Marathon from the start at Windsor Castle to the royal entrance to the White City Stadium, followed by a lap (586 yards 2 feet; 536 m) of the track, finishing in front of the Royal Box. The course was later altered to use a different entrance to the stadium, followed by a partial lap of 385 yards to the same finish. The modern standard distance for the marathon was set by the International Amateur Athletic Federation (IAAF) in May 1921 directly from the length used at the 1908 Summer Olympics in London. An official IAAF marathon course is 42.195 km (42
Dublin Marathon levels have since increased significantly year-on-year with 19,500 completing the 2016 event. In 2001 the marathon became part of the Dublin Race Series, which includes pre-marathon events of 5 miles, 10 kilometres, 10 miles and half marathon distance over the preceding months, run in the Phoenix Park and Swords. A competitor died while running in the 2006 marathon and another in the 2013 marathon. The Dublin marathon is associated to a series of 4 other races in the calendar year. These races include, The Irish Runner 5 mile, The Frank Duffy 10 mile, Fingal 10k and the Dublin half Marathon.