| Code | Name | Region |
|---|---|---|
| IESRY | Skryne | MH |
| IESKL | Skull | CO |
| IESCH | Skull (schull) | CO |
| IESLN | Slane | |
| IESVE | Slieveroe | KK |
| IESLI | Sligo | |
| IESXL | Sligo Apt | |
| IESNE | Sneem | KY |
| IENNR | Spiddal | G |
| IESJH | St Johnston | DL |
| IESNR | Stokestown/new Ross | WX |
| IESTB | Stradbally | LS |
| IESDO | Stradone | CN |
| IESTF | Straffan | |
| IESUL | Summerhill | MH |
| IERNS | Rosenallis | |
| IERCB | Ross Carbery | CO |
| IERAV | Rossaveel | |
| IERSM | Rossaveel | G |
| IERSS | Rosses Point | SO |
| IEROE | Rosslare | |
| IEROS | Rosslare Harbour | |
| IERDW | Roundwood | WW |
| IERUS | Rushbrooke | |
| IESAG | Saggart | |
| IESTM | Saint Margaret's | D |
| IESLS | Sallins | KE |
| IESAL | Salt Hill | G |
| IESDN | Sandycove | DL |
| IESYF | Sandyford | D |
| IESAN | Santry/dublin | |
| IESCF | Scariff | |
| IESNN | Shannon | CE |
| IESRO | Shercock | CN |
| IESHG | Shillelagh | WW |
| IERCC | Rathcormack | |
| IERTD | Rathdowney | LS |
| IERDM | Rathdrum | WW |
| IERAE | Rathkeale | LK |
| IERAM | Rathmore | |
| IERAT | Rathmullan | DL |
| IERAW | Rathnew | WW |
| IERTW | Rathowen | WH |
| IERTT | Ratoath | MH |
| IERED | Redhouse | KK |
| IERHO | Rhode | OY |
| IERIN | Ringaskiddy | CO |
| IERDT | Ringaskiddy Deepwater Terminal | CO |
| IERPT | Ringaskiddy Passenger Terminal | CO |
| IERVM | River Moy |