Biggest Marathons
The biggest marathons draw tens of thousands of finishers — city-wide celebrations where the crowd noise carries you through the late miles. Field size shapes everything from corral logistics to aid-station density and the atmosphere on the course.
Every marathon in our database is ranked here by typical finisher count — 535 marathons in total. New York City Marathon leads the list.
Looking for a fast course rather than a big field? Try our fast marathons or World Marathon Majors hubs.
Frequently Asked Questions
- What is the biggest marathon in the world?
- The New York City Marathon is typically the world's largest marathon by finisher count, followed by other major city races such as Chicago and London. Field size changes year to year — use the cards below for typical finisher counts in our database.
- Which marathon has the most finishers?
- World Marathon Majors and large capital-city races dominate finisher counts. This hub sorts every marathon in the Marathon Focus catalog by typical finishers so you can compare scale and atmosphere.
- Are bigger marathons harder to run?
- Large fields mean more crowded early miles, longer corral waits, and busier aid stations — but also better on-course support and atmosphere. Smaller races can feel calmer but may have fewer amenities; choose based on the experience you want.
Last updated 11 October 2026. Edition dates and course details are reviewed regularly.