| Cities (Indiana) | Churches (74)  |
| Hammond | All Saints (English, Spanish)  |
| San Pierre | All Saints  |
| New Chicago | Assumption of the Blessed Virgin Mary  |
| Munster | Carmelite Monastery (Shrine) (English, Latin, Polish)  |
| St. John | Christ’s Passion (Shrine)  |
| Gary | Holy Angels (Cathedral)  |
| Hamlet | Holy Cross  |
| Cedar Lake | Holy Name of Jesus  |
| Gary | Holy Rosary  |
| Crown Point | Holy Spirit  |
| East Chicago | Holy Trinity (Croatian)  |
| East Chicago | Holy Trinity (Hungarian)  |
| Whiting | Immaculate Conception  |
| Portage | Nativity of Our Savior  |
| Michigan City | Notre Dame  |
| Merrillville | Our Lady of Consolation  |
| Highland | Our Lady of Grace  |
| East Chicago | Our Lady of Guadalupe (Spanish)  |
| Hammond | Our Lady of Perpetual Help  |
| Valparaiso | Our Lady of Sorrows  |
| Michigan City | Queen of All Saints  |
| East Chicago | Sacred Heart  |
| LaPorte | Sacred Heart  |
| Michigan City | Sacred Heart  |
| Wanatah | Sacred Heart  |
| Whiting | Sacred Heart (English, Spanish)  |
| Whiting | St. Adalbert (English, Polish)  |
| Merrillville | St. Andrew the Apostle  |
| Gary | St. Ann  |
| Beverly Shores | St. Ann of the Dunes (English, Lithuanian)  |
| Fish Lake | St. Anthony of Padua  |
| Hobart | St. Bridget  |
| Hammond | St. Casimir (English, Polish, Spanish)  |
| North Judson | Sts. Cyril and Methodius  |
| Koontz Lake | St. Dominic  |
| Lowell | St. Edward (English, Spanish)  |
| Valparaiso | St. Elizabeth Ann Seton  |
| Lake Station | St. Francis Xavier (English, Spanish)  |
| Gary | St. Hedwig (English, Polish)  |
| Hebron | St. Helen  |
| Highland | St. James the Less  |
| Merrillville | St. Joan of Arc  |
| Hammond | St. John Bosco  |
| Rolling Prairie | St. John Kanty  |
| Whiting | St. John the Baptist  |
| St. John | St. John the Evangelist (Parish)  |
| Dyer | St. Joseph  |
| Hammond | St. Joseph  |
| LaPorte | St. Joseph (English, Spanish)  |
| Gary | St. Joseph the Worker (Croatian, English)  |
| Hammond | St. Margaret Mary (English, Spanish)  |
| Dyer | St. Maria Goretti  |
| Gary | St. Mark (English, Spanish)  |
| LaCrosse | St. Martin of Tours  |
| Crown Point | St. Mary  |
| East Chicago | St. Mary (English, Spanish)  |
| Griffith | St. Mary  |
| Kouts | St. Mary  |
| Otis | St. Mary  |
| Gary | St. Mary of the Lake  |
| Michigan City | St. Mary the Immaculate Conception  |
| Crown Point | St. Matthias  |
| Schererville | St. Michael the Archangel  |
| Gary | Sts. Monica and Luke  |
| Chesterton | St. Patrick  |
| East Chicago | St. Patrick (English, Spanish)  |
| Valparaiso | St. Paul (English, Spanish)  |
| LaPorte | St. Peter  |
| Merrillville | Sts. Peter and Paul  |
| East Chicago | St. Stanislaus  |
| Michigan City | St. Stanislaus Kostka (English, Latin)  |
| Merrillville | St. Stephen, Martyr  |
| Knox | St. Thomas Aquinas  |
| Munster | St. Thomas More  |
| Cities | Other Churches Within the Diocesan Territory (6)  |
| Munster | St. Josaphat (Ukrainian)  |
| Whiting | St. Mary (Ruthenian)  |
| Merrillville | St. Michael (Ruthenian)  |
| Hammond | St. Michael the Archangel (Greek-Melkite)  |
| East Chicago | St. Nicholas (Romanian)  |
| Munster | St. Nicholas (Ruthenian)  |