Calumet City, city, Cook County, northeastern Illinois, between the Little Calumet and Grand Calumet rivers, near Lake Calumet; incorporated as a city 1925. It is a commercial and retail center; industries include the production of petroleum, chemical, and plastic products. The community, settled in 1868, developed as a suburb of Hammond, Indiana, and was incorporated as the city of West Hammond in 1893. In 1925, it adopted its present name, which is derived from the Native American Calumet peace pipe and is also the name of the two nearby rivers. Population 39,673 (1980); 37,840 (1990); 39,071 (2000).
