Comprises the western part of the state of Montana, embracing the following counties: Lewis and Clark, Teton, Flathead, Lincoln, Missoula, Sanders, Powell, Granite, Ravalli, Deer Lodge, Silver Bow, Jefferson, Broadwater, Gallatin, Madison, Lake, and Beaverhead counties plus parts of Meagher, Musselshell, and Toole counties. Erected on March 5, 1883 as a suffragan of the archdiocese of Oregon City, Oregon. Suffragan of the archdiocese of Portland, Oregon. See also