Average Marathon Finishing Time

According to MarathonGuide.com, the averaging finishing time for all runners who completed a U.S. marathon in 2005 was 4:45:47.

"2005 saw a record number of marathon finishes in the USA, with a 6.0% growth in the number of marathon finishers from 2004 to 2005. More than 383,000 marathon finishing times were recorded in the USA in 2005 - an increase from more than 361,000 finishes in 2004."