Slots are still open for the full marathon, but the half marathon has sold out for the first time in the race's four-year history. That means more than 5,000 runners will be taking on the 13.1-mile course.
The full marathon is reaching capacity, as well. A maximum of 3,000 runners can compete in the 26.2-mile race.
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This year's race will start and finish on the grounds of RFK Stadium. The entire course is run inside the District.
For more information on this year's race, click here.