Washington Revised Code Title 36. Counties § 36.16.110. Vacancies in office

(1) The county legislative authority in each county shall, at its next regular or special meeting after being appraised of any vacancy in any county, township, precinct, or road district office of the county, fill the vacancy by the appointment of some person qualified to hold such office, and the officers thus appointed shall hold office until the next general election, and until their successors are elected and qualified.

(2) If a vacancy occurs in a partisan county office after the general election in a year that the position appears on the ballot and before the start of the next term, the term of the successor who is of the same party as the incumbent may commence once he or she has qualified as defined in RCW 29A.04.133 and shall continue through the term for which he or she was elected.

(3) If a vacancy occurs in a nonpartisan county board of commissioners elective office or nonpartisan county council elective office, the person appointed to fill the vacancy must be from the same legislative district, county, or county commissioner or council district as the county elective officer whose office was vacated, and must be one of three persons who must be nominated by the nonpartisan executive or nonpartisan chair of the board of commissioners for the county. In case a majority of the members of the county legislative authority do not agree upon the appointment within sixty days after the vacancy occurs, the governor shall within thirty days thereafter, and from the list of nominees provided for in this section, appoint someone to fill the vacancy.

(4) If a vacancy occurs in a nonpartisan county board of commissioners elective office or nonpartisan county council elective office after the general election in a year that the position appears on the ballot and before the start of the next term, the term of the successor may commence once he or she has qualified as defined in RCW 29A.04.133 and shall continue through the term for which he or she was elected.