Tennessee Code Title 7. Consolidated Governments and Local Governmental Functions and Entities § 7-35-302

This part shall apply to municipalities that adjoin one another, or that are in such proximity to one another as to make it of the interest to both that such system of each be in substance consolidated and unified, the question of the mutual advantages to accrue to such municipalities, respectively, to be determined by the municipalities, and their determination of the advantages by entering into such contract or contracts to be conclusive.