Approximately 0.5 percent of the United States population has run a marathon. In 2013, there were an estimated 541,000 marathon finishers in the United States, according the 2014 Annual Marathon Report published by Running USA.
The number of marathon finishers has steadily increased year to year, jumping from 353,000 in 2000 to the more than 500,000 in 2013. There were more finishers in 2013 than ever previously recorded. Approximately 57 percent of the 2013 finishers were men. The largest percentage of male marathon finishers were between the ages of 35 and 44. The largest percentage of female finishers were between 25 and 34.