16 (from 6 confederations) were the number of teams who competed in Chicago Marathon . It was held in 28 July – 12 August 2012 . Chicago Marathon was established on 1881; 138 years ago (1881) . 8 events were there in Chicago Marathon . Fort Copacabana,241.5 km (150.1 mi) were the venues of Chicago Marathon . The sport has the official site www.hardrock100.com
Chicago Marathon event has celebrated it's  Sapphire jubilee on 1946