A county treasurer for each county having a population of more than 56,000 according to the 1930 federal census and not otherwise having a county depository or other custodian of its funds in lieu of a county treasurer shall be elected by the qualified voters thereof and he shall hold office for four years from the first Monday after the second Tuesday in January next after his election and until his successor is elected and qualified.
Ala. Code § 11-4-20 (1975)