Each organized county shall have a board of commissioners consisting of not less than three nor more than seven members, each of whom shall be elected at a general election only and whose term of office shall be four years commencing on the first Tuesday of January following election. Any commissioner who represents an even - numbered district shall run for election at the general election at which the President is elected; any commissioner who represents an odd - numbered or unnumbered district shall run for election at the general election at which the Governor is elected. Source: SDC 1939, § 12.0601; SL 1998, ch 39 , § 1.