Adams County was formed 22 January 1800
TOWNSHIPS FORMATION CHART
| TOWNSHIP | DATE FORMED | SUBDIVIDED to TOWNSHIPs |
|---|---|---|
| BERWICK | 1747 while part of Lancaster County | Hamilton formed 1810; Oxford formed 1847 |
| BUTLER | 1849 from Franklin & Menallen Twps | none |
| CONEWAGO | 1801 from York County Heidelberg & Manheim Twps | part of Union twp formed 1841 |
| CUMBERLAND | 1749 while part of York County | part of Highland formed in 1863 |
| FRANKLIN | 1785 while part of York County | part of Buter Twp formed 1840 p/o Highland formed 1863 |
| FREEDOM | 1838 from Liberty Twp | none |
| GERMANY | 1749 while part of York County | part of Union twp formed 1841 |
| HAMILTON | 1810 from Berwick Twp | none |
| HAMILTONBAN | 1749 while part of York County | part of Highland formed 1863 |
| HIGHLAND | 1863 from Cumberland, Franklin & Hamiltonban Twp | none |
| HUNTINGDON | 1745 while part of Lancaster County | part of Latimore formed 1807 |
| LATIMORE | 1807 from York County Monaghan and Warrington Twps; and Huntingdon Twp | none |
| LIBERTY | 1801 from Hamiltonban | Freedom Twp formed 1838 |
| MENALLEN | 1745 as part of Lancaster County | part of Butler Twp formec 1840 |
| MT JOY | 1749 while part of York County | none |
| MT PLEASANT | 1749 while part of York County | part of Union twp formed 1841 |
| OXFORD | 1847 from Berwick Twp | none |
| READING | 1746 while part of Lancaster County | none |
| STRABAN | 1746 while part of Lancaster County | none |
| TYRONE | 1745 while part of Lancaster County | none |
| UNION | 1841 from Conewago, Germany, & Mt Pleasant Twps | none |