Diocese of Sioux City Information

The Diocese of Sioux City was established by a decree of His Holiness, Pope Leo XIII, on Jan. 15, 1902, by the separation of 24 counties in northwest Iowa from the territory of the Archdiocese of Dubuque. The Diocese of Sioux City belongs to the ecclesiastical Province of Iowa with Dubuque as the See City of the Archdiocese and with sister dioceses in Davenport and Des Moines. Each of these jurisdictions is a ‘particular’ or ‘local’ Church which, through its Ordinary, or bishop, who is appointed by the Holy Father, is united to the universal Catholic Church of which Pope Benedict XVI is the head. On Nov. 10, 2005, it was announced that Pope Benedict XVI had appointed Msgr. R. Walker Nickless of Denver as the seventh bishop of the diocese. His episcopal ordination was held on Jan. 20, 2006 at Nativity of Our Lord Jesus Christ Church in Sioux City.