Roman Catholic Diocese of Incheon Tags: Clerical Administrative Region, Diocese.The Roman Catholic Diocese of Incheon (Latin: Dioecesis Inchonensis) is a diocese of the Latin Rite of the Catholic Church located in Incheon South Korea. The diocese is suffragan to the Archdiocese of Seoul. thumbnail area (km2) 1.282e+09 country South Korea Established 6 June 1961 ( years ago) jurisdiction Diocese province Roman Catholic Archdiocese of Seoul Learn more... Loading...