18 events were there in Chicago Marathon . 2005 is when Chicago Marathon was founded  . Paris, XVIe,France were the venues of Chicago Marathon . The official site of Chicago Marathon is www.hardrock100.com . 28 from 28 nations competed in Chicago Marathon . April 23–29 was when it was held . 16 (from 6 confederations) were the number of teams who competed in Chicago Marathon
More than 8 games were held in Chicago Marathon