Ohio Rev. Code § 713.30
Any board of county commissioners and the legislative authority of a municipality may cooperate with other such boards or authorities of this state and of any adjoining state to create by agreement an interstate regional planning commission, whenever such subdivisions comprise a region which would benefit from cooperative governmental planning.
An interstate regional planning commission may also be created by compact through appropriate action by resolution, ordinance, or otherwise pursuant to law, of boards of county commissioners and legislative authorities of municipal corporations in this state, in agreement with the appropriate authorities of the political subdivisions of other states included in the region.
Any such compact shall specify: its purposes and duration; the powers and duties of the commission; the extent of the region; the precise organization and composition of the commission; the manner of financing and maintaining a budget for the purposes thereof; provisions for the partial or complete termination of the compact and the disposition of property, should this become necessary; and any other necessary and proper matters.
No such compact shall be in force and effect until it has been reviewed and approved by the attorneys general of the states included in the region to determine whether the compact is in proper form and compatible with all state laws and until it has been approved and signed by the governors of such states.
R.C. §713.30