Cities (Ilocos)  | Churches (45) |
| Alangan | Christ of the Desert (Monastery)  |
| Alangan | St. Louis  |
| Alilem | Our Lady of Lourdes (Parish)  |
| Ayusan Sur | Immaculate Conception (Seminary)  |
| Banayoyo | Our Lady of Lourdes (Parish)  |
| Bantay | St. Augustine (Parish, Shrine)  Shrine of Nuestra Señora de Caridad |
| Burgos | Most Holy Name of Jesus (Parish)  |
| Cabugao | St. Mark the Evangelist (Parish)  |
| Candon | St. John of Sahagun (Parish)  |
| Caoayan | Our Lady of Hope (Parish)  |
| Cervantes | Holy Child of Prague (Parish)  |
| Del Pilar | Our Lady of Lourdes (Parish)  |
| Galimuyod | Sacred Heart of Jesus (Parish)  |
| Lidlidda | Our Lady of Fatima (Parish)  |
| Lungog | St. Francis Xavier (Parish)  |
| Magsingal | St. William the Hermit (Parish)  |
| Nagbukel | St. Joseph (Parish)  |
| Narvacan | St. Lucy (Parish)  |
| Paing | Christ the King (Parish)  |
| Puro | St. Lorenzo Ruiz (Parish)  |
| Quirino | Immaculate Conception (Parish)  |
| Santa Catalina | St. Catherine of Alexandria (Parish)  |
| Santa Cruz | Immaculate Conception (Parish)  |
| Santa Cruz | St. Joseph the Worker (Parish)  |
| San Emilio | St. Michael the Archangel (Parish)  |
| San Esteban | St. Stephen Protomartyr (Parish)  |
| San Ildefonso | St. Ildephonse (Parish)  |
| San Isidro | St. Isidore the Farmer (Parish)  |
| San Juan | St. John the Baptist (Parish)  |
| Santa Lucia | St. Lucy (Parish, Shrine)  |
| Santa Maria | Our Lady of the Assumption (Pro-Cathedral, Minor Basilica, Diocesan Shrine, World Heritage Site, Parish)  |
| San Vicente | St. Vincent Ferrer (Parish)  |
| Salcedo | St. Joseph (Parish)  |
| Santa | St. Catherine of Alexandria (Parish)  |
| Santiago | St. James the Greater (Parish)  |
| Santo Domingo | St. Dominic of Guzman (Parish)  |
| Sevilla | Our Lady of Guadalupe (Parish)  |
| Sigay | St. Joseph the Worker (Parish)  |
| Sinait | St. Nicolas of Tolentino (Minor Basilica, Shrine, Parish)  Archdiocesan Shrine of El Santo Cristo Milagroso |
| Sinait | Santo Cristo Milagroso  |
| Sugpon | St. Anthony of Padua (Parish)  |
| Suyo | St. Andrew the Apostle (Parish)  |
| Tagudin | Conversion of St. Augustine (Parish)  |
| Talogtog | Our Lady Help of Christians (Parish)  |
| Vigan City | Conversion of St. Paul the Apostle (Cathedral, World Heritage Site, Parish)  |