Calumet City, Illinois, United States [City]; population was 37,840 in 1990; housing units was 16,587 in 1990; location is 41°37'N 87°33'W; land area is 7.27 square miles (4,652 acres); water area is 0.12 square miles (75 acres); FIPS code is 10487 [SourceCBP]