Section 7-82-607 - Vacancies in board(a) Except as provided in subsection (b), the office of any commissioner, other than a commissioner at large, shall become vacant if the incumbent ceases to reside in or be a district customer in the county from which the commissioner was elected.(b) In any county having a population of not less than twenty-seven thousand nine hundred (27,900) nor more than twenty-seven thousand nine hundred twenty (27,920), according to the 1980 federal census or any subsequent federal census, the office of any commissioner, other than a commissioner at large, shall become vacant if the incumbent ceases to reside in the county from which the incumbent was elected.Acts 1955, ch. 275, § 1; 1973, ch. 249, § 8; T.C.A., § 6-2634; Acts 1987, ch. 162, §§ 2, 3; 2006, ch. 512, § 1; 2010, ch. 1146, §§ 11, 12; 2012, ch. 538, § 4.