The Boston Marathon is the oldest continually operating marathon. The 122nd running of the Boston Marathon will take place this Monday, April 16. This map indicates cooler climates host more marathons than warmer climates.

The number of marathon race finishers across the nation has steadily grown over the past 40 years. Since 1976, the number of race finishers has grown from 25,000 to more than a half million in 2016.

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