Oregon Revised Statutes State Legislative Department and Laws § 171.051

(1) When any vacancy occurs in the Legislative Assembly due to death or recall or by reason of resignation filed in writing with the Secretary of State or a person is declared disqualified by the house to which the person was elected, the vacancy shall be filled by appointment if:

(2) The person appointed under the provisions of subsection (1) of this section shall be a citizen qualified to hold the office, an elector of the affected legislative district and a member of the same political party for at least 180 days before the date on which the vacancy occurred. The political affiliation of a person appointed under subsection (1) of this section shall be determined under ORS 236.100. The appointment shall be made by the county courts or boards of county commissioners of the affected counties pursuant to ORS 171.060 to 171.064. When the provisions of ORS 171.060 (1) are applicable, the appointment shall be made from a list of not fewer than three nor more than five nominees who have signed written statements indicating that they are willing to serve furnished by the Secretary of State. If fewer than three names of nominees are furnished, a list shall not be considered to have been submitted and the county courts or boards of county commissioners shall fill the vacancy. The vacancy must be filled by appointment within 30 days after its occurrence or not later than the time set for the convening of the special session described in subsection (1)(e) of this section when that is the basis for filling the vacancy.

(3) If the appointing authority required by this section to fill the vacancy does not do so within the time allowed, the Governor shall fill the vacancy by appointment within 10 days.

(4) Notwithstanding any appointment under the provisions of subsection (1)(c) of this section, when a vacancy occurs in the office of a state Senator before the 61st day before the first general election to be held during that term of office, the remaining two years of the term of office shall be filled by the electors of the affected legislative district at the first general election.

(5) Candidates for the remaining two years of the term of office of a state Senator under subsection (4) of this section shall be nominated as provided in ORS chapter 249 except as follows:

(6) The remaining two years of the term of office of a state Senator under subsection (4) of this section will commence on the second Monday in January following the general election. Any appointment under the provisions of subsection (1)(c) of this section shall expire when a successor to the office is elected and qualified.