Illiopolis is a village in Sangamon County, Illinois, United States. The population was 891 at the 2010 census. It is part of the Springfield, Illinois Metropolitan Statistical Area.
The ruins of the Sangamon Ordnance Plant, closed following World War II, lie west of Illiopolis.
The Formosa Plastics plant near Illiopolis, (only a skeleton crew of maintenance personnel and security workers remain as of May 2009)
Sangamon County, Illinois
Sangamon County is a county located in the center of the U.S. state of Illinois. According to the 2020 census, it had a population of 196,343. Its county seat and largest city is Springfield, the state capital.
Sangamon County Courthouse in 2017
Lincoln Tomb