Oregon Revised Statutes Corporations and Partnerships § 65.307

(1) A board of directors must consist of one or more individuals for a mutual benefit or religious corporation and three or more individuals for a public benefit corporation, with the number specified or fixed in accordance with the articles of incorporation or bylaws.

(2) The articles of incorporation or bylaws may establish a variable range for the size of the board of directors by fixing a minimum and maximum number of directors. If a variable range is established, the number of directors may be fixed or changed periodically, within the minimum and maximum, by the members or the board of directors. If the articles of incorporation establish a fixed or a variable range for the size of the board of directors and the corporation has members entitled to vote for directors, then only the members may change the range for the size of the board or change from a fixed or a variable-range size board.