The circuit court is a division of the Oregon Judicial Department. The Oregon Judicial Department is the third branch of Oregon's state government by Article III, Section 1, Oregon Constitution. Since 1983, all funding of the Oregon Judicial Department, including the circuit court's, has been the obligation of the state, except for the funding of circuit court facilities. ORS 1.001. Circuit court facility funding is an obligation of county government. ORS 1.185.
The circuit court is a court of general jurisdiction. By statute, ORS 3.136, the circuit court is the municipal court for the City of Portland. The circuit court also serves as the municipal court for the City of Gresham and other municipal governments in Multnomah County, with the exceptions of the City of Troutdale and the City of Fairview.