Illinois knife laws are complex and vary significantly depending on the type of knife, blade length, intent, and location. At the state level, most pocket knives and common folding knives are legal to own and carry, but there are important restrictions and exceptions to understand.
Switchblades and automatic knives are illegal to possess or carry in Illinois unless you are over 21 and have a valid Firearm Owner’s Identification (FOID) card. Even with a FOID card, local ordinances—such as those in Chicago—may still prohibit these knives entirely. Ballistic knives, which can propel a blade by mechanical means, are strictly prohibited statewide, regardless of FOID status.
Blade length is a key factor. Knives with blades shorter than 3 inches are generally legal to carry without a special permit. Carrying knives with blades 3 inches or longer is subject to stricter regulation, especially in public places or government buildings, where such knives are often banned outright. In Chicago, the law is even stricter, prohibiting the carry of any knife with a blade longer than 2.5 inches.
Intent and location matter. Carrying any knife with the intent to use it unlawfully against another person is illegal, regardless of blade length or type. Additionally, knives are banned in certain locations, such as schools, courthouses, and government buildings, and violations can result in a Class A misdemeanor, punishable by up to one year in jail and a $2,500 fine. Some locations, like venues serving alcohol or requiring paid admission, also restrict knife carry.
Open carry of most knives is generally legal in Illinois unless the knife is carried with unlawful intent or brought into a restricted area. Concealed carry of knives with blades 3 inches or longer can be a violation unless you have a valid, lawful reason—such as work requirements—for carrying the knife. Local ordinances may further restrict both open and concealed carry, so it is crucial to check city and county regulations.
Minors face special restrictions. Illinois law prohibits minors from carrying knives on school grounds, and guardians may face fines if minors are found in violation.
Penalties for violating Illinois knife laws range from misdemeanors to felonies, depending on the type of knife, intent, and location. For example, carrying a restricted knife or bringing any knife into a school can result in a Class A misdemeanor, while carrying with unlawful intent or violating multiple statutes may lead to felony charges.
Pocket knives with blades under 3 inches are generally legal in Illinois, but switchblades, ballistic knives, and longer blades face significant restrictions. Local laws, especially in cities like Chicago, can be much stricter than state law. Always check both state and local regulations before carrying any knife in Illinois to ensure compliance and avoid serious legal consequences.
Sources
[1] https://www.akti.org/state-knife-laws/illinois/
[2] https://www.couteaux-morta.com/en/illinois-knife-laws/
[3] https://tkellknives.com/knife-laws-in-illinois-navigating-legal-carry-and-restrictions/
[4] https://edc.ninja/illinois-knife-laws/
[5] https://nobliecustomknives.com/us-knife-laws/illinois-knife-laws/
