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is a city in Madison County and partially in St. Clair County, Illinois, United States. The population was 4,545 at the 2000 census. It is home to Gateway International Raceway and the first Bulgarian Orthodox church in the United States.
According to the United States Census Bureau, the city has a total area of 7.3 square miles (18.9 km²), of which, 7.0 square miles (18.2 km²) of it is land and 0.3 square miles (0.7 km²) of it (3.71%) is water.