| Code | Name | Region |
|---|---|---|
| IERVT | Riverstown | LH |
| IERCM | Rockmills | CO |
| IEROO | Roosky | RN |
| IERON | Roscommon | RN |
| IERSC | Roscrea | |
| IEOCA | Ocallaghansmills | |
| IENOV | Oldcastle | |
| IEONE | Oranmore | G |
| IEOUG | Oughterard | G |
| IEOVE | Ovens | CO |
| IEPMS | Palmerston | D |
| IEPAT | Pandoro Terminal | |
| IEPAP | Parnell Place | |
| IEPAW | Passage West | CO |
| IEPTW | Piltown | KK |
| IEPBE | Pluckerstown Bridge | KE |
| IEPOR | Portarlington | LS |
| IEPGN | Portglenone | |
| IEPTL | Portlaoise | LS |
| IEPOK | Portmarnock | D |
| IEPTA | Portumna | |
| IERAH | Raheenagh | LK |
| IERTN | Ramelton | DL |
| IERNG | Rathangan | |
| IERCO | Rathcoole | D |
| IEMUE | Mullinahone | TA |
| IEMUL | Mullingar | |
| IEMLM | Multyfarnham | WH |
| IEMUR | Murroe | LK |
| IENAA | Naas | KE |
| IENUL | Naul | D |
| IEAUU | Navan (an Uaimh) | MH |
| IENEN | Nenagh | TA |
| IENRS | New Ross | WX |
| IENRR | New Ross-raheen/roberscon | WX |
| IENBS | Newbliss | MN |
| IENWG | Newbridge | KE |
| IENWC | Newcastle | D |
| IENEW | Newcastle West | |
| IENMR | Newmarket | CO |
| IENOF | Newmarket On Fergus | CE |
| IENET | Newport | MO |
| IENAY | Newtonabbey | |
| IENEX | Newtown | WX |
| IENMK | Newtown Mount Kennedy | WW |
| IEMIL | Millstreet | CO |
| IEMTW | Milltown | G |
| IEMNM | Milltown Malbay | CE |
| IEMIT | Mitchelstown | CO |
| IEMOA | Moate |