Oak Brook is a village in DuPage County in Illinois. The population was 7,883 at the 2010 census. A suburb of Chicago, it is home to the headquarters of several notable companies and organizations including McDonald’s, Ace Hardware, Blistex, Federal Signal, CenterPoint Properties, Sanford L.P., Tree house Foods, and Lions Clubs International. As of the census of 2010, there were 7,883 people, 2,939 households, and 2,363 families residing in the village. The population density was 991.6 people per square mile. There were 3,188 housing units, at an average density of 401.0 per square mile.
There were 2,939 households, out of which 24.2% had children under the age of 18 living with them, 73.6% were headed by married couples living together, 4.7% had a female householder with no husband present, and 19.6% were non-families. 18.2% of all households were made up of individuals, and 12.7% were someone living alone who was 65 years of age or older. The average household size was 2.63, and the average family size was 2.99.
In the village the population was spread out with 17.8% under the age of 18, 5.7% from 18 to 24, 13.8% from 25 to 44, 33.6% from 45 to 64, and 29.3% who were 65 years of age or older. The median age was 54.5 years. For every 100 females there were 92.0 males. For every 100 females age 18 and over, there were 88.8 males.
For the period 2007-11, the estimated median annual income for a household in the village was $132,389, and the median income for a family was $152,209. Male full-time workers had a median income of $104,981 versus $71,961 for females. The per capita income for the village was $79,711. About 1.1% of families and 1.7% of the population were below the poverty line, including 1.7% of those under age 18 and 2.6% of those age 65 or over.
In 2011, 23.2% of Oak Brook’s residents were Asian, making it the Chicago suburb with the second highest percentage of Asians.