Boston Marathon | By the numbers

36,000 entrants

10,000 volunteers

1,900 medical personnel

1,500 Boston police officers

3,500 total uniformed officers

450 state police officers

600 members of the National Guard

More than 100 cameras were installed along the Boston portion of the marathon route

More than 50 observation points will be set up around the finish line

13 ambulances located along Boston portion of the race to support 24 ambulances providing service in Boston

140 EMS personnel on bikes, utility vehicles, foot patrol and in medical tents in addition to the rest of the personnel in the city

The Boston Marathon generates an estimated $142 million for the local economy

Source: Boston Marathon website