Idaho Code § 59-906
(1) Except as provided in subsection (2) of this section, all vacancies in any county office of any of the several counties of the state, except that of the county commissioners (who shall be appointed by the governor), shall be filled by appointment by the county commissioners of the county in which the vacancy occurs in accordance with the procedure prescribed below until the next general election, when such vacancy shall be filled by election.
The vacancy shall be filled as follows: the county central committee of the same political party, if any, of the former officer, whose office is vacant, shall submit a list of three (3) nominations to the board of county commissioners within fifteen (15) days from the day the office is vacated. The board of county commissioners shall fill the vacancy by appointment from the submitted list within fifteen (15) days. Should no appointment be made within fifteen (15) days, the county central committee of the political party submitting the nominations shall designate one (1) of the three (3) nominees to fill the vacancy. The person selected shall be a person who possesses the same qualifications at the time of his appointment as those provided by law for election to the office. Upon failure of the committee to make a selection before the expiration of the additional fifteen (15) day period, the board of county commissioners shall, within five (5) days, fill the vacancy by appointing a person having the same qualifications at the time of his appointment as those provided by law for election to the office. If the person who has vacated the office has not been affiliated with a political party, the vacancy shall be filled by the board of county commissioners by appointment of a person having the same qualifications at the time of his appointment as those provided by law for election to the office.
[(59-906) 1899, p. 67, sec. 9; reen. R.C. & C.L., sec. 322; C.S., sec. 458; I.C.A., sec. 57-906; am. 1975, ch. 21, sec. 6, p. 30; am. 1982, ch. 4, sec. 2, p. 7; am. 1984, ch. 192, sec. 1, p. 441; am. 1991, ch. 81, sec. 1, p. 182.]