| Bishop (2018.05.09 – ...): |  Bishop Daniel Oca Presto (62) |
Cities (Ilocos)  | Churches (28) |
| Agoo |  Our Lady of Charity (Minor Basilica, Shrine, Parish)  Parish of Santa Monica |
| Aringay |  St. Lucy (Parish) |
| Bacnotan | St. Michael of Archangel (Parish) |
| Bagulin | St. Joseph (Parish) |
| Balaoan | St. Nicholas of Tolentino (Parish) |
| Bangar | St. Christopher (Parish) |
| Bauang | Sts. Peter and Paul (Parish) |
| Burgos | Our Lady of Fatima (Parish) |
| Caba | St. John the Baptist (Parish) |
| Corro-Oy | St. Isidore the Farmer (Parish) |
| Damortis | Our Lady of Lourdes (Parish) |
| Luna |  St. Catherine of Alexandria (Parish, Shrine) Shrine of Our Lady of Namacpacan |
| Naguilian | St. Augustine the Hippo (Parish) |
| Napaset | Holy Cross (Parish) |
| Pagdalagan | Our Lady of Perpetual Help (Parish) |
| Pugo | Holy Family (Parish) |
| Quirino | St. Joseph the Worker (Parish) |
| Rosario | Immaculate Conception (Parish) |
| San Fernando |  St. William the Hermit (Cathedral, Parish) |
| San Fernando | Our Lady of Immaculate Concepcion (Parish) |
| San Fernando | St. Jude Thaddeus (Parish) |
| San Gabriel | St. Gabriel the Archangel (Parish) |
| San Juan | St. John the Baptist (Parish) |
| Santiago | St. Joseph the Worker (Parish) |
| Santo Tomas | Holy Guardian Angels (Parish, Shrine) Diocesan Shrine of Nuestra Señora Virgen del Mar Cautiva |
| Santol | Our Lady of Victory (Parish) |
| Sudipen | Holy Family (Parish) |
| Tubao | St. Isidore the Farmer (Parish) |
Last updated on 2026.03.26
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