You can carry a pocket knife in Maryland. State law treats an ordinary folding pocket knife — what the statute calls a “penknife without a switchblade” — as something other than a weapon, which means you can carry one openly or concealed almost anywhere in the state. The real limits are the type of knife, a short list of locations, and local ordinances that go further than state law.
What State Law Actually Says
Criminal Law § 4-101 lists the items Maryland treats as “weapons”: dirk knives, bowie knives, switchblades, star knives, razors, and nunchaku. The statute then carves out an exception for a “penknife without a switchblade,” which drops ordinary folding knives out of the weapon category entirely.1Maryland General Assembly. Maryland Criminal Law Code Section 4-101 – Dangerous Weapons
Maryland courts read “penknife” broadly. In Mackall v. State (1978), the Court of Appeals said penknives “are commonly considered to encompass any knife with the blade folding into the handle, some very large.” In Bacon v. State (1991), the same court held that a folding knife with a five-inch blade, open and locked, was still a penknife under the statute. A locking mechanism does not change the classification, and neither does blade length. If the blade folds into the handle, it’s a penknife.
Because a penknife falls outside the “weapon” definition, the concealment prohibition in § 4-101 doesn’t reach it. You can carry a folding pocket knife in your pocket, clipped inside a waistband, or openly on your belt. Using or brandishing it threateningly is a different matter and can draw charges under other statutes no matter what kind of knife is in your hand.
Knives That Are Treated as Weapons
The following are weapons under § 4-101, and carrying them concealed — or openly with intent to injure — is a crime:
- Switchblades: knives with a blade that opens automatically by pressure on a button, spring, or other device in the handle.2Maryland General Assembly. Maryland Code Criminal Law 4-105
- Dirk knives: fixed-blade knives designed primarily for stabbing.
- Bowie knives: large fixed-blade knives historically associated with combat.
- Star knives: throwing stars and similar multi-pointed bladed implements.
Switchblades Versus Assisted-Opening Knives
The line between a switchblade and a legal assisted-opening knife turns on the phrase “in the handle.” A switchblade’s opening mechanism sits in the handle and launches the blade when you press a button. An assisted-opening knife uses a spring that is biased toward keeping the blade closed; you have to push the blade itself partway open before the spring finishes the motion. Because the activation is on the blade, these knives generally fall outside the switchblade definition.2Maryland General Assembly. Maryland Code Criminal Law 4-105
That distinction is mechanical, and an officer at a traffic stop may not see it immediately. If you carry an assisted-opening knife, be ready to explain how it works. Baltimore City also has an ordinance with broader language than the state statute — more on that below.
Where You Still Can’t Carry
Public School Property
Criminal Law § 4-102 bans deadly weapons of any kind on public school grounds. The statute applies to students, parents, and visitors, and it covers all knives regardless of type or size. The handful of exceptions cover law enforcement, hired school security, organized shooting activities for educational purposes, and demonstrations with written permission from the principal — none of which help a parent who forgot a pocket knife was in their jacket at a school play.3Maryland General Assembly. Maryland Criminal Law Code Section 4-102 – Deadly Weapons on School Property
Federal Buildings and Courthouses
Federal law under 18 U.S.C. § 930 makes it a crime to bring a dangerous weapon into a federal building or federal court facility. There is a specific exemption for pocket knives with blades shorter than 2½ inches. A folding knife with a blade of 2½ inches or longer is a federal violation if you carry it inside, with heavier penalties for courthouses and heavier still if you intended to use it in a crime.4Office of the Law Revision Counsel. 18 USC 930 – Possession of Firearms and Dangerous Weapons in Federal Facilities
Air Travel
TSA bars knives of any kind from carry-on bags. You can pack a knife in checked luggage if it is sheathed or securely wrapped, and the officer at the checkpoint has the final call.5Transportation Security Administration – TSA.gov. Knives
Local Ordinances Can Go Further
Maryland does not preempt local knife laws, so cities and counties can impose their own rules. You can be fully compliant with state law and still violate a city code.
Baltimore is the prominent example. Baltimore City Code § 59-22 restricts possession of knives “with an automatic spring or other device for opening and/or closing the blade.” That wording is broader than the state switchblade definition and may reach assisted-opening knives that are legal elsewhere in Maryland. If you carry a spring-assisted knife into Baltimore, check the city code first. Other jurisdictions, especially the more urbanized ones, may also have restrictions worth confirming before you travel with a knife.
Rules for Minors
Several counties impose nighttime limits on minors carrying dangerous weapons — openly or concealed — between one hour after sunset and one hour before sunrise. The counties include Anne Arundel, Baltimore, Caroline, Cecil, Harford, Kent, Montgomery, Prince George’s, St. Mary’s, Talbot, Washington, and Worcester. Specific terms vary by county, so parents of teenagers who carry a pocket knife should look up the local code.
Penalties
Carrying a § 4-101 weapon concealed, or carrying one openly with intent to injure, is a misdemeanor punishable by up to three years in prison, a fine up to $1,000, or both. If the evidence shows the weapon was carried with the deliberate purpose of injuring or killing someone, the court must impose the maximum sentence.1Maryland General Assembly. Maryland Criminal Law Code Section 4-101 – Dangerous Weapons
Possessing any knife on public school property under § 4-102 carries the same ceiling: up to three years, up to $1,000, or both.3Maryland General Assembly. Maryland Criminal Law Code Section 4-102 – Deadly Weapons on School Property
Federal and local violations stack on top of state law. A single knife in the wrong place can expose you to charges at more than one level, so where you carry matters as much as what you carry.