United States Court of Appeals for the Ninth Circuit | 17,603 followers on LinkedIn. Headquartered in San Francisco, California, the United States Court of Appeals for the Ninth Circuit is the nation's busiest federal appellate court. Judicial districts within the Ninth Circuit include the districts of Alaska, Arizona, Central California, Eastern California, Northern California, Southern California, Hawaii, Idaho, Montana, Nevada, Oregon, Eastern Washington, Western Washington, the U.S. Territory of Guam and the Commonwealth of the Northern Mariana Islands.