The diocese was established on 19 December 1905, as the
Apostolic Prefecture (missionary jurisdiction) of Caroline Islands, uniting the
Mission sui iuris of Eastern Carolines and
Mission sui iuris of Western Carolines, both of which had been split from the
Apostolic Prefecture of Micronesia in 1886. It became the
Apostolic Vicariate (higher missionary stage jurisdiction, entitled to a
titular bishop) of Marianne and Caroline Islands on 1 March 1911. It grew to become the
Apostolic Vicariate of
Marianne, Caroline and Marshall Islands on 4 May 1923. It changed its name to become the Apostolic Vicariate of
Caroline and Marshall Islands on 4 July 1946. It was elevated to become the
diocese Carolines-Marshalls by promotion on 3 May 1979. The diocese was split on 23 April 1993 by
Pope John Paul II, resulting in the creation of the present-day Diocese of Caroline Islands and the
Apostolic Prefecture of the Marshall Islands. ==Demographics==