Okla. Stat. tit. 60, § 382

No gift, testamentary or otherwise, of any property, real or personal or both, or any interest therein including, but not limited to, right-of-way or right-of-way easements in the case of a county, to the State of Oklahoma, or to any county, city, town, or school district in the state, or to any combination thereof, if accepted upon behalf of the state, county, city, town, or school district, by the officer, proper governing board or commission thereof, nor the transfer of title thereto in accordance with such gift, or the will or other instrument by which such gift is made, nor the privilege of making or receiving such a gift, nor any income or profits derived by such state, county, city, town or school district from any such property or its use or disposition thereof, shall be subject to any form of tax.