Shelby County is a county located in the U.S. state of Illinois. According to the 2020 census, it had a population of 20,990. Its county seat is Shelbyville. Shelby County was established in 1827 out of Fayette County. It was named in honor of Isaac Shelby, governor of Kentucky and participant in the American Revolutionary War. According to the U.S. Census Bureau, the county has a total area of 768 square miles (1,990 km2), of which 759 square miles (1,970 km2) is land and 9.5 square miles (25 km2) (1.2%) is water. More information...
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