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is a city located mainly in Madison County, and partially in St. Clair County, both in Illinois. As of the 2000 census, the city had a population of 24,707. Collinsville is approximately 12 miles from St. Louis, Missouri and is considered part of that city's Metro-East area. Famously, it is the home of the world's largest ketchup bottle, a former water tower, and the world's horseradish capital .
Collinsville is located at (38.674398, -89.995402). According to the United States Census Bureau, the city has a total area of 13.6 square miles (35.2 km²), of which, 13.6 square miles (35.2 km²) of it is land and 0.07% is water. Collinsville is approximately 12 miles due east of Saint Louis, MO.