|
County |
Dioceses to 1858 |
| Antrim | Connor, Derry, Down, Dromore |
| Armagh | Armagh, Dromore |
| Carlow | Leighlin |
| Cavan | Ardagh, Kilmore, Meath |
| Clare | Killaloe & Kilfenora, Limerick |
| Cork | Ardfert & Aghadoe, Cloyne, Cork & Ross |
| Donegal | Clogher, Derry, Raphoe |
| Down | Connor, Down, Dromore, Newry & Mourne |
| Dublin | Dublin |
| Fermanagh | Clogher, Kilmore |
| Galway | Clonfert, Elphin, Killaloe & Kilfenora, Tuam |
| Kerry | Ardfert & Aghadoe |
| Kildare | Dublin, Kildare |
| Kilkenny | Leighlin, Ossory |
| Kings (Offaly) | Clonfert, Kildare, Killaloe & Kilfenora, Meath, Ossory |
| Leitrim | Ardagh, Kilmore |
| Limerick | Cashel & Emly, Killaloe & Kilfenora, Limerick |
| Londonderry | Armagh, Connor, Derry |
| Longford | Armagh, Kilmore, Meath |
| Louth | Armagh, Clogher, Drogheda |
| Mayo | Killala & Achonry, Tuam |
| Meath | Armagh, Kildare, Meath |
| Monaghan | Clogher |
| Queens (Leix) | Dublin, Kildare, Leighlin, Ossory |
| Roscommon | Clonfert, Elphin, Tuam |
| Sligo | Ardagh, Elphin, Killala & Achonry |
| Tipperary | Cashel & Emly, Killaloe & Kilfenora, Waterford & Lismore |
| Tyrone | Armagh, Clogher, Derry |
| Waterford | Waterford & Lismore, Lismore Peculiar |
| Westmeath | Ardagh, Meath |
| Wexford | Dublin, Ferns |
| Wicklow | Dublin, Ferns, Leighlin |