Chester, city, seat (1844) of Randolph county, southwestern Illinois, U.S. It lies on the Mississippi River (there bridged to Missouri) near the mouth of the Marys River, about 60 miles (100 km) southeast of St. Louis, Missouri. Founded in 1819 by an Ohio land company and named for Chester, England, it developed as a trading centre for an agricultural area yielding wheat, corn (maize), and soybeans. Agriculture is still important, and flour milling and food processing also contribute to the local economy. The Menard Correctional Center (the state’s second oldest prison and largest maximum-security prison) was established there in 1878 and is a major factor in the city’s economy. Two other state institutions, the Chester Mental Health Center and the Menard Psychiatric Center, are in the city. Evergreen Cemetery contains a memorial to Shadrach Bond, Illinois’s first governor. Several historic sites are to the northwest in nearby Kaskaskia. Chester is the birthplace of cartoonist Elzie Segar, who created the well-known comic strip Popeye; a statue there commemorates the character. Turkey Bluffs and Randolph County state fish and wildlife areas are nearby, and Shawnee National Forest is southeast. Inc. 1855. Pop. (2000) 5,185; (2010) 8,586.