Oregon Revised Statutes Human Services; Juvenile Code; Corrections § 419B.118

(1) Subject to the provisions of subsections (2), (3) and (4) of this section, a juvenile court proceeding shall commence in the county of wardship if, at the commencement of the proceeding, wardship exists as a result of proceedings under this chapter, or, in the absence of such wardship, in the county where the child resides.

(2) If the proceeding is based on allegations of jurisdiction under ORS 419B.100 (1)(a), (b) or (c), the proceeding may also commence in the county in which the alleged act or behavior took place.

(3) If the proceeding is based on allegations of jurisdiction under ORS 419B.100 (1)(b), (c), (d), (e) or (f), the proceedings may also commence in the county where the child is present when the proceeding begins.

(4) A termination of parent-child relationship proceeding may be commenced in the county of wardship or where the child or ward resides or is found unless the child is an Indian child subject to the Indian Child Welfare Act   1 and the tribal court has assumed jurisdiction.