Oregon Revised Statutes Counties and County Officers § 202.310

In all actions or proceedings, civil or criminal, for the prosecution of a crime committed or a cause of action arising within the boundaries of any judicial subdivision created under the provisions of this chapter, and properly triable in such subdivision under the provisions of the civil and criminal procedure statutes, the venue thereof shall be changed to the new county or to the county to which the territory has been added by the change in boundaries, by order of the court of the judicial district upon payment upon the demand of either party. The demand shall be served upon the opposite party or the attorney of the opposite party, if either can be found in the state, but if neither can be found therein then the change of venue may be made upon filing the demand with the court clerk or court administrator and such change of venue shall have effect in the manner provided by law for the change of venue.