| PO Number | Town / Place name | Code |
|---|---|---|
| 500 | Whiteabbey | |
| 501 | Doagh | |
| 502 | Ballinamore | |
| 503 | Doochary | |
| 504 | Vacant in 1887 | |
| 505 | Upperlands | |
| 506 | Dervock | |
| 507 | Ballinrobe | |
| 508 | Timoleague | |
| 509 | Bailieborough | |
| 510 | Kingscourt | |
| 511 | Macroom | |
| 512 | Ballinlough | |
| 513 | Glenanne | |
| 514 | Limerick Junction | |
| 515 | Hill of Down | |
| 516 | Moycullen | |
| 517 | Rosscahill | |
| 518 | Oughterard | |
| 519 | Maam Cross | |
| 520 | Maam | |
| 521 | Leenane | |
| 522 | Rusmuck | |
| Rosmuck | ||
| 523 | Recess | |
| 524 | Cashel, Galway | |
| 525 | Letterfrack | |
| 526 | Ballycroy | |
| 527 | Ballyglass | |
| 528 | Tourmakeady | |
| 529 | The Neale | |
| 530 | Cong | |
| 531 | Sion Mills | |
| 532 | Dromahair | |
| 533 | Toombeola | |
| 534 | Bangor | |
| 535 | Holywood | |
| 536 | Strandtown | |
| 537 | Donaghadee | |
| 538 | Dundrum, Down | |
| 539 | Newcastle, Down | |
| 540 | Ardagh | |
| 541 | Six Mile Cross | |
| 542 | Maguiresbridge | |
| 543 | Slane | |
| 544 | Ardfert | |
| 545 | Lisdoonvarna | |
| 546 | Vacant in 1892 | |
| 547 | Lisselton Cross | |
| Lisselton | ||
| 548 | Headford, Killarney | |
| 549 | Ballincollig | |
| 550 | Ballinskelligs | |
| 551 | Glenbeigh | |
| 552 | Valencia Island | |
| 553 | Waterville | |
| 554 | Dunboyne | |
| 555 | Annascaul | |
| 556 | Blennerville | |
| 557 | Woodenbridge | |
| 558 | Bawnboy | |
| 559 | Ballyconnell | |
| 560 | Bushmills | |
| 561 | Ardara | |
| 562 | Bruckless | |
| 563 | Carrick | |
| 564 | Mount Charles |