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Oak Brook is located in DuPage County, Illinois. There are roughly 8,308 residents, living in 3,342 households. The average temperature for Oak Brook this time of the year is low of 58F and high of 81F. On average, Oak Brook gets about 4.06 inches of precipitation in June. Most residents are home owners (89%), have a post secondary degree (60%) and are married, no kids (48%).