Illinois statewide preemption under the Firearm Concealed Carry Act bars most municipal gun ordinances, but Cook County's grandfathered assault weapons ban (Ord. 06-O-50) survives in unincorporated areas and several suburbs.
Under 430 ILCS 66/90, the Firearm Concealed Carry Act preempts local regulation of handgun possession, transport, and concealed carry. Cook County's Blair Holt Assault Weapons Ban (Ord. 06-O-50, codified at Ch. 54, Art. III) was grandfathered when the state act passed in 2013 and applies in unincorporated Cook County and any non-home-rule suburbs that did not opt out. The Illinois Supreme Court upheld the ordinance in Wilson v. Cook County (2017). Home-rule suburbs may pass their own assault-weapon rules; non-home-rule cities cannot.
Possessing a banned assault weapon in unincorporated Cook County or non-opted-out suburbs is a Class A misdemeanor; civil fines $5,000 first offense.
See how Des Plaines's local firearms preemption rules stack up against other locations.
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