is a city in Cook County, Illinois, United States. It is a suburb of Chicago. The population was 17,665 at the 2000 census. It is the home of Moraine Valley Community College as well as Amos Alonzo Stagg High School.
According to the United States Census Bureau, the city has a total area of 4.2 square miles (11.0 km²), of which, 4.2 square miles (10.8 km²) of it is land and 0.1 square miles (0.2 km²) of it (1.65%) is water.