| ERECTED | TOWNSHIPS | FORMED FROM |
| 1772 | Turbot | Northumberland County |
| 1772 | Wyoming | Northumberland County |
| 1772 | Augusta | Northumberland County |
| 1775 | Mahoning | Turbut |
| 1785 | Catawissa | Augusta |
| 1786 | Derry | Turbut |
| 1789 | Fishingcreek | Wyoming |
| 1797 | Briarcreek | Fishingcreek |
| 1797 | Mifflin | Catawissa |
| 1798 | Bloom | Briarcreek |
| 1799 | Greenwood | Fishingcreek |
| 1801 | Hemlock | Mahoning |
| 1813 | Sugarloaf | Fishingcreek |
| 1817 | Madison | Derry |
| 1818 | Mt. Pleasant | Greenwood, Bloom & Fishingcreek |
| 1832 | Roaringcreek | Catawissa |
| 1837 | Montour | Hemlock |
| 1838 | Jackson | Greenwood |
| 1840 | Orange | Fishingcreek, Mt. Pleasant & Bloom |
| 1843 | Franklin | Catawissa |
| 1844 | Maine | Mifflin & Catawissa |
| 1844 | Center | Bloom & Briarcreek |
| 1845 | Beaver | Mifflin & Maine |
| 1850 | Benton | Sugarloaf |
| 1853 | Pine | Madison |
| 1853 | Locust | Roaringcreek |
| 1853 | Scott | Bloom |
| 1855 | Conyngham | Locust |