|Cook County Illinois Cities/Towns - Alsip, Arlington Heights, Barrington Hills, Berwyn, Blue Island, Brookfield, Burbank, Cicero, Chicago (County Seat), Chicago Heights, Des Plaines, Dolton, Elgin, Elk Grove Village, Evanston, Franklin Park, Forest Park, Glenview, Glenwood, Harvey, Hillside, Hoffman Estates, Justice, Lansing, La Grange, La Grange Park, Lemont, Lynwood, Lyons, Markham, Maywood, Melrose Park, Mount Prospect, Niles, Norridge, Northbrook, Oak Forest, Oak Lawn, Oak Park, Orland Hills, Orland Park, Palatine, Palos Heights, Palos Hills, Palos Park, Park Forest, Park Ridge, Prospect Heights, Rolling Meadows, Sauk Village, Schaumburg, Skokie, South Holland, Streamwood, Tinley Park, Westchester, Wheeling, Wilmette, Winnetka, Worth
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Cook County is a county in the U.S. state of Illinois. According to the 2016 US Census estimates, the county has 5,203,499 residents.The county seat is Chicago.
Cook County was created on January 15, 1831. It was named after Daniel Cook, one of the earliest and youngest statesmen in Illinois history, who served as the second U.S. Representative from Illinois and the first Attorney General of the State of Illinois.