The official site of Chicago Marathon is www.hardrock100.com . 16 (from 6 confederations) teams competed in Chicago Marathon . The venue for Chicago Marathon was Fort Copacabana,241.5 km (150.1 mi) . It was held in 28 July – 12 August 2012 . 8 events were there in Chicago Marathon . Chicago Marathon was established on 1881; 138 years ago (1881)
16 teams competed against each other in Chicago Marathon