Some of the cities, towns, and places in Randolph County are Baldwin, Blair, Bremen, Chester, Coulterville, Dozaville, Eden, Ellis Grove, Evansville, Fort de Chartres, Fort Gage, Grigg, Houston, Kaskaskia, Leanderville, Marigold, Menard, Modoc, New Palestine, Percy, Prairie, Prairie du Rocher, Preston, Red Bud, Reily Lake, Rockwood, Ruma, Schuline, Shiloh Hill, Sparta, Steeleville, Tilden, Walsh, Welge, Wine Hill
Randolph County is a county located in the U.S. state of Illinois. According to the 2020 census, it had a population of 30,163. Its county seat is Chester.Owing to its role in the state's history, the county motto is "Where Illinois Began." It contains the historically important village of Kaskaskia, Illinois's first capital.
The county is part of Southern Illinois in the southern portion of the state known locally as "Little Egypt", and includes fertile river flats, part of the American Bottom; it is near the Greater St. Louis area.