This guide is for general information only and is not legal advice. Laws change — verify current rules with your state DOT or a licensed attorney before relying on this for any legal matter. Read full disclaimer.
The rule
There is no statewide rule on sidewalk cycling — it is left to cities and counties in Illinois. The Illinois Vehicle Code (625 ILCS 5/) does not address bicycles on sidewalks; local jurisdictions decide. Chicago Municipal Code § 9-52-020(b) prohibits any person aged 12 or older from riding a bicycle on a sidewalk anywhere in the city unless the sidewalk is designated as a bike route, with fines from $50 to $200. Evanston, Oak Park, and most suburban Cook County villages have similar age-based or business-district restrictions; downstate cities vary widely.
What this means in practice
Because Illinois doesn't set a statewide rule, the answer is "it depends on the city." Central business districts, downtown cores, and school zones are the most commonly restricted areas. Always check the local municipal code before you ride on a sidewalk.