The 2025 Boston Marathon had a total of 31,670 runners officially entered. Of those, 28,845 runners actually started the race, and 28,384 finished it, which is a 98.4% completion rate

. Breaking down the finishers by gender:

• Men: 16,103 finishers
• Women: 12,210 finishers
• Non-binary: 71 finishers

Therefore, over 28,000 runners participated in the Boston Marathon in 2025, with just under 29,000 starting the race and about 28,400 finishing it.