| Cities (New York) | Churches (137) |
| Centereach |  Assumption of the Blessed Virgin Mary |
| Valley Stream | Blessed Sacrament |
| Commack | Christ the King |
| Mineola | Corpus Christi (English, Spanish, Portuguese) |
| Merrick | Cure of Ars |
| Holbrook | Good Shepherd |
| Nesconset | Holy Cross |
| Hicksville | Holy Family |
| Woodbury | Holy Name of Jesus (English, Korean) |
| Valley Stream | Holy Name of Mary |
| New Hyde Park | Holy Spirit |
| East Hampton | Holy Trinity |
| Huntington |  Immaculate Conception (Seminary) |
| Westhampton Beach | Immaculate Conception |
| Port Jefferson | Infant Jesus |
| Seaford | Maria Regina |
| Bellport | Mary Immaculate |
| New Hyde Park | Notre Dame |
| Freeport | Our Holy Redeemer (English, Spanish) |
| Manorhaven | Our Lady of Fatima |
| Inwood | Our Lady of Good Counsel |
| West Babylon | Our Lady of Grace |
| Carle Place | Our Lady of Hope |
| Hempstead | Our Lady of Loretto (English, Spanish) |
| Malverne | Our Lady of Lourdes |
| Massapequa Park | Our Lady of Lourdes |
| West Islip | Our Lady of Lourdes |
| Hicksville | Our Lady of Mercy |
| Patchogue | Our Lady of Mount Carmel |
| Cutchogue | Our Lady of Ostrabrama |
| Lynbrook | Our Lady of Peace |
| Lindenhurst | Our Lady of Perpetual Help |
| Copiague | Our Lady of the Assumption (English, Polish) |
| Eastport |  Our Lady of the Island (Shrine) |
| Shelter Island Heights | Our Lady of the Isle |
| Ocean Beach | Our Lady of the Magnificat |
| Point Lookout | Our Lady of the Miraculous Medal |
| Wyandanch | Our Lady of the Miraculous Medal (English, Spanish) |
| Blue Point | Our Lady of the Snow |
| Floral Park | Our Lady of Victory |
| Centerport | Our Lady Queen of Martyrs |
| Davis Park | Precious Blood |
| Bridgehampton | Queen of the Most Holy Rosary |
| Roosevelt | Queen of the Most Holy Rosary |
| Farmingville | Resurrection |
| Cutchogue | Sacred Heart |
| Island Park | Sacred Heart |
| North Merrick | Sacred Heart |
| Southampton |  Sacred Hearts of Jesus and Mary (Minor Basilica, Parish) |
| Rockville Centre |  St. Agnes (Cathedral) |
| Greenport | St. Agnes |
| Williston Park | St. Aidan |
| Great Neck | St. Aloysius (English, Korean) |
| Sag Harbor | St. Andrew |
| Brentwood | St. Anne (Spanish) |
| Garden City | St. Anne |
| Oceanside | St. Anthony |
| East Northport | St. Anthony of Padua |
| Rocky Point | St. Anthony of Padua |
| Bellmore | St. Barnabas the Apostle |
| Levittown | St. Bernard |
| Elmont | St. Boniface |
| Sea Cliff | St. Boniface Martyr |
| Westbury | St. Brigid (English, Spanish, Italian) |
| Franklin Square | St. Catherine of Siena |
| Baldwin | St. Christopher |
| Deer Park | Sts. Cyril and Methodius |
| Oyster Bay | St. Dominic |
| Syosset | St. Edward the Confessor |
| Lake Ronkonkoma | St. Elizabeth Ann Seton |
| Melville | St. Elizabeth of Hungary |
| Coram | St. Frances Cabrini |
| Wantagh | St. Frances de Chantal |
| Patchogue | St. Francis de Sales |
| Greenlawn | St. Francis of Assisi |
| Port Jefferson Station | St. Gerard Majella |
| Bayville | St. Gertrude |
| Floral Park | St. Hedwig (English, Polish) |
| Huntington Station | St. Hugh of Lincoln |
| Glen Head | St. Hyacinth |
| Hicksville | St. Ignatius Loyola |
| Long Beach | St. Ignatius Martyr |
| Riverhead | St. Isidore |
| Seaford | St. James |
| Setauket | St. James |
| Cedarhurst | St. Joachim |
| Bohemia | St. John Nepomucene |
| Central Islip | St. John of God (English, Spanish) |
| Wading River | St. John the Baptist |
| Center Moriches | St. John the Evangelist |
| Riverhead | St. John the Evangelist |
| Babylon | St. Joseph |
| Garden City | St. Joseph |
| Hewlett | St. Joseph |
| Kings Park | St. Joseph |
| Ronkonkoma | St. Joseph |
| East Patchogue | St. Joseph the Worker |
| Mastic Beach | St. Jude |
| Farmingdale | St. Kilian |
| Hempstead | St. Ladislaus (English, Polish) |
| Sayville | St. Lawrence the Martyr |
| Sound Beach | St. Louis de Montfort |
| Brentwood | St. Luke (Spanish) |
| Selden | St. Margaret of Scotland |
| Shoreham | St. Mark |
| Uniondale | St. Martha |
| Amityville | St. Martin of Tours |
| Bethpage | St. Martin of Tours |
| East Islip | St. Mary |
| Manhasset | St. Mary |
| Roslyn | St. Mary |
| Long Beach | St. Mary of the Isle (English, Spanish) |
| Dix Hills | St. Matthew |
| Bay Shore | St. Patrick |
| Glen Cove | St. Patrick |
| Huntington | St. Patrick |
| Smithtown | St. Patrick |
| Southold | St. Patrick |
| Brookville | St. Paul the Apostle |
| Amagansett | St. Peter |
| Manorville | Sts. Peter and Paul |
| Port Washington | St. Peter of Alcantara |
| Islip Terrace | St. Peter the Apostle |
| St. James | Sts. Philip and James |
| Northport | St. Philip Neri |
| Plainview | St. Pius X |
| East Meadow | St. Raphael |
| East Rockaway | St. Raymond of Penyafort |
| Glen Cove | St. Rocco |
| Hampton Bays | St. Rosalie |
| Massapequa | St. Rose of Lima |
| Medford | St. Sylvester |
| Montauk | St. Therese of Lisieux |
| Hauppauge | St. Thomas More |
| West Hempstead | St. Thomas the Apostle |
| Elmont | St. Vincent de Paul |
| Seaford | St. William the Abbot |
| Cities | Other Churches Within the Diocesan Territory (8) |
| Lindenhurst |  Holy Family (Ukrainian) |
| Smithtown | Resurrection (Ruthenian) |
| Westbury | St. Andrew the Apostle (Ruthenian) |
| Riverhead | St. John the Baptist (Ukrainian) |
| Glen Cove | St. Josaphat (Monastery) (Ukrainian) |
| West Hempstead | St. Mary (Syro-Malabar) |
| Elmont |  St. Vincent de Paul (Cathedral) (Syro-Malankara) |
| Hempstead | St. Vladimir (Ukrainian) |
Bishop John OliverBarres (65)
