Tennessee Code Title 6. Cities and Towns § 6-54-301

The police authority of all incorporated towns and cities shall extend to a distance of one (1) mile from the lawful corporate limits thereof, for the suppression of all disorderly acts and practices forbidden by the general laws of the state; provided, that such jurisdiction of an incorporated town or city shall not be hereby extended beyond the limits of the county in which any part of such town is situated, or so as to come within one (1) mile of any other incorporated town or city.