Ohio Rev. Code Ann. § 715.72
(A) As used in sections 715.72 to 715.81 of the Revised Code:
(C) One or more municipal corporations, one or more townships, and, under division (D) of this section, one or more counties may enter into a contract pursuant to which they create as a joint economic development district one or more areas for the purpose of facilitating economic development to create or preserve jobs and employment opportunities and to improve the economic welfare of the people in this state and in the area of the contracting parties.