| PO Number | Town / Place name | Code
| | 200 | Dunmanway |
|
| 201 | Dunmore | |
| Dunrymond |
|
| 202 | Dunmore East | |
| Dunshaughlin |
|
| 203 | Dunshaughlin |
|
| 204 | Durrow |
|
| 205 | Edenderry |
|
| 206 | Edgworthstown |
|
| 207 | Elphin |
|
| 208 | Emo |
|
| 209 | Emyvale |
|
| 210 | Enfield |
|
| 211 | Ennis |
|
| 212 | Enniscorthy |
|
| 213 | Enniskerry |
|
| 214 | Enniskillen |
|
| 215 | Ennistimon |
|
| 216 | Eyrecourt |
|
| 217 | Ferbane | |
| Farranfore |
|
| 218 | Fermoy |
|
| 219 | Ferns |
|
| 220 | Fethard, Tip |
|
| 221 | Fethard, Wexford |
|
| 222 | Fintona | |
| Finglas |
|
| 223 | Fiuemilotown | |
| Fintona |
|
| 224 | Florence Court | |
| Fintown |
|
| 225 | Flurrybridge | |
| Fivemiletown |
|
| 226 | Forkhill |
|
| 227 | Foxford |
|
| 228 | Foynes |
|
| 229 | Frankford |
|
| 230 | Frenchpark |
|
| 231 | Freshford | |
| Geashill |
|
| 232 | Galway |
|
| 233 | Garvagh | |
| Gilford |
|
| 234 | Geashill | |
| Glasslough |
|
| 235 | Gilford | |
| Glasnevin | |
| Glencolumbkille |
|
| 236 | Glassclough | |
| Glenealy |
|
| 237 | Glenarm | |
| Garvagh |
|
| 238 | Glenavy | |
| Glenties |
|
| 239 | Glin |
|
| 240 | Golden | |
| Glenhull |
|
| 241 | Golden Ball |
|
| 242 | Gort |
|
| 243 | Gorey |
|
| 244 | Gowran |
|
| 245 | Graig | |
| Graigue | |
| Graiguenamagh |
|
| 246 | Granard |
|
| 247 | Grey Abbey | |
| Greystones |
|
| 248 | Goresbridge |
|
| 249 | Headford | |
| Hazelhatch |
|
| 250 | Hillsborough |
|
| 251 | Hollymount |
|
| 252 | Hollywood | |
| Howth |
|
| 253 | Howth | |
| Irvinestown |
|
| 254 | Inistogue | |
| Inniskeen |
|
| 255 | Innishannon | |
| Island Bridge | |
| Inver |
|
| 256 | Johnstown | |
| Inch, Gorey |
|
| 257 | Kanturk |
|
| 258 | Keady | |
| Kells, Killarney |
|
| 259 | Kells |
|
| 260 | Kenmare |
|
| 261 | Kilbeggan | |
| Kesh |
|
| 262 | Kilcock |
|
| 263 | Kilconnell | |
| Kilbride, Manor | |
| Kilbride, Dublin |
|
| 264 | Kilcullen | |
| Kilbrittain |
|
| 265 | Kildare |
|
| 266 | Kildorrey | |
| Killorglin |
|
| 267 | Kildysart | |
| Kilcar |
|
| 268 | Kilkeel |
|
| 269 | Kilkenny |
|
| 270 | Killala | |
| Killeshandra |
|
| 271 | Killaloe |
|
| 272 | Killarney |
|
| 273 | Killinardish | |
| Killiney |
|
| 274 | Killeagh | |
| Kilfenora |
|
| 275 | Killucan |
|
| 276 | Killybegs | |
| Killygordon |
|
| 277 | Killyleigh |
|
| 278 | Killynaule | |
| Killybegs |
|
| 279 | Killyshandra | |
| Killylea |
|
| 280 | Killinchy |
|
| 281 | Killough |
|
| 282 | Kilmacrennan |
|
| 283 | Kilmallock |
|
| 284 | Kilrea, Belfast |
|
| 285 | Kilrush |
|
| 286 | Kilworth |
|
| 287 | Kilmacthomas |
|
| 288 | Kingscourt | |
| Kincasslagh |
|
| 289 | Kingstown |
|
| 290 | Kinsale |
|
| 291 | Kinnegad | |
| Knockcloghrim |
|
| 292 | Kinnetty | |
| Rathmore |
|
| 293 | Kircubbin |
|
| 294 | Kish | |
| Knockcroghery |
|
| 295 | Knock | |
| Kylemore |
|
| 296 | Knocktopher | |
| Larne Harbour |
|
| 297 | Kinvara | |
| Leixlip |
|
| 298 | Lanesborough | |
| Letter |
|
| 299 | Larne |
|