Tennessee Code Title 7. Consolidated Governments and Local Governmental Functions and Entities § 7-1-113

(a) Notwithstanding a provision of a metropolitan government charter or § 7-2-108 to the contrary, the membership of a metropolitan council must not exceed twenty (20) voting members.

(b) If the membership of a metropolitan council is required to be reduced in order to comply with subsection (a), then:

(c) With respect to metropolitan governments formed after March 9, 2023, the metropolitan council must not be composed of more than twenty (20) voting members.  The adopted charter of a newly formed metropolitan government may provide for the initial election of the members of its governing body on a date as set by the charter;  provided, that the initial terms do not exceed four (4) years and expire on August 31 after the next subsequent general election held.

(d) This section does not preempt a metropolitan government from specifying in its charter the manner in which to hold a special election to fill a vacancy on the metropolitan council.

(e) This section does not preempt a future change in the size of a metropolitan council through an amendment to the metropolitan charter;  provided, that the size of a metropolitan council does not exceed twenty (20) members.