12 teams competed in Chicago Marathon . 18 events were there in Chicago Marathon . 37 from 31 nations were the competitors in Chicago Marathon . The sport has the official site www.hardrock100.com . Chicago Marathon was established on 1891; 128 years ago (1891) . Tennis Club de Paris, at Auteuil (some of the years 1895–1908),Chicago, Illinois, United States,Arena Olímpica do Rio were the venues of Chicago Marathon . 19–20 August was when it was held
Chicago Marathon will celebrate it's  Quasquicentennial jubilee on 2029