Oregon Revised Statutes Counties and County Officers § 215.170

The powers of an incorporated city to control subdivision and other partitioning of land and to rename thoroughfares in adjacent unincorporated areas shall continue unimpaired by ORS 215.010 to 215.190 and 215.402 to 215.438 until the county governing body that has jurisdiction over the area adopts regulations for controlling subdivision there. Any part of the area subject to the county regulations shall cease to be subject to the two powers of the city, unless otherwise provided in an urban growth area management agreement jointly adopted by a city and county to establish procedures for regulating land use outside the city limits and within an urban growth boundary acknowledged under ORS 197.251.