Oregon Revised Statutes Remedies and Special Actions and Proceedings § 36.464

(a) The county where the arbitration agreement is to be performed or was made.

(b) If the arbitration agreement does not specify a county where the agreement is to be performed and the agreement was not made in any county in the State of Oregon, the county where any party to the court proceeding resides or has a place of business.

(c) In any case not covered by paragraph (a) or (b) of this subsection, in any county in the State of Oregon.