 According to the United States Census Bureau, the township has a total area of , of which, of it is land and of it (0.10%) is water.Jackson Township is bordered by the Towns of Caton in Steuben County, New York and Southport in Chemung County, New York to the north, Wells Township in Bradford County to the east, Rutland Township to the south and Tioga and Lawrence Townships to the west.As of the census of 2000, there were 2,054 people, 777 households, and 599 families residing in the township.