I cant find any reference to blade length in Ohio. Here is what I found on knives:
Ohio - 2923.12. [prohibits carry and concealment of "any
deadly weapon" except for self-defense, without explicit
mention of knives].
- 2923.20 Unlawful transaction in weapons. (A) No person
shall... (3) Manufacture, possess for sale, sell, or
furnish to any other person other than a law enforcement
agency for authorized use in police work, any...
switchblade knife, springblade knife, gravity knife, or
similar weapon...
Here is a searchable Ohio database:
http://www.lawsource.com/also/usa.cgi?oh#Z3R
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Dennis Bible