2011 ORS § 547.015¹
Verification and filing of petition
The petition shall be verified by one or more of the petitioners to the effect that they have read the petition and believe the allegations to be true. It shall be filed in the office of the county clerk of the county in which the lands described are situated. If the lands are situated in more than one county it shall be filed in the office of the county clerk of the county in which more of the lands are situated than in any other county.