Benton is a city in and the county seat of Franklin County, Illinois. The population was 6,709 at the 2020 census. In 1839, Franklin County was split roughly in half and the county seat was permanently fixed "at a hill at the south end of Rowling's Prairie", the site of the future city of Benton. Benton's namesake is Missouri senator Thomas Hart Benton. The village of Benton was organized in 1841 on 20 acres (8.1 ha) of property donated by John Ewing and Walter S. Akin. In 1902, the village became a city, and incorporated under the mayor/commissioner form of government.