T
- (Wicklow) Thomastown
- (Wexford) Tomathone Lower
- (Wicklow) Templerainy
- (Wicklow) Templemichael
- (Wexford) Tombay
- (Wicklow) Tobertownagh
- (Wexford) Tinnock Upper
- (Wexford) Tinnashinnagh
- (Wicklow) Three Bridges
- (County Carlow) Tinnaclash
- (Wicklow) Tombreen
- (Wicklow) Tomnafinnoge
- (Kildare) Tipper
- (Kilkenny) Turkstown
- (Wexford) Tullycanna
- (Kilkenny) Tullaroan
- (Kilkenny) Tullaghought
- (Kilkenny) Tullagher
- (Meath) Tullaghanoge
- (Wexford) Tomhaggard
- (Wexford) Tombrack
- (Wexford) Tomacurry
- (Laois) The Togher
- (Louth) Togher
- (Wicklow) Togher
- (Uíbh Fhailí) Tober
- (County Carlow) Tinnahinch
- (Wexford) Tinnaglogh
- (Meath) Tinkerslane
- (Kildare) Timolin