| Bishop (2012.10.12 – ...): |  Bishop Renato Pine Mayugba (70) |
Cities (Ilocos)  | Churches (31) |
| Bacarra |  St. Andrew the Apostle (Parish)  |
| Badoc |  San Juan Bautista (Minor Basilica, Shrine, Parish) Shrine of La Virgen Milagrosa de Badoc |
| Balatong | Our Lady of Lourdes (Parish) |
| Balatong |  Santa Clara (Monastery) Monastery of St. Clare |
| Bangui | St. Lawrence the Deacon (Parish) |
| Banna | St. Roche (Parish) |
| Baresbes | St. John Bosco (Parish) |
| Batac | Immaculate Conception (Parish) |
| Burgos | St. John Sahagun (Parish) |
| Cadaratan | Our Lady of Fatima (Parish) |
| Carasi | St. Joseph the Worker (Parish) |
| Curiimao | St. Michael the Archangel (Parish) |
| Davila | St. Francis of Assisi (Parish) |
| Dingras | St. Joseph (Parish) |
| Laoag City |  St. William the Hermit (Cathedral, Parish) |
| Laoag City | Divine Mercy (Parish) |
| Laoag City | St. Joseph (Parish) |
| Marcos | St. Anthony of Padua (Parish) |
| Nueva Era | St. Gabriel the Archangel (Parish) |
| Pagudpud | St. Jude Thaddeus (Parish, Shrine) |
| Pancian | Our Mother of Perpetual Help (Parish) |
| Paoay | San Agustin (World Heritage Site) |
| Paoay | San Roque (Shrine) |
| Pasuquin | St. James the Greater (Parish) |
| Piddig | St. Anne (Parish) |
| Pinili | St. Isidore the Farmer (Parish) |
| San Nicolas | St. Nicholas de Tolentino (Parish, Shrine) |
| Santa Rosa | St. Rose of Lima (Parish) |
| Sarrat | Santa Monica (Parish) |
| Solsona | St. James the Greater (Parish) |
| Vintar | St. Nicholas de Tolentino (Parish) |
Last updated on 2025.12.22
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