Race guides / Big fields and the Majors

The biggest marathons.

Marathons ranked by how many runners finished the last edition. A big field means closed city streets, crowds the whole way and plenty of runners at your pace, at the cost of a crowded start and a harder entry. The top 30 of 210 marathons in 19 countries, racing from 8 Nov 2026 to 7 Nov 2027. The biggest, TCS London Marathon, had 56,000 finishers last time.