Sangamon Township is a township in Piatt County, Illinois, USA. As of the 2010 census, its population was 2,357 and it contained 929 housing units.
According to the 2010 census, the township has a total area of , of which (or 99.85%) is land and (or 0.13%) is water. Lakes in this township include Buck Pond (historical). The stream of Madden Creek runs through this township.
The township contains nine cemeteries: Argo, Boyer, Bucks Pond, Camp Creek, Hughes, Ingram, Mackey, Madden and Mallory.