( CNN ) -- The Boston Marathon , which had been run since 1897 , was rocked Monday by two explosions at the finish line . Here are a few facts , by the numbers , about the 2013 race , according to the Boston Athletic Association : . -- In all , 26,839 runners and wheelchair racers registered . Of them , 15,233 are men , and 11,606 are women . -- There are participants from 56 U.S. states and territories . -- Seventy-four countries of residence and 96 countries of citizenship are represented .
Boston Marathon has been run since 1897 . In all , 26,839 runners and wheelchair racers registered . There are participants from 56 U.S. states and territories .