Oregon Revised Statutes Cities § 222.710

If any two cities vote to merge under ORS 222.610 to 222.710, the officer having charge and custody of the records of the city into which the city surrendering its charter is merged, on or before the date on which the merger becomes effective, shall file for record with the officer of the county in which the city is located having charge and custody of the deed records of the county, certified copies of the written statements of returns of the election in the two cities. The county officers shall enter the statements of returns of record in the deed records of the county.