1830
| RANK | COUNTY | TOTAL POPULATION | RANK | COUNTY | TOTAL POPULATION | |
| 1 | Philadelphia County | 188,797 | 22 | Adams County | 21,379 | |
| 2 | Lancaster County | 76,631 | 5 | Allegheny County | 50,552 | |
| 3 | Berks County | 53,152 | 33 | Armstrong County | 17,701 | |
| 4 | Chester County | 50,910 | 19 | Beaver County | 24,183 | |
| 5 | Allegheny County | 50,552 | 18 | Bedford County | 24,502 | |
| 6 | Bucks County | 45,745 | 3 | Berks County | 53,152 | |
| 7 | York County | 42,859 | 27 | Bradford County | 19,746 | |
| 8 | Washington County | 42,784 | 6 | Bucks County | 45,745 | |
| 9 | Northampton County | 39,482 | 39 | Butler County | 14,581 | |
| 10 | Montgomery County | 39,406 | 45 | Cambria County | 7,076 | |
| 11 | Westmoreland County | 38,400 | 29 | Centre County | 18,879 | |
| 12 | Franklin County | 35,037 | 4 | Chester County | 50,910 | |
| 13 | Cumberland County | 29,226 | 47 | Clearfield County | 4,803 | |
| 14 | Fayette County | 29,172 | 26 | Columbia County | 20,059 | |
| 15 | Luzerne County | 27,379 | 38 | Crawford County | 16,030 | |
| 16 | Huntingdon County | 27,145 | 13 | Cumberland County | 29,226 | |
| 17 | Dauphin County | 25,243 | 17 | Dauphin County | 25,243 | |
| 18 | Bedford County | 24,502 | 35 | Delaware County | 17,323 | |
| 19 | Beaver County | 24,183 | 36 | Erie County | 17,041 | |
| 20 | Lehigh County | 22,256 | 14 | Fayette County | 29,172 | |
| 21 | Mifflin County | 21,690 | 12 | Franklin County | 35,037 | |
| 22 | Adams County | 21,379 | 31 | Greene County | 18,028 | |
| 23 | Union County | 20,795 | 16 | Huntingdon County | 27,145 | |
| 24 | Schuylkill County | 20,744 | 41 | Indiana County | 14,252 | |
| 25 | Lebanon County | 20,557 | 49 | Jefferson County | 2,025 | |
| 26 | Columbia County | 20,059 | 2 | Lancaster County | 76,631 | |
| 27 | Bradford County | 19,746 | 25 | Lebanon County | 20,557 | |
| 28 | Mercer County | 19,729 | 20 | Lehigh County | 22,256 | |
| 29 | Centre County | 18,879 | 15 | Luzerne County | 27,379 | |
| 30 | Northumberland County | 18,133 | 34 | Lycoming County | 17,636 | |
| 31 | Greene County | 18,028 | 50 | McKean County | 1,439 | |
| 32 | Somerset County | 17,762 | 28 | Mercer County | 19,729 | |
| 33 | Armstrong County | 17,701 | 21 | Mifflin County | 21,690 | |
| 34 | Lycoming County | 17,636 | 10 | Montgomery County | 39,406 | |
| 35 | Delaware County | 17,323 | 9 | Northampton County | 39,482 | |
| 36 | Erie County | 17,041 | 30 | Northumberland County | 18,133 | |
| 37 | Susquehanna County | 16,787 | 40 | Perry County | 14,261 | |
| 38 | Crawford County | 16,030 | 1 | Philadelphia County | 188,797 | |
| 39 | Butler County | 14,581 | 46 | Pike County | 4,843 | |
| 40 | Perry County | 14,261 | 51 | Potter County | 1,265 | |
| 41 | Indiana County | 14,252 | 24 | Schuylkill County | 20,744 | |
| 42 | Venango County | 9,470 | 32 | Somerset County | 17,762 | |
| 43 | Tioga County | 8,978 | 37 | Susquehanna County | 16,787 | |
| 44 | Wayne County | 7,663 | 43 | Tioga County | 8,978 | |
| 45 | Cambria County | 7,076 | 23 | Union County | 20,795 | |
| 46 | Pike County | 4,843 | 42 | Venango County | 9,470 | |
| 47 | Clearfield County | 4,803 | 48 | Warren County | 4,697 | |
| 48 | Warren County | 4,697 | 8 | Washington County | 42,784 | |
| 49 | Jefferson County | 2,025 | 44 | Wayne County | 7,663 | |
| 50 | McKean County |