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DuPage County, Illinois locator map According to the United States Census Bureau, Oak Brook is a Village that is located primarily in DuPage County, Illinois at 41.84 degrees North and 87.95 degrees West.  The village's time zone is America/Chicago, and the village's primary telephone area code is 630.  The land area of Oak Brook is about 7.96 square miles, whereas the water area of the village is about 0.33 square miles. 

The Census Bureau estimates that Oak Brook had about 8,016 residents in 2019, which is approximately 1,007 people per square mile of land area. 

According to recent American Community Survey data, the median household income in Oak Brook was about $141,055 per year. 

The Illinois counties map at upper right shows DuPage County, highlighted in red.  Use the menu below to display interactive maps of Oak Brook, either in a frame on this page or in full-screen mode. 

Use the menu below to display categorized Oak Brook directories. 

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