This page features a list of over 1,300 record parishes from the Roman Catholic Parishes index of 1836.
| Parish | Posttown | County |
|---|---|---|
| Tongmacon | Aughrim | Galway |
| Toomavara | Nenagh | Tipperary |
| Toomavara | Nenagh | Tipperary |
| Toomore | Foxford | Mayo |
| Tralee | Tralee | Kerry |
| Tralee | Tralee | Kerry |
| Tramore | Tramore | Waterford |
| Tramore | Tramore | Waterford |
| Trim | Trim | Meath |
| Trim | Trim | Meath |
| Trinity | Rosscomm | Roscommon |
| Trinity Within & St. John's | Waterford | Waterford |
| Trinity Within & St. John's | Waterford | Waterford |
| Trinity Within & St. John's | Waterford | Waterford |
| Trinity Within & St. John's | Waterford | Waterford |
| Trinity Without or Ballybrick | Waterford | Waterford |
| Trinity Without or Ballybrick | Waterford | Waterford |
| Tuam | Tuam | Galway |
| Tuam | Tuam | Galway |
| Tuam | Tuam | Galway |
| Tuhaclay | Ennistymon | Clare |
| Tuharrin | Ennistymon | Clare |
| Tulalbilagh | Dunfanaghy | Donegal |
| Tulla | Tulla | Clare |
| Tulla | Tulla | Clare |
| Tullamore | Tullamore | Offaly |
| Tullamore | Tullamore | Offaly |
| Tullyallen | Drogheda | Louth |
| Tullyaugh. | Ramelton | Donegal |
| Tullycorbet | Ballibay | Monaghan |
| Tullylish | Banbridge | Down |
| Turbetst. | Mullingar | Westmeath |
| Turin | Mullingar | Westmeath |
| Turlough | Castlebar | Mayo |
| Turlough | Castlebar | Mayo |
| Tydavnit | Monaghan | Monaghan |
| Tyhollena | Monaghan | Monaghan |
| Tynagh | Loughrea | Galway |
| Tynan | Tynan | Armagh |
| U.Glanmir. | U. Glanmir. | Cork |
| Up Woods | Up Woods | Laois |
| Up Woods | Up Woods | Laois |
| Up. Church | Borrisoleih. | Tipperary |
| Upper Dromgl. | Castlewellan | Down |
| Urlingford | Kilkenny | Kilkenny |
| Urlingford | Kilkenny | Kilkenny |
| Urney | Feeney | Derry |
| Urney | Strabane | Tyrone |
| Urney & Anegeliff | Cavan | Cavan |
| Urney & Anegeliff | Cavan | Cavan |
| Valentia | Valentia | Kerry |
| W. Tulog | - | Donegal |
| Waterg.hill | Rathcorm. | Cork |
| Westport | Westport | Mayo |
| Westport | Westport | Mayo |
| Wexford | Wexford | Wexford |
| Wexford | Wexford | Wexford |
| Wicklow | Wicklow | Wicklow |
| Windgap | CarrickonS. | Tipperary |
| Woodford | Loughrea | Galway |
| Youghal | Youghal | Cork |
| Youghal | Youghal | Cork |