| Parish | Town | Affiliated School | Nearby School(s) |
| Assumption of the Blessed Virgin Mary | Centereach | ||
| Blessed Sacrament | Valley Stream | ||
| Christ the King | Commack | ||
| Church of St. Elizabeth Ann Seton | Lake Ronkonkoma | ||
| Church of the Good Shepherd | Holbrook | ||
| Church of the Holy Cross | Nesconset | ||
| Church of the Resurrection | Farmingville | ||
| Corpus Christi | Mineola | ||
| Cure of Ars | Merrick | St. Elizabeth Ann Seton Regional | |
| Holy Family | Hicksville | Holy Family School | |
| Holy Name of Jesus | Woodbury | ||
| Holy Name of Mary | Valley Stream | Holy Name of Mary | |
| Holy Spirit | New Hyde Park | ||
| Immaculate Conception | Westhampton Beach | Our Lady Queen of Apostles | |
| Infant Jesus | Port Jefferson | ||
| Lakeview Mission | West Hempstead | ||
| Maria Regina | Seaford | Maria Regina | |
| Mary Immaculate | Bellport | Holy Angels | |
| Most Holy Trinity | East Hampton | ||
| Most Precious Blood Mission | Davis Park | ||
| Notre Dame | New Hyde Park | Notre Dame | |
| Our Holy Redeemer | Freeport | ||
| Our Lady of Fatima | Manorhaven | ||
| Our Lady of Good Counsel | Inwood | ||
| Our Lady of Good Counsel Mission | Cutchogue | ||
| Our Lady of Grace | West Babylon | ||
| Our Lady of Hope | Carle Place | St. Brigid/Our Lady of Hope | |
| Our Lady of Loretto | Hempstead | Affiliated with St. Martin de Porres, Uniondale | |
| Our Lady of Lourdes | Malverne | Our Lady of Lourdes, Malverne | |
| Our Lady of Lourdes | Massapequa Park | ||
| Our Lady of Lourdes | West Islip | ||
| Our Lady of Mercy | Hicksville | ||
| Our Lady of Mount Carmel | Patchogue | Holy Angels | |
| Our Lady of Ostrabrama | Cutchogue | St. John Paul II Regional School – Riverhead | |
| Our Lady of Peace | Lynbrook | Our Lady of Peace | |
| Our Lady of Perpetual Help | Lindenhurst | ||
| Our Lady of Poland | Southampton | Our Lady of the Hamptons | |
| Our Lady of the Assumption | Copiague | ||
| Our Lady of the Isle | Shelter Island Heights | ||
| Our Lady of the Magnificat Mission | Ocean Beach | ||
| Our Lady of the Miraculous Medal | Point Lookout | Long Beach Catholic | |
| Our Lady of the Miraculous Medal | Wyandanch | ||
| Our Lady of the Snow | Blue Point | ||
| Our Lady of Victory | Floral Park | Our Lady of Victory | |
| Our Lady Queen of Martyrs | Centerport | Trinity Regional | |
| Our Lady Star of the Sea Mission | Saltaire | ||
| Queen of Most Holy Rosary | Bridgehampton | ||
| Queen of Most Holy Rosary | Roosevelt | ||
| Sacred Heart | Cutchogue | St. John Paul II Regional School – Riverhead | |
| Sacred Heart | Island Park | ||
| Sacred Heart | North Merrick | ||
| Sacred Hearts of Jesus and Mary Basilica | Southampton | Our Lady of the Hamptons | |
| SS Cyril and Methodius | Deer Park | SS Cyril and Methodius | |
| SS Peter and Paul | Manorville | Our Lady Queen of Apostles | |
| SS Philip and James, St. James | St. James | SS Philip and James, St. James | |
| St. Agnes Cathedral | Rockville Centre | St. Agnes Cathedral | |
| St. Agnes | Greenport | St. John Paul II Regional School – Riverhead | |
| St. Aidan | Williston Park | St. Aidan | |
| St. Aloysius | Great Neck | ||
| St. Andrew | Sag Harbor | ||
| St. Anne | Brentwood | Our Lady of Providence | |
| St. Anne | Garden City | St. Anne | |
| St. Anthony | Oceanside | ||
| St. Anthony of Padua | East Northport | Trinity Regional | |
| St. Anthony of Padua | Rocky Point | ||
| St. Barnabas the Apostle | Bellmore | St. Elizabeth Ann Seton | |
| St. Bernard | Levittown | ||
| St. Boniface | Elmont | ||
| St. Boniface Martyr | Sea Cliff | ||
| St. Brigid | Westbury | St. Brigid/Our Lady of Hope | |
| St. Catherine of Sienna | Franklin Square | ||
| St. Christopher | Baldwin | St. Christopher | |
| St. Dominic | Oyster Bay | St. Dominic Elementary | |
| St. Edward Confessor | Syosset | St. Edward Confessor | |
| St. Elizabeth of Hungary | Melville | Trinity Regional | |
| St. Frances Cabrini | Coram | Holy Angels | |
| St. Frances De Chantal | Wantagh | St. Elizabeth Ann Seton | |
| St. Francis de Sales | Patchogue | Holy Angels | |
| St. Francis of Assisi | Greenlawn | Trinity Regional | |
| St. Gerard Majella | Port Jefferson Station | ||
| St. Gertrude | Bayville | ||
| St. Hedwig | Floral Park | ||
| St. Hugh of Lincoln | Huntington Station | Trinity Regional | |
| St. Hyacinth | Glen Head | ||
| St. Ignatius Loyola | Hicksville | ||
| St. Ignatius Martyr | Long Beach | Long Beach Catholic | |
| St. Isidore | Riverhead | St John Paul II Regional School, Riverhead | |
| St. James | Seaford | ||
| St. James | Setauket | ||
| St. Joachim | Cedarhurst | ||
| St. John Nepomucene | Bohemia | ||
| St. John of God | Central Islip | Our Lady of Providence | |
| St. John the Baptist | Wading River | ||
| St. John the Evangelist | Center Moriches | Our Lady Queen of Apostles | |
| St. John the Evangelist | Riverhead | ||
| St. Joseph | Babylon | ||
| St. Joseph | Garden City | St. Joseph, Garden City | |
| St. Joseph | Hewlett | ||
| St. Joseph | Kings Park | Holy Family Regional | |
| St. Joseph | Ronkonkoma | ||
| St. Joseph the Worker | East Patchogue | Holy Angels | |
| St. Jude | Mastic Beach | Our Lady Queen of Apostles | |
| St. Kilian | Farmingdale | ||
| St. Ladislaus | Hempstead | Affiliated with St. Martin de Porres, Uniondale | |
| St. Lawrence the Martyr | Sayville | ||
| St. Louis de Montfort | Sound Beach | ||
| St. Luke | Brentwood | Our Lady of Providence | |
| St. Margaret of Scotland | Selden | Holy Angels | |
| St. Mark | Shoreham | ||
| St. Martha | Uniondale | Affiliated with St. Martin de Porres, Uniondale | |
| St. Martin of Tours, Amityville | Amityville | St. Martin of Tours, Amityville | |
| St. Martin of Tours, Bethpage | Bethpage | ||
| St. Mary | East Islip | St. Mary School | |
| St. Mary | Manhasset | St. Mary’s Elementary School | |
| St. Mary | Roslyn | ||
| St. Mary of the Isle | Long Beach | Long Beach Catholic | |
| St. Matthew | Dix Hills | Holy Family Regional | |
| St. Patrick | Bay Shore | St. Patrick, Bay Shore | |
| St. Patrick | Glen Cove | ||
| St. Patrick | Huntington | St. Patrick, Huntington | |
| St. Patrick | Smithtown | St. Patrick, Smithtown | |
| St. Patrick | Southold | St. John Paul II Regional School – Riverhead | |
| St. Paul the Apostle | Brookville | ||
| St. Peter of Alcantara | Port Washington | ||
| St. Peter the Apostle | Amagnasett | ||
| St. Peter the Apostle | Islip Terrace | Our Lady of Providence | |
| St. Philip Neri | Northport | Trinity Regional | |
| St. Pius X | Plainview | ||
| St. Raphael | East Meadow | St. Elizabeth Ann Seton | |
| St. Raymond | East Rockaway | St. Raymond | |
| St. Rocco | Glen Cove | ||
| St. Rosalie | Hampton Bays | Our Lady of the Hamptons | |
| St. Rosalie Mission | East Quogue | ||
| St. Rose of Lima | Massapequa | St. Rose of Lima | |
| St. Sylvester | Medford | Holy Angels | |
| St. Therese of Lisieux | Montauk | ||
| St. Thomas More | Hauppauge | ||
| St. Thomas the Apostle | West Hempstead | St. Thomas the Apostle | |
| St. Vincent De Paul | Elmont | ||
| St. William the Abbot | Seaford | St. William the Abbot |
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