Cotton Hill Township is located in Sangamon County, Illinois. As of the 2010 census, its population was 902 and it contained 389 housing units. The township is the home of Hunter Lake, a proposed reservoir. Geography According to the 2010 census, the township has a total area of , of which (or 98.81%) is land and (or 1.19%) is water. Demographics References External links City-data.com Illinois State Archives Townships in Sangamon County, Illinois Springfield metropolitan area, Illinois Townships in Illinois