| County | Date
Formed | County Seat | Parent County | Coordinator |
| Adams | 1800 | Gettysburg | York | Adopt me... |
| Allegheny | 1788 | Pittsburgh | Washington & Westmoreland | Adopt Me.... |
| Armstrong | 1800 | Kittanning | Allegheny, Lycoming & Westmoreland | Adopt Me.... |
| Beaver | 1800 | Beaver | Allegheny & Washington | Adopt Me.... |
| Bedford | 1771 | Bedford | Cumberland | Adopt Me.... |
| Berks | 1752 | Reading | Chester, Lancaster & Philadelphia | Adopt Me.... |
| Blair | 1846 | Holidaysburg | Huntington & Bedford | Adopt Me.... |
| Bradford | 1810 | Towanda | Luzerne & Lycoming | Adopt Me.... |
| Bucks | 1682 | Doylestown | Original County | Adopt Me.... |
| Butler | 1800 | Butler | Allegheny | Adopt Me.... |
| Cambria | 1804 | Ebensburg | Somerset, Huntingdon & Bedford | Adopt Me.... |
| Carbon | 1843 | Jim Thorpe | Monroe & Northampton | Adopt Me.... |
| Cameron | 1860 | Emporium | Clinton, Elk, McKean & Potter | Adopt Me.... |
| Centre | 1800 | Bellefonte | Lycoming, Mifflin, Huntingdon & Northampton | Adopt Me.... |
| Chester | 1682 | Chester | Original County | Adopt Me.... |
| Clarion | 1839 | Clarion | Venango & Armstrong | Adopt Me.... |
| Clearfield | 1804 | Clearfield | Lycoming & Huntingdon | Adopt Me.... |
| Clinton | 1839 | Lock Haven | Lycoming & Centre | Adopt Me.... |
| Columbia | 1813 | Bloomsburg | Northumberland & Luzerne | Adopt Me.... |
| Crawford | 1800 | Meadville | Allegheny | Adopt Me.... |
| Cumberland | 1750 | Carlisle | Lancaster | Adopt Me.... |
| Dauphin | 1785 | Harrisburg | Lancaster | Adopt Me.... |
| Delaware | 1789 | Media | Chester | Adopt Me.... |
| Elk | 1843 | Ridgway | Jefferson, McKean & Clearfield | Adopt Me.... |
| Erie | 1800 | Erie | Allegheny | Adopt Me.... |
| Fayette | 1783 | Uniontown | Westmoreland | Adopt Me.... |
| Forest | 1848 | Tionesta | Jefferson & Venango | Adopt Me.... |
| Franklin | 1784 | Chambersburg | Cumberland | Adopt Me.... |
| Fulton | 1851 | McConnellsburg | Bedford | Adopt Me.... |
| Greene | 1796 | Waynesburg | Washington | Adopt Me.... |
| Huntingdon | 1787 | Huntingdon | Bedford | Adopt Me.... |
| Indiana | 1803 | Indiana | Lycoming & Westmoreland | Adopt Me.... |
| Jefferson | 1804 | Brookville | Lycoming | Adopt Me.... |
| Juniata | 1831 | Mifflintown | Mifflin | Adopt Me.... |
| Lackawanna | 1878 | Scranton | Luzerne | Adopt Me.... |
| Lancaster | 1729 | Lancaster | Chester | Adopt Me.... |
| Lawrence | 1849 | New Castle | Beaver & Mercer | Adopt Me.... |
| Lebanon | 1813 | Lebanon | Dauphin & Lancaster | Adopt Me.... |
| Lehigh | 1812 | Allentown | Northampton | Adopt Me.... |
| Luzerne | 1786 | Wilkes-Barre | Northumberland | Adopt Me.... |
| Lycoming | 1795 | Williamsport | Northumberland | Adopt Me.... |
| McKean | 1804 | Smethport | Lycoming | Adopt Me.... |
| Mercer | 1800 | Mercer | Allegheny | Adopt Me.... |
| Mifflin | 1789 | Lewistown | Cumberland & Northumberland | Adopt Me.... |
| Monroe | 1836 | Stroudsburg | Pike & Northampton | Adopt Me.... |
| Montour | 1850 | Danville | Columbia | Adopt Me.... |
| Montgomery | 1784 | Norristown | Philadelphia | Adopt Me.... |
| Northampton | 1752 | Easton | Bucks | Adopt Me.... |
| Northumberland | 1772 | Sunbury | Berks, Bedford, Cumberland, Lancaster & Northampton | Adopt Me.... |
| Perry | 1820 | Bloomfield | Cumberland | Adopt Me.... |
| Philadelphia | 1682 | Philadelphia | Original County | Adopt Me.... |
| Pike | 1814 | Milford | Wayne | Adopt Me.... |
| Potter | 1804 | Coudersport | Lycoming | Adopt Me.... |
| Schuylkill | 1811 | Pottsville | Berks & Northampton | Adopt Me.... |
| Snyder | 1855 | Middleburg | Union | Adopt Me.... |
| Somerset | 1795 | Somerset | Bedford | Adopt Me.... |
| Sullivan | 1847 | Laporte | Lycoming | Adopt Me.... |
| Susquehanna | 1810 | Montrose | Luzerne | Adopt Me.... |
| Tioga | 1804 | Wellsboro | Lycoming | Adopt Me.... |
| Union | 1813 | Lewisburg | Northumberland | Adopt Me.... |
| Venango | 1800 | Franklin | Allegheny & Lycoming | Adopt Me.... |
| Warren | 1800 | Warren | Allegheny & Lycoming | Adopt Me.... |
| Washington | 1781 | Washington | Westmoreland | Adopt Me.... |
| Wayne | 1798 | Honesdale | Northampton | Adopt Me.... |
| Westmoreland | 1773 | Greensburg | Bedford | Adopt Me.... |
| Wyoming | 1842 | Tunkhannock | Luzerne | Adopt Me.... |
| York | 1749 | York | Lancaster | Adopt Me.... |
