Over $50 million was generated last year.
A recent report indicates that $220 million was raised for the Windy City.
More than $45 million is anticipated.
A study conducted by Fisher College of Business measured the event's impact on the local community.
The marathon is timed when the city most needs the tourists dollars.
Ten cities across the country met the program's criteria
The race delivers $100 million in positive economic impact to Hawaii.