Sullivan Township is located in Livingston County, Illinois. As of the 2010 census, its population was 724 and it contained 354 housing units. Sullivan Township formed from Saunemin Township in 1863. Geography According to the 2010 census, the township has a total area of , all land. The township contains the village of Cullom and the former communities of Griswold, Sullivan Center and Saxony. Demographics References External links US Census City-data.com Illinois State Archives Townships in Livingston County, Illinois Populated places established in 1863 Townships in Illinois 1863 establishments in Illinois