A word of caution.
The statutes listed at the site are subject to the interpretation of the courts. As an example, in Cleveland, Ohio, carrying a folding knife with a 2-1/2 inch blade in a pants pocket has been found to be "carrying a concealed [deadly]weapon," while in Akron (an hour's drive away) a 4-inch folder was found not to be a "deadly weapon" in violation of the same law, largely because it required two hands to open it (!).
This goes on in every state. So be careful.