Oregon Revised Statutes Miscellaneous Matters Related to Government and Public Affairs § 198.760

(1) Each person signing a petition may also print the person's name on the petition and shall add after the signature the date of signing. If a person is signing the petition as an elector, the person shall add after the signature the person's place of residence, giving street and number or a designation sufficient to enable the place of residence to be readily ascertained. If the signer is signing the petition as a landowner, the number of acres of land owned by the signer and the name of the county whose assessment roll is used for the purpose of determining the signer's right to vote shall be stated in the body of the petition or indicated opposite the signature. If the signer is a legal representative of the owner, the signature shall be accompanied by a certified copy of the signer's authority to sign as a legal representative.

(2) After a petition has been offered for filing, a person may not withdraw the person's name therefrom.

(3) A petition shall designate not more than three persons as chief petitioners, setting forth their names and mailing addresses. A petition may consist of a single instrument or separate counterparts.