| Diocese | London |
| City | Parish (Catholic Population of the Parish) |
| Chatham | St. Anthony of Padua (20) |
| Sarnia | Our Lady of Sorrows (25) |
| Windsor | St. Anthony of Padua (25) |
| Windsor | St. Casimir (35) |
| Delhi | St. Casimir (60) |
| London | Our Lady of Siluva (105) |
| Windsor | Sts. Cyril and Methodius (275) |
| Ashfield | St. Joseph (340) |
| Woodstock | Holy Cross (495) |
| London | St. Stephen of Hungary (550) |
| Chatham | Our Lady of Victory (800) |
| London | St. Leopolo Mandic (800) |
| Grand Bend | Immaculate Heart of Mary (1300) |
| Windsor | Immaculate Heart (2000) |
| Windsor | Holy Trinity (3500) |
| London | Holy Cross (2500) |