List of largest running events

This list of the largest running events in the world is based on the number of participants. If available, the number of "registered" participants or finishers may be specified. Not all participants will actually complete a race. Running USA's Road Running Information Center estimates that, on average, 80%-85% of registrants will complete a race. If a yearly event has consistently high participation, the year in which that event had the largest number of participants has been listed.

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