 According to the United States Census Bureau, the township has a total area of , all of it land.Brookfield Township is bordered by the Town of Troupsburg, Steuben County, New York to the north, Deerfield Township to the east, Westfield Township to the south and Harrison Township in Potter County to the west.As of the census of 2000, there were 443 people, 171 households, and 132 families residing in the township.