The Chicago Marathon course passes through 29 neighborhoods and typically draws more than one million spectators lining the streets.
October 10, 2025
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General description of the race route and spectator turnout.
The Chicago Marathon had 52,150 finishers in 2024, including about 15,000 international participants; among foreign countries, Mexico was the most-represented with 3,790 participants in 2024, followed by the United Kingdom (2,814), Canada (2,442) and Brazil (1,811).
October 10, 2024
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Participation and country-level breakdown for the Chicago Marathon in 2024.