Clinton is the largest city and the county seat in DeWitt County, Illinois, United States. The population was 7,004 at the 2020 census. The cit…Clinton is the largest city and the county seat in DeWitt County, Illinois, United States. The population was 7,004 at the 2020 census. The city and the county are named for DeWitt Clinton, governor of New York, 1817–1823. Clinton Nuclear Generating Station is located six miles away on Clinton Lake.
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