Tennessee Code Title 2. Elections § 2-13-208

(a) Notwithstanding other provisions of this part, municipal elections shall be nonpartisan. Municipal elections shall not require candidates to be nominated by political parties unless the municipality's charter specifically permits partisan elections. When a municipality's charter allows partisan elections, political parties may nominate candidates for municipal office by using the primary election provisions of this title or as otherwise authorized by the rules of the party.

(b) In any county having a metropolitan form of government, the election of the county mayor and the members of the legislative body of such metropolitan government shall be considered to be municipal elections within the meaning of this section; however, this section shall not be construed to require a partisan election for any other officers of the metropolitan government if the charter of such metropolitan government provides that elections for such officers shall be nonpartisan.