The diocese is bounded by the South Australian border (the Archdiocese of Adelaide and the Diocese of Port Pirie), the Murray River (the Diocese of Wilcannia-Forbes) and the Southern Ocean. To the east is the Diocese of Sandhurst and the Archdiocese of Melbourne. The diocese has 52 parishes, 39 clergy and four parish leaders. The seat of the diocese is St Patrick's Cathedral, Ballarat.
