Tennessee Code Title 6. Cities and Towns § 6-51-302

(a) Whenever the boundaries of the corporate limits of municipalities are contiguous and such boundaries either are not in line with the street and lot layout of the municipalities or do not conform to existing or proposed public rights-of-way, drainage ways, utility easements, or railroad rights-of-way, these municipalities may adjust such boundaries by contract between themselves so as to avoid confusion and uncertainty about the location of the contiguous boundary or to conform the contiguous boundary to an existing public right-of-way, drainage way, utility easement, or railroad right-of-way, or to dedicated public right-of-way or lot line that appears on a recorded plat or deed, or to a proposed public right-of-way, drainage way, utility easement, or railroad right-of-way that is a part of either a comprehensive municipal or county plan, or both, approved by a municipal or county governmental body or by a legally constituted municipal planning commission, regional planning commission, or the state planning office.

(b) Such boundary adjustments may not place any elected official into a voting or political subdivision not presently in the district that such elected official represents, and no such boundary shift may occur any less than ninety (90) days prior to any election in which affected citizens may participate if such boundary adjustment had not occurred.