Ohio has no preemption statute covering knives, meaning every stupid municipal corporation is free to impose their own constraints, subject only to the whims of their elected officials. Ohio 2923.11 & 2923.12. & - 2923.20 Y None Ballistic Knife, Switchblade Knife, Spring blade Knife, Gravity Knife, or similar weapon are illegal. ;An ordinary pocket Many cities have 2 1/2" length Max. knife that is not possessed, carried or used as a weapon is not a "deadly weapon" No Blade Length in OH Laws. Akron, OH 137.02 Y 2.5" on or about his person a pistol, a knife having a blade two and one-half inches Highland Hts, OH 549.11 Y 2.5" or any knife having a blade two and one-half inches in length or longer, Bay Village, OH 549.12 Y 2.5" or other knife having a blade of two and one-half inches in length or longer, Dayton, OH 138.02 ? Must show affirmative defense for carrying weapon. Strongville, OH 672.11 Y 2.5" or other knife having a blade of two and one-half inches in length or longer, Cuyahoga Falls, OH 549.1 Y 2.5" or other knife having a blade of two and one-half inches in length or longer, Warrensville Hts. OH 741.07 Y 2.5" or other knife having a blade of two and one-half inches in length or longer, Lyndurst, OH 672.13 Y 2.5" in his or her possession any knife having a blade length of more than two and one-half inches Tallmadge, OH 549.13 Y 2.5" or other knife having a blade of two and one-half inches in length or longer, Summit Co. OH 549.09 Y 2.5" or other knife having a blade of two and one-half inches in length or longer,