Oregon Revised Statutes Elections § 250.155

(1) ORS 250.165 to 250.235 carry out the provisions of section 10, Article VI, Oregon Constitution, and shall apply to the exercise of initiative or referendum powers regarding a county measure, unless the county charter or ordinance provides otherwise.

(2) ORS 250.165 to 250.235 apply to the exercise of initiative or referendum powers regarding a county measure in a county that has not adopted a charter under section 10, Article VI, Oregon Constitution.