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Parking: Please park in National Park Service Lot B or C, located at 971 Ohio Drive, SW, Washington, DC, just before the southern intersection with Ohio Drive. Parking is free for race registrants until 10 AM. A parking permit will be e-mailed to you a few days prior to race day that will allow you access into the lot. Lot C is about a 10-minute walk to check-in and the race starting line. Download a map here.