Seat of the Roman Catholic Diocese of Surabaya, established on 15 February 1928 as the Apostolic Prefecture of Surabaya from the Apostolic Vicariate of Batavia, promoted on 16 October 1941 as Apostolic Vicariate of Surabaya, promoted on 3 January 1961 as the Diocese of Surabaya, and renamed as such 22 August 1973. The local area apparently includes 150,457 (4.4%) Catholics.