Oregon Revised Statutes Counties and County Officers § 202.190

All moneys due from the State of Oregon to a new county shall be paid to the county treasurer of the new county in the manner and at the same time that such moneys are paid to the other counties of the state. All moneys due from the state to a county from which any territory is taken by reason of change in the boundaries thereof shall be paid to the treasurer of the two counties affected in proportion to the change in the territory affected by the change in boundaries.