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About Collinsville

Collinsville is a city located mainly in Madison County and partially in St. Clair County, Illinois, United States. As of the 2020 census, the city had a population of 24,366. Collinsville is approximately 14 miles (23 km) east of St. Louis, Missouri, and is part of that city's Metro East area.Collinsville is the location of Cahokia Mounds State Historic Site, a National Historic Landmark and UNESCO World Heritage Site. This prehistoric urban complex is estimated to have had a population of thousands at its peak, long before European exploration in the area. The city is also known for the Brooks Catsup Bottle Water Tower, the world's largest ketchup bottle, and is billed as the world's horseradish capital. == History == Cahokia, the largest Pre-Columbian settlement north of Mexico, was developed by the Mississippian culture and is located in what is now the westernmost part of Collinsville. At its peak about 1200 CE, Cahokia had a population of 20,000-30,000, more than any city in the present-day United States until after 1800. It includes Monks Mound, the largest prehistoric earthwork in the Americas, and more than 70 surviving smaller mounds.