Des Plaines (dĕs plānz) [key], city (1990 pop. 53,223), Cook co., NE Ill., a suburb of Chicago on the Des Plaines River; inc. 1925. Among its manufactures are chemicals and electronic equipment. It was founded in the 1830s as the town of Rand; the name was changed in 1869, and Riverview was annexed in 1925. O'Hare International Airport is to the south.
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