Roman Catholic Diocese of Mexicali Tags: Clerical Administrative Region, Diocese.The Roman Catholic Diocese of Mexicali (Latin: Dioecesis Mexicalensis) (erected 25 March 1966) is a suffragan diocese of the Archdiocese of Tijuana. It was a suffragan of the Archdiocese of Hermosillo until 25 November 2006. thumbnail area (km2) 5.90206e+10 Established 25 March 1966 ( years ago) province Roman Catholic Archdiocese of Tijuana Learn more... Loading...