Tennessee Code Title 2. Elections § 2-9-109

(a) Precincts having more than three hundred (300) registered voters shall be equipped by the county in which they are located with voting machines for use in all elections and smaller precincts may be so equipped. If the governing body of any county does not provide voting machines as required by the preceding sentence, the county election commission, instead of the county governing body, shall equip the precincts with voting machines in accordance with §§ 2-9-112 -- 2-9-114. However, in counties having populations of not less than twelve thousand one hundred (12,100) nor more than twelve thousand two hundred (12,200), according to the federal census of 1970 or any subsequent federal census, voting machines for any precinct having fewer than one thousand (1,000) registered voters shall not be purchased without the approval of the county commission.

(b) Any municipality with a population of five thousand (5,000) or less, according to the 1980 federal census or any subsequent federal census, may elect to use paper ballots instead of voting machines for municipal elections, when there is no opposition for any of the offices involved. Such decision shall be made known to the county election commission at the time the municipality directs the election commission to call its election.