ORS § 456.370
The exercise by a city or county of the powers granted by ORS 456.355 to 456.370 may be authorized by ordinance of the governing body of the city or county adopted by a majority of the members of its governing body present at a meeting of the governing body. Persons particularly interested, and the general public, shall be given an opportunity to be heard at that meeting, and notice to the public of the time and place of said meeting and of the subject of the ordinance proposed for enactment shall be published in the same manner as required prior to final enactment of a zoning ordinance. The ordinance may be adopted or amended and adopted at such meeting, and if adopted shall take effect immediately and need not be laid over or published or posted.
ORS 456.370