2005 is when Chicago Marathon was founded  . Paris, XVIe,France were the venues of Chicago Marathon . It was held in April 23–29 . 28 from 28 nations were the competitors in Chicago Marathon . The no. of events in sport was 18 . 16 (from 6 confederations) were the number of teams who competed in Chicago Marathon . The official site of Chicago Marathon is www.hardrock100.com
The sport Chicago Marathon has less than42 contenders  from less than 35 nations