Chicago Marathon

You can also find a course map in .pdf form to look at or print out from the Course and Amenities section.

You will find other details needed marked on the map such as Aid Stations, Medical Support, Refreshments, Street Closures and much more..

Source: http://www.onlykent.com/20101008/2010-chicago-marathon-times-route-map-spectator-information-and-more/