Diocese of Boise City, Idaho Sep 192009 Founded 3 March 1868 by Pope Blessed Pius IX as the Vicariate Apostolic of Idaho and Montana Elevated 25 August 1893 by Pope Leo XIII to the Diocese of Boise City Suffragan of Archdiocese of Portland, Oregon Bishop Additional Information Catholic-Hierarchy.Org Catholic Idaho Google Map MLA Citation “Diocese of Boise City, Idado”. Gazetteer of the Faith. Saints.SQPN.com. 20 June 2012. Web. 23 May 2013. <http://saints.sqpn.com/diocese-of-boise-city-idaho/>