| Castlereagh Postal Code, Northern Ireland, United Kingdom |
| Country | State | Town/City | Zipcode |
| United Kingdom | Northern Ireland | Castlereagh | BT5 |
| United Kingdom | Northern Ireland | Castlereagh | BT6 |
Postal Codes of Cities in Northern Ireland, United Kingdom
- Postal Code of Aghadowey
- Postal Code of Aghagallon
- Postal Code of Aghalee
- Postal Code of Aghyaran
- Postal Code of Aird
- Postal Code of Aldergrove
- Postal Code of Andersonstown
- Postal Code of Annaclone
- Postal Code of Annahilt
- Postal Code of Annalong
- Postal Code of Antrim
- Postal Code of Antrim Road
- Postal Code of Ardboe
- Postal Code of Ardglass
- Postal Code of Ardkeen
- Postal Code of Armagh
- Postal Code of Armoy
- Postal Code of Articlave
- Postal Code of Artigarvan
- Postal Code of Augher
- Postal Code of Aughnacloy
- Postal Code of Avoch
- Postal Code of Baile A'Mhanaich
- Postal Code of Baile Nan Cailleach
- Postal Code of Ballgomartin
- Postal Code of Ballinamallard
- Postal Code of Ballinaskeagh
- Postal Code of Ballinderry Lower
- Postal Code of Ballinderry Upper
- Postal Code of Ballintoy
- Postal Code of Ballybogy
- Postal Code of Ballycarry
- Postal Code of Ballycastle
- Postal Code of Ballyclare
- Postal Code of Ballygally
- Postal Code of Ballygawley
- Postal Code of Ballyhalbert
- Postal Code of Ballyhornan
- Postal Code of Ballykelly
- Postal Code of Ballykinler
- Postal Code of Ballymagorry
- Postal Code of Ballymartin
- Postal Code of Ballymena
- Postal Code of Ballymoney
- Postal Code of Ballynagard
- Postal Code of Ballynahinch
- Postal Code of Ballynure
- Postal Code of Ballypatrick
- Postal Code of Ballyronan
- Postal Code of Ballyroney
- Postal Code of Ballysillan
- Postal Code of Ballysillan Upper
- Postal Code of Ballyvelton
- Postal Code of Ballyvoy
- Postal Code of Ballywalter
- Postal Code of Ballyward
- Postal Code of Banbridge
- Postal Code of Bangor
- Postal Code of Belcoo
- Postal Code of Belfast