Edwardsville is a city in and the county seat of Madison County, Illinois, United States. As of the 2020 census, the population was 26,808. Th…Edwardsville is a city in and the county seat of Madison County, Illinois, United States. As of the 2020 census, the population was 26,808. The city was named in honor of Ninian Edwards, former Governor of the Illinois Territory. Edwardsville is a part of Southern Illinois and the Metro East region within Greater St. Louis, located 18 miles northeast of downtown St. Louis.
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