1884; 135 years ago (1884) is when US Open was established  . 11 from 2 nations were the competitors in US Open . 24 (from 5 confederations) were the number of teams who competed in US Open . The venue for US Open was Georgia Dome,New York City, New York,,United States . The sport has the official site chicagomarathon.com . 18 events were there in US Open
US Open will celebrate it's  Bicentennial jubilee on 2094