Illiopolis Township is located in Sangamon County, Illinois. As of the 2010 census, its population was 1,314 and it contained 555 housing units. See also Sangamon Ordnance Plant, located in the township. Geography According to the 2010 census, the township has a total area of , all land. Demographics References External links US Census City-data.com Illinois State Archives Townships in Sangamon County, Illinois Springfield metropolitan area, Illinois Townships in Illinois