Oak Brook is a community located in the U.S. state of Illinois. It is within Cook County and the home to several notable companies such as Ace Hardware, Blistex, Federal Signal, CenterPoint Properties, Sanford L.P., TreeHouse Foods, and Lions Clubs International. It has a total area of 8.29 square miles at 41°50′24″N 87°57′11″W. Oak Brook was incorporated in 1958. As of the 2010 census data, it had a total population of 7,883. The population density was 1,013.44/sq mi. Estimated per capita income in 2016 was $91,094. It has Zip codes 60521-60523.