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Wikipedia says:
Oak Park, Illinois is a suburb bordering the west side of Chicago in Cook County, Illinois, United States. Oak Park has easy access to downtown Chicago (the Chicago Loop) thanks to public transportation such as the Chicago 'L', CTA buses, and Metra commuter rail. As of the 2000 census, the area had a total population of 52,524. A census estimate for 2003 showed that the population had dipped to 50,824. (...) more....
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