| Code | Name | Region |
|---|---|---|
| IEWHO | White's Cross | CO |
| IEWTN | Whitestown | D |
| IEWIC | Wicklow | |
| IEWIL | Wilton | CO |
| IEYOU | Youghal | |
| IEITM | Tuam | G |
| IETUB | Tubbercurry | |
| IETLA | Tulla | CE |
| IETUL | Tullamore | OY |
| IETUW | Tullow | |
| IETYL | Tullylease | CO |
| IETLN | Tullynamalra | MN |
| IETYA | Tynagh | G |
| IEUTN | Urlingford | |
| IEVIR | Virginia | |
| IEWAL | Walkinstown | |
| IEWRL | Waterfall | |
| IEWAT | Waterford | WD |
| IEWCQ | Waterford City Quays | WD |
| IEWGI | Waterford Great Island (esb) | WD |
| IEWGH | Watergrasshill | CO |
| IEWVI | Waterville | KY |
| IEWES | Westport | |
| IEWEX | Wexford | |
| IEWHI | Whitegate | |
| IESWO | Swords | D |
| IETAL | Tallaght | D |
| IEITW | Tallow | WD |
| IETAR | Tarbert | |
| IETEM | Templemore | |
| IETPG | Templeogue | D |
| IETFK | Termonfeckin | LH |
| IETHO | Thomastown | |
| IETHR | Thurles | |
| IETLG | Timoleague | CO |
| IETIN | Tinahely | WW |
| IETPY | Tipperary | |
| IETIV | Tivoli | |
| IETOB | Tober | OY |
| IETOG | Togher | CO |
| IETRP | Tom Roes Point Terminal/drogheda | LH |
| IETQY | Town Quays/drogheda | LH |
| IETRA | Tralee | |
| IETME | Tramore | |
| IETRI | Trim | |
| IESRL | Shrule | G |
| IESMB | Sixmilebridge | CE |
| IESKE | Skerries | D |
| IESKB | Skibbereen | CO |
| IESKR | Skreen | SO |