Okla. Stat. tit. 15, § 15-218: Restraint of trade - Exception as to sale of goodwill

One who sells the goodwill of a business may agree with the

buyer to refrain from carrying on a similar business within a

specified county and any county or counties contiguous thereto, or a

specified city or town or any part thereof, so long as the buyer, or

any person deriving title to the goodwill from him carries on a like

business therein. Provided, that any such agreement which is

otherwise lawful but which exceeds the territorial limitations

specified by this section may be deemed valid, but only within the

county comprising the primary place of the conduct of the subject

business and within any counties contiguous thereto.