Okla. Stat. tit. 19 § 865.51
For the purpose of cooperating with the State of Oklahoma in conserving the natural resources of the state, and in promoting the health, safety, peace and general welfare of the people of the state, there may be provided in any county of the State of Oklahoma county planning in the manner herein provided, and for that purpose there is hereby authorized to be created in each of such counties a county planning commission and a county board of adjustment with the respective powers and duties as set out in this act. In no county shall there be at the same time a county planning commission established pursuant to this section and a metropolitan area planning commission established pursuant to Section 866.1 of Title 19 and Section 863.2 of Title 19 of the Oklahoma Statutes. Provided that county commissioners may by proper resolution confer authority to any metropolitan area planning commission located in such county for the purposes of planning for unincorporated areas existing in county. Provided further that any county planning commission created under the provisions of this act shall have no jurisdiction over the area covered by any lake area planning and zoning commission in any county created pursuant to Section 866.36 of Title 19 of the Oklahoma Statutes.
Okla. Stat. tit. 19, § 865.51