Oak Brook is a village mostly in DuPage County with a small portion in Cook County in Illinois. Per the 2020 census, the population was 8,163. This suburb of Chicago has the headquarters of several companies and organizations including Ace Hardware, Blistex, Federal Signal, CenterPoint Properties, Sanford L.P., TreeHouse Foods, and Lions Clubs International. It is the former corporate home of McDonald's and Ferrara Candy.
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Coordinates 41°49'58.11" N -87°55'44.222" E
