Oregon Revised Statutes Elections § 250.205

(1) This section applies to a county that has not adopted a charter under section 10, Article VI, Oregon Constitution.

(2) A referendum petition must be filed not later than the 90th day after the adoption of a nonemergency county measure.

(3) A petition to refer a county measure must contain at least the number of signatures of electors residing in the county that is equal to four percent of the total number of votes cast in the county for all candidates for Governor at the election at which a Governor is elected for a four-year term next preceding the filing of the petition for verification of signatures.

(4) A petition to initiate a county measure must contain at least the number of signatures of electors residing in the county equal to six percent of the total number of votes cast in the county for all candidates for Governor at the election at which a Governor is elected for a four-year term next preceding the filing of the petition for verification of signatures.