BT
80 districts, 50,116 postcodes
Belfast, Fermanagh and Omagh, Armagh City, Banbridge and Craigavon, Newry, Mourne and Down, Ards and North Down, Causeway Coast and Glens, and others
| District | Postcodes | Local authority |
|---|---|---|
| BT1 | 535 | Belfast |
| BT10 | 214 | Belfast |
| BT11 | 476 | Belfast |
| BT12 | 631 | Belfast |
| BT13 | 572 | Belfast |
| BT14 | 636 | Belfast |
| BT15 | 617 | Belfast |
| BT16 | 402 | Lisburn and Castlereagh |
| BT17 | 570 | Belfast |
| BT18 | 394 | Ards and North Down |
| BT19 | 878 | Ards and North Down |
| BT2 | 109 | Belfast |
| BT20 | 705 | Ards and North Down |
| BT21 | 244 | Ards and North Down |
| BT22 | 586 | Ards and North Down |
| BT23 | 1,499 | Ards and North Down |
| BT24 | 501 | Newry, Mourne and Down |
| BT25 | 442 | Armagh City, Banbridge and Craigavon |
| BT26 | 268 | Lisburn and Castlereagh |
| BT27 | 584 | Lisburn and Castlereagh |
| BT28 | 1,094 | Lisburn and Castlereagh |
| BT29 | 377 | Antrim and Newtownabbey |
| BT3 | 95 | Belfast |
| BT30 | 1,127 | Newry, Mourne and Down |
| BT31 | 291 | Newry, Mourne and Down |
| BT32 | 738 | Armagh City, Banbridge and Craigavon |
| BT33 | 314 | Newry, Mourne and Down |
| BT34 | 1,511 | Newry, Mourne and Down |
| BT35 | 1,302 | Newry, Mourne and Down |
| BT36 | 1,087 | Antrim and Newtownabbey |
| BT37 | 595 | Antrim and Newtownabbey |
| BT38 | 950 | Mid and East Antrim |
| BT39 | 653 | Antrim and Newtownabbey |
| BT4 | 653 | Belfast |
| BT40 | 748 | Mid and East Antrim |
| BT41 | 1,059 | Antrim and Newtownabbey |
| BT42 | 870 | Mid and East Antrim |
| BT43 | 581 | Mid and East Antrim |
| BT44 | 694 | Causeway Coast and Glens |
| BT45 | 1,044 | Mid Ulster |
| BT46 | 321 | Mid Ulster |
| BT47 | 1,339 | Derry City and Strabane |
| BT48 | 1,192 | Derry City and Strabane |
| BT49 | 489 | Causeway Coast and Glens |
| BT5 | 876 | Belfast |
| BT51 | 816 | Causeway Coast and Glens |
| BT52 | 503 | Causeway Coast and Glens |
| BT53 | 764 | Causeway Coast and Glens |
| BT54 | 273 | Causeway Coast and Glens |
| BT55 | 311 | Causeway Coast and Glens |
| BT56 | 240 | Causeway Coast and Glens |
| BT57 | 182 | Causeway Coast and Glens |
| BT6 | 560 | Belfast |
| BT60 | 954 | Armagh City, Banbridge and Craigavon |
| BT61 | 475 | Armagh City, Banbridge and Craigavon |
| BT62 | 768 | Armagh City, Banbridge and Craigavon |
| BT63 | 508 | Armagh City, Banbridge and Craigavon |
| BT64 | 86 | Armagh City, Banbridge and Craigavon |
| BT65 | 110 | Armagh City, Banbridge and Craigavon |
| BT66 | 783 | Armagh City, Banbridge and Craigavon |
| BT67 | 506 | Armagh City, Banbridge and Craigavon |
| BT68 | 50 | Mid Ulster |
| BT69 | 91 | Mid Ulster |
| BT7 | 391 | Belfast |
| BT70 | 675 | Mid Ulster |
| BT71 | 1,065 | Mid Ulster |
| BT74 | 781 | Fermanagh and Omagh |
| BT75 | 136 | Mid Ulster |
| BT76 | 75 | Mid Ulster |
| BT77 | 50 | Mid Ulster |
| BT78 | 1,186 | Fermanagh and Omagh |
| BT79 | 936 | Fermanagh and Omagh |
| BT8 | 650 | Lisburn and Castlereagh |
| BT80 | 688 | Mid Ulster |
| BT81 | 296 | Derry City and Strabane |
| BT82 | 713 | Derry City and Strabane |
| BT9 | 589 | Belfast |
| BT92 | 1,295 | Fermanagh and Omagh |
| BT93 | 849 | Fermanagh and Omagh |
| BT94 | 898 | Fermanagh and Omagh |