There was also a sprint distance route available, which was roughly half those lengths.
Organizers said about 100 racers would do three triathlons this weekend. They did a swim, cycle and run for 68 miles.
ABC7 reporter Michelle Gallardo had the day off Sunday, but she was not sleeping in. She was one of thousands of athletes taking part in the annual Chicago Triathlon Sunday morning.
Other participants included a group of police, firefighters, FBI agents and other 'first responders' who trained together and were competing together in the same wave.
Chicago police Commander Scott Ruiz served as coach of the team and talked about the experience on ABC7 News Sunday Morning.
There were different start times for different groups of triathletes, including those who are physically challenged, law enforcement and professional athletes.
There was even a start time set aside for 73-year-old Bob Oury, who was participating in his 8th Chicago Triatlon. Organizers say he's never missed a race.
The Associated Press contributed to this report.