The half marathon distance is as big as ever in the United States. According to Running USA, 2014 saw the 13.1-mile distance surpass 2 million finishers for the first time.
The growth has led to an explosion in big races, too—of the 2,200 half marathons in the U.S., 32 of them had more than 10,000 finishers (in 2000, there was just one). Of those, seven had more than 20,000 finishers.
Here’s a closer look at those races that bring a crowd—the largest half marathons in the United States.