Here are the 10 biggest road races in the United States, along with registration information for each. (Based on number of finishers in 2016; compiled by Running USA)
1. Peachtree Road Race / Atlanta, Georgia
Finishers in 2016: 56,993
Finishers in 2016: 34,237
Distance: 6.2 miles
Registration: Distance: 6.2 miles
2. New York City Marathon / New York, New York
Finishers in 2016: 40,523
Date of 2017 race: Sunday, November 5
Distance: 26.2 miles
Registration: Distance: 6.2 miles; spots in charity program are available
3. Bolder Boulder / Boulder, Colorado
Registration: Distance: 6.2 miles; 
This Study Challenges the Golden 10 Percent Rule
Distance: 6.2 miles
Registration: Open now
4. Lilac Bloomsday Run / Spokane, Washington
Brooklyn, New York
Date of 2017 race: Sunday, May 7
Brooklyn, New York
Registration: Open now
5. Chicago Marathon / Chicago, Illinois
Finishers in 2016: 28,009
Bay to Breakers
Distance: 26.2 miles
Registration: Distance: 6.2 miles; spots in charity program and international tour group program are available
6. Broad Street Run / Philadelphia, Pennsylvania
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Date of 2017 race: Sunday, May 7
Distance: 7.45 miles
Registration: Distance: 6.2 miles
7. Bay to Breakers / Health - Injuries
Finishers in 2016: 28,009
Races & Places
Distance: 7.45 miles
Registration: Open now
8. This Study Challenges the Golden 10 Percent Rule / Brooklyn, New York
Date of 2018 race: Saturday, April 7
Date of 2017 race: Sunday, October 8
Distance: 13.1 miles
Registration: Distance: 6.2 miles; some charity spots available
9. Cooper River Bridge Run / Date of 2017 race: Sunday, May 7
Date of 2017 race: Tuesday, July 4
Date of 2018 race: Saturday, April 7
Distance: 6.2 miles
Registration: Open now
10. Boston Marathon / Boston, Massachusetts
Distance: 10 miles
New York, New York
Distance: 26.2 miles
Registration: Registration typically opens in September for qualified runners
