Oregon Revised Statutes Counties and County Officers § 215.605

For the protection of the public health, welfare and safety, the governing body of a county may adopt ordinances establishing housing codes for the county, or any portion thereof, except where housing code ordinances are in effect on August 22, 1969, or where such ordinances are enacted by an incorporated city subsequent to August 22, 1969. Such housing code ordinances may adopt by reference published codes, or any portion thereof, and a certified copy of such code or codes shall be filed with the county clerk of said county.