How many people run the chicago marathon

On 6 October 2026, organizers of the Bank of America Chicago Marathon confirmed that the upcoming race is set to host its largest field of participants in the event's history. Following the conclusion of the final registration phases and the completion of the lottery process, officials announced that approximately 52,000 runners are officially registered to toe the starting line this Sunday. This figure represents a significant milestone for the World Marathon Major, reflecting a continued surge in global interest for long-distance road racing. The race committee noted that the increase in capacity was made possible through enhanced logistical planning and expanded wave starts designed to manage the density of the course through Chicago’s neighborhoods. While the total number of registered participants is at an all-time high, organizers emphasized that the focus remains on ensuring a safe and efficient experience for both elite athletes and the tens of thousands of recreational runners who contribute to the city's vibrant atmosphere. The event continues to serve as a major economic driver for the region.