 Société Athlétique de la Villa Primrose in Bordeaux (1909) were the venues of Chicago Marathon . 5 September 1971 is when Chicago Marathon was founded  . It was held in 1 August . 24 (from 5 confederations) were the number of teams who competed in Chicago Marathon . The no. of events in sport was 12 . 28 from 21 nations competed in Chicago Marathon . The official site of Chicago Marathon is www.hardrock100.com
Chicago Marathon will celebrate it's  Platinum jubilee on 2041