Roman Catholic Diocese of Matamoros Tags: Clerical Administrative Region, Diocese.The Diocese of Matamoros (Latin: Dioecesis Matamorensis) is a Roman Catholic diocese sufragan to the Archdiocese of Monterrey. It is located in the northeast part of the state of Tamaulipas along the border with Texas. thumbnail area (km2) 1.94638e+10 Established 16 February 1958 ( years ago) jurisdiction Diocese province Roman Catholic Archdiocese of Monterrey Learn more... Loading...