Oak Brook is a village in DuPage County and Cook County, Illinois, United States. The population was 8,163 at the 2020 census. A suburb of Chicago, it contains the headquarters of Ace Hardware, Blistex, Federal Signal, CenterPoint Properties, Sanford L.P., TreeHouse Foods, and Lions Clubs International, and former headquarters of McDonald's and Ferrara Candy. Oak Brook was originally known as Fullersburg, named after Ben Fuller, an early settler. Oak Brook was incorporated as a village in 1958, due in large part to the efforts of Paul Butler, a prominent civic leader and landowner whose father had first moved to the vicinity in 1898 and opened a dairy farm shortly thereafter. Prior to incorporation, the name Oak Brook was used by local residents to distinguish their community from neighboring Hinsdale and Elmhurst, going back to the founding of the Oak Brook Civic Association almost two decades earlier. More information...
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