| Diocese | Thunder Bay |
| City | Parish (Catholic Population of the Parish) |
| Baird | St. Augustine (51) |
| Heron Bay | St. Francis Xavier (73) |
| Kakabeka Falls | St. Theresa (100) |
| Thunder Bay | French Community (100) |
| Vermilion Bay | Our Lady of Fatima (104) |
| Thunder Bay | Assumption of Blessed Virgin Mary (140) |
| Ear Falls | St. Theresa (145) |
| Armstong | Our Lady of the Snows (150) |
| Beadmore | St. Theresa (178) |
| Balmertown | St. Francis Xavier (200) |
| Thunder Bay | St. Casimir (210) |
| Thunder Bay | Our Lady Queen of Poland (230) |
| Terrace Bay | St. Martin of Tours (260) |
| Thunder Bay | Kitchitwa Kateri (500) |