The Twenty Townships are an area in central New York than now is largely a part of Madison and Chenango counties. The area was also known as Clinton's Purchase.
On September 22, 1788 at Fort Schuyler, a treaty between Governor George Clinton and the Oneida Indians ceded this land from the tribe to the state of New York.
The southern part of the Twenty Townships became a part of Chenango County and the northern part was included in Madison County when it was created from Chenango County in 1806.
The names of the northern townships that became a part of Madison County, New York were:
In 1829, the names of the southern townships that became a part of Chenango County, New York were:
Township 20 became the Town of Sangerfield and the western part of Bridgewater in Oneida County.