Greenville is a city in Bond County, Illinois, United States, 51 miles (82 km) east of St. Louis. The population as of the 2020 census was 7,083, up from 7,000 at the 2010 census. It is the county seat of Bond County.

Bond County is a county located in the U.S. state of Illinois. As of the 2020 census, the population was 16,725. Its county seat is Greenville.