List of postcode areas in the United Kingdom facts for kids

The list of postcode areas in the United Kingdom is a tabulation of the postcode areas used by Royal Mail for the purposes of directing mail within the United Kingdom. The postcode area is the largest geographical unit used and forms the initial characters of the alphanumeric UK postcode. There are currently 121 geographic postcode areas in use in the UK and a further three often combined with these covering the Crown Dependencies of Guernsey, Jersey and Isle of Man.

Subdivision

Each postcode area is further divided into post towns and postcode districts. There are on average 20 postcode districts to a postcode area. The London post town is instead divided into several postcode areas.

Scope

The single or pair of letters chosen for postcode areas are generally intended as a mnemonic for the places served. Postcode areas, post towns and postcode districts do not follow political boundaries and usually serve much larger areas than the place names with which they are associated. For example, within the PA postcode area the PA1 and PA78 postcode districts are 140 miles (225 km) apart; and the eight postcode areas of the London post town cover only 40% of Greater London. The remainder of its area is covered by sections of twelve adjoining postcode areas: EN, IG, RM, DA, BR, TN, CR, SM, KT, TW, HA and UB.

United Kingdom postcode areas

Map of postcode areas in the United Kingdom and Crown dependencies, with links to each postcode area

Crown dependencies

The Crown dependencies (which are not part of the United Kingdom) did not introduce postcodes until later, but use a similar coding scheme. They are separate postal authorities.

Defunct postcode areas

London NE and S

Glasgow

Glasgow, like London, was divided into compass districts: C, W, NW, N, E, SE, S, SW. When postcodes were introduced, these were mapped into the new G postcode: C1 became G1, W1 became G11, N1 became G21, E1 became G31, S1 became G41, SW1 became G51, and so on. As NW and SE had never been subdivided they became G20 and G40 respectively.

Norwich and Croydon

Norwich and Croydon were used for a postcode experiment in the late 1960s, which was replaced by the current system. The format was of the form NOR or CRO followed by two numbers and a letter, e.g. NOR 07A. They were later changed to CR0 (digit '0') and NR1.

Dublin, Ireland

When Ireland was a part of the United Kingdom of Great Britain and Ireland a postal district system was introduced in 1917 by the UK government. The letter D was assigned to Dublin. Upon the establishment of the Irish Free State and later, the Republic of Ireland, the Irish government retained the designation and today it forms part of the Eircode system, a postcode format slightly different from the UK format and identifying individual addresses. Since Irish independence, D has never been reassigned as a postcode area in the UK.

Non-geographic postcodes

Some postcode areas do not correspond to geographical areas. A number of non-geographic postcode sectors are also contained within geographic postcode areas.

BF

The BF postcode area was introduced in 2012 to provide optional postcodes for British Forces Post Office addresses, for consistency with the layout of other UK addresses. It uses the national non-geographic post town "BFPO" and, as of 2012, the postcode district "BF1".

BX

The non-geographic postcode area BX has been introduced for addresses which do not include a locality; this allows large organisations long-term flexibility as to where they receive their mail. This postcode area is used by Lloyds Banking Group (BX1 1LT), HSBC (BX8 0HB) and parts of HM Revenue and Customs like VAT (BX5 5AT) and Pay As You Earn (BX9 1AS). Lloyds Bank also use BX4. After splitting from Lloyds, TSB Bank uses BX4 7SB, the latter part of which, when written, looks similar to "TSB".

GIR

GIR 0AA is a postcode created for Girobank in Bootle. It remained in use by its successors when Girobank was taken over by Alliance & Leicester and subsequently by Santander UK.

XM

XM4 5HQ is a postcode created for Father Christmas.

XX

The non-geographic postcode area XX is used by online retailers for returns by Royal Mail, and for COVID-19 test samples.

Overseas territories

Certain British Overseas Territories introduced single postal codes for their territory or major sub-sections of it. These are not UK postcodes, even though many are formatted in a similar fashion:

Territory	Postcode
Anguilla	AI-2640
Saint Helena, Ascension and Tristan da Cunha:  Ascension Island  Saint Helena  Tristan da Cunha	ASCN 1ZZ STHL 1ZZ TDCU 1ZZ
British Indian Ocean Territory	BBND 1ZZ
British Antarctic Territory	BIQQ 1ZZ
Falkland Islands	FIQQ 1ZZ
Gibraltar	GX11 1AA
Pitcairn Islands	PCRN 1ZZ
South Georgia and the South Sandwich Islands	SIQQ 1ZZ
Turks and Caicos Islands	TKCA 1ZZ

Other overseas territories have introduced their own more extensive postcode systems:

Overseas Territory	Further information
Bermuda	Postal codes in Bermuda
Cayman Islands	Postal codes in the Cayman Islands
British Virgin Islands	Postal codes in the British Virgin Islands
Montserrat	Postal codes in Montserrat

Civilian residential and business addresses in Akrotiri and Dhekelia are served by Cyprus Postal Services and use Cypriot postal codes.

Mail to Overseas Territories is treated as international if posted in the UK.

See also

• List of postcode areas in the United Kingdom by population
• List of postcode districts in the United Kingdom
• Postcodes in the United Kingdom
• UK Postcode Regions by Population
• List of Eircode routing areas in Ireland