The Supreme Court is the state's highest court and serves as the final rule-making body for all other state courts. The court publishes opinions; sets precedents for subsequent cases decided in Washington; has original jurisdiction of petitions against state officers; reviews key trial court decisions; and provides continuing guidance for the judiciary. In addition, the Supreme Court has administrative responsibility for the state court system and supervisory responsibility over certain activities of the Washington State Bar Association, including attorney disciplinary matters.

The Supreme Court, pursuant to Article IV, Section 4 of the Washington State Constitution and Chapter 2.04 RCW, is the state's "court of last resort" and is responsible for administering the judicial branch of state government. The court's mission remains one of providing an independent, accessible, and responsive forum for the just resolution of disputes.