130 | 43,269 | 42,894 |
| Chester | F 4 | Westchester | 760 | 89,377 | 95,695 |
| Clarion | B 2 | Clarion | 566 | 36,802 | 34,283 |
| Clearfield | C 3 | Clearfield | 1,141 | 69,565 | 80,614 |
| Clinton | D 2 | Lockhaven | 892 | 28,685 | 29,197 |
| Columbia | E 2 | Bloomsburg | 480 | 36,832 | 39,896 |
| Crawford | A 2 | Meadville | 1,020 | 65,324 | 63,643 |
| Cumberland | D 3 | Carlisle | 536 | 47,271 | 50,344 |
| Dauphin | E 3 | Harrisburg | 514 | 96,977 | 114,443 |
| Delaware | F 3 | Media | 178 | 74,683 | 94,762 |
| Elk | C 2 | Ridgway | 760 | 22,239 | 32,903 |
| Erie | A 1 | Erie | 782 | 86,074 | 98,473 |
| Fayette | B 4 | Uniontown | 824 | 80,006 | 110,413 |
| Forest | B 2 | Tionesta | 420 | 8,482 | 11,039 |
| Franklin | D 4 | Chambersburg | 731 | 51,433 | 54,902 |
| Fulton | C 4 | McConnellsburg | 416 | 10,137 | 9,924 |
| Greene | A 4 | Waynesburg | 588 | 28,935 | 28,281 |
| Huntingdon | C 3 | Huntingdon | 940 | 35,751 | 34,650 |
| Indiana | B 3 | Indiana | 820 | 42,175 | 42,556 |
| Jefferson | B 3 | Brookville | 620 | 44,005 | 59,113 |
| Juniata | D 3 | Mifflintown | 398 | 16,655 | 16,054 |
| Lackawanna | F 2 | Scranton | 470 | 142,088 | 193,831 |
| Lancaster | E 3 | Lancaster | 960 | 149,095 | 159,241 |
| Lawrence | A 3 | Newcastle | 360 | 37,517 | 57,042 |
| Lebanon | E 3 | Lebanon | 370 | 48,131 | 53,827 |
| Lehigh | F 3 | Allentown | 328 | 76,631 | 93,893 |
| Luzerne | E 3 | Wilkesbarre | 910 | 201,203 | 257,121 |
| Lycoming | D 2 | Williamsport | 1,240 | 70,579 | 75,663 |
| McKean | C 2 | Smethport | 976 | 46,863 | 51,343 |
| Mercer | A 2 | Mercer | 680 | 55,744 | 57,387 |
| Mifflin | D 3 | Lewistown | 411 | 19,996 | 23,160 |
| Monroe | F 3 | Stroudsburg | 630 | 20,111 | 21,161 |
| Montgomery | F 3 | Norristown | 501 | 123,290 | 138,995 |
| Montour | E 3 | Danville | 142 | 15,645 | 15,526 |
| Northampton | F 3 | Easton | 370 | 84,220 | 99,687 |
| Northumberland | F 3 | Sunbury | 469 | 74,698 | 90,911 |
| Perry | D 3 | New Bloomfield | 561 | 26,276 | 26,263 |
| Philadelphia | F 4 | Philadelphia | 130 | 1,046,964 | 1,293,697 |
| Pike | F 2 | Milford | 620 | 9,412 | 8,766 |
| Potter | D 2 | Coudersport | 1,049 | 22,778 | 30,621 |
| Schuylkill | E 3 | Pottsville | 789 | 154,163 | 172,927 |
| Snyder | D 3 | Middleburg | 320 | 17,651 | 17,304 |
| Somerset | B 4 | Somerset | 1,040 | 37,317 | 49,461 |
| Sullivan | E 2 | Laporte | 470 | 11,620 | 12,134 |
| Susquehanna | E 2 | Montrose | 823 | 40,093 | 40,043 |
| Tioga | D 2 | Wellsboro | 1,180 | 52,313 | 49,086 |
| Union | D 3 | Lewisburg | 316 | 17,820 | 17,592 |
| Venango | B 2 | Franklin | 671 | 46,640 | 49,648 |
| Warren | B 2 | Warren | 860 | 37,585 | 38,946 |
| Washington | A 3 | Washington | 830 | 71,155 | 92,181 |
| Wayne | F 2 | Honesdale | 831 | 31,010 | 30,171 |
| Westmoreland | B 3 | Greensburg | 1,060 | 112,819 | 160,175 |
| Wyoming | E 2 | Tunkhannock | 409 | 15,891 | 17,152 |
| York | E 4 | York | 875 | 99,489 | 116,413 |
