- Historic Sites
Diocese Of Helena
The Vicariate Apostolate of Nebraska was erected for Montana east of the Cascade Mountains and Wyoming, 1857-1884, and the Vicariate Apostolate of Idaho and Montana was erected for Idaho south of the 46th parallel and Montana west of the Cascade Mountains, 1858-1868. In 1868, the Vicariate Apostolate of Idaho and Montana was expanded to include all of Idaho and in 1884, the Diocese of Helena was erected to included all of present-day Montana. In 1900, the Helena Diocese reported 9,000 baptized Native American Catholics and in 1999 the dioceses of Helena and Great Falls- Billings reported 7,000 and 12,000 respectively.