The Biggest Marathons in the U.S.

The marathon represents the ultimate challenge for many runners, testing both mental determination and months of physical training. It's no wonder so many runners turn out across the country to compete in them­—or to simply get across the finish line.

These are currently the 10 largest marathons in the U.S., according to Running USA.

Note: These numbers reflect the 2014 races, which are the most recent numbers available from Running USA.

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