Oregon Revised Statutes Elections § 258.036

(a) The Circuit Court for Marion County if the petition involves a state measure, a candidate for election to the office of elector of President and Vice President of the United States or a candidate for nomination or election to the office of United States Senator, United States Representative in Congress, Governor, Secretary of State, State Treasurer, Attorney General, Commissioner of the Bureau of Labor and Industries or a position of judge on the Oregon Supreme Court, the Oregon Court of Appeals or the Oregon Tax Court.

(b) The circuit court for the county where a majority of the electors in the electoral district reside if the petition involves a candidate for nomination or election to the office of state Senator, state Representative, circuit court judge or district attorney.

(c) The circuit court for the county in which the filing officer is located if the petition involves a candidate for nomination or election to county, city or district office or a county, city or district measure. If a district is located in more than one county, the petition shall be filed with the circuit court for the county in which the administrative office of the district is located.

(d) The circuit court for the county in which the filing officer authorized to order the recall election is located if the petition involves the recall of a public officer.

(a) The cause of the contest; and

(b) The names of all contestees.