| Diocese | Hamilton |
| City | Parish (Catholic Population of the Parish) |
| Burlington | St. Adalbert (97) |
| Linwood | St. Mary (299) |
| Hamilton | Our Lady of Mercy (306) |
| Hamilton | Our Lady of Vietnam (315) |
| Hamilton | St. Stepen (750) |
| Hamilton | St. Peter Yu (839) |
| Hamilton | St. Boniface (850) |
| Rockwood | Sacred Heart (880) |
| Hamilton | St. Charles (997) |
| Erin | St. John de Brebeuf (1020) |
| Hamilton | St. Gregory (1100) |
| Hamilton | St. Lawrence (1200) |
| Oakville | St. Joseph (1200) |
| St. Clement | St. Clement (1240) |
| Kitchener | Mission of Our Lady of Guadalupe (1276) |
| Kitchener | Holy Family (1530) |
| Oakville | Holy Trinity (1890) |
| Norval | Queen of Peace Franciscan Centre (2920) |
| Hamilton | St. Joseph (3182) |
| Hamilton | St. Stanislaus (8230) |
| Hamilton | St. Mary (10000) |