The venue for Chicago Marathon was Paris, XVIe,France . 28 from 28 nations were the competitors in Chicago Marathon . 2005 is when Chicago Marathon was founded  . The official site of Chicago Marathon is www.hardrock100.com . 16 (from 6 confederations) were the number of teams who competed in Chicago Marathon . The no. of events in sport was 18 . April 23–29 was when it was held
Information about Chicago Marathon could be found at www.hardrock100.com