Missouri knife laws emphasize individual rights while imposing location-specific restrictions to ensure public safety. The state defines a “knife” broadly under RSMo § 571.010(12) but excludes ordinary pocketknives with blades ≤4 inches, making ownership and carry relatively permissive compared to other states.
Key Definitions
Missouri law defines a “knife” as any dagger, dirk, stiletto, or bladed hand instrument capable of inflicting serious injury or death by cutting or stabbing, excluding ordinary pocketknives with blades no longer than four inches.
Switchblades are defined separately under § 571.010(21) as knives opening automatically by button, gravity, or centrifugal force, but they are not broadly banned. No statewide blade length limit exists beyond this definitional threshold.
Ownership Rights
Most knives—including switchblades, automatics, balisongs, fixed blades, and throwing knives—are legal to own statewide with no broad bans. Switchblades and ballistic knives are prohibited only if violating federal law, such as interstate transport under 15 U.S.C. §§ 1241-1245. Minors face no specific ownership restrictions, though school rules apply.
Open Carry Rules
Open carry of any legal knife is generally permitted across Missouri, with no statewide type or length bans. However, brandishing—exhibiting a knife in an angry or threatening manner—violates § 571.030(1)(4) as a class E felony. Local ordinances may add rules, as Missouri lacks knife preemption (only firearms are preempted under § 21.750).
Concealed Carry Guidelines
Ordinary pocketknives (≤4 inches) can be carried concealed largely unrestricted. Larger “knives” cannot be concealed in areas restricted under § 571.107, such as police stations, courthouses, schools, churches without consent, airports, bars, hospitals, and posted private property. A concealed carry permit (CCP) exempts holders from many restrictions under § 571.030(4), even for knives. Pocket clip carry may count as concealed if not discernible by ordinary observation.
Restricted Locations
Knives (including ≤4-inch pocketknives as “weapons readily capable of lethal use”) are banned in schools, school buses/events (§ 571.030(10)), churches/election precincts/government buildings (§ 571.030(8)), and Bi-State transit (§ 70.441). Private property owners can post no-knife signs (§ 571.107(15)). CCP holders gain exemptions in many spots.
Penalties and Exceptions
Violations like unlawful concealed carry are class B misdemeanors (up to 6 months jail, $1,000 fine); felonies like brandishing carry up to 4 years and $10,000. Law enforcement, military, and certain officials are exempt. Federal mailing rules (18 U.S.C. § 1716) apply separately.
Practical Advice
Always check local ordinances in cities like St. Louis or Kansas City, and respect posted signs. For travel, keep knives in vehicles unloaded/unbrandished where possible. Consult official statutes or a lawyer for specifics—this guide summarizes as of 2026.
SOURCES:
- https://www.akti.org/state-knife-laws/missouri/
- https://nobliecustomknives.com/us-knife-laws/missouri-knife-laws/
