Des Plaines, Illinois, is located in Cook County and has a population of about 58,000. A suburb of Chicago, Des Plaines is located just north of O'Hare International Airport. It is situated on and is named after the Des Plaines River, which runs through the city just east of its downtown area.
Illinois is in the Midwestern region of the U.S. The Mississippi River, the Ohio River, and the Wabash River form parts of Illinois’ boundaries. The state’s capital city is Springfield, but the largest concentration of population is in its northeast. Chicago is the largest city and the largest metro area. There are about 12,812,500 people living in 57,915 square miles.