The 26.2 mile race kicks off today, and with more than 20,000 racers from Hopkinton to Boston, you don't want to miss your friends and family.
To track a runner, text RUNNER to 345678 and receive text message updates when they pass the the 10K, half-marathon, 30K, and finish line.
To find bib numbers, search by zip codes on the Boston Athletic Association website.
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