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The postcode area is the largest geographical unit used and forms the initial characters of the alphanumeric UK postcode. [1] 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.
The full delivery address including postcode can be validated against the Royal Mail Postcode Address File (PAF), which lists 29 million valid delivery addresses, [27] constituting most (but not all) addresses in the UK. [28] A regular expression for validating UK postcodes is specified in the British Standards document BS 7666. [29]
Postcode areas shown with former postal counties. This is a list of postcode districts in the United Kingdom and Crown Dependencies. A group of postcode districts with the same alphabetical prefix is called a postcode area. All, or part, of one or more postcode districts are grouped into post towns. [1]
The UK postcode is made up of two parts separated by a space. These are known as the outward postcode and the inward postcode. The outward postcode is always one of the following formats: AN, ANN, AAN, AANN, ANA, AANA, AAA. The inward postcode is always formatted as NAA. A valid inward postcode never contains the letters: C, I, K, M, O or V.
Address Management Guide (6th ed.). "Royal Mail major recode historical information – 2000 to September 2011" (PDF). Royal Mail. 3 November 2011. Archived from the original (PDF) on 26 September 2017
For the purposes of directing mail, the United Kingdom (although the populations listed just show figures for England, Wales and Northern Ireland), is divided by Royal Mail into postcode areas. The postcode area is the largest geographical unit used and forms the initial characters of the alphanumeric UK postcode . [ 1 ]
Postcodes for PO Box addresses, however, consist of four letters. In the capital, Hamilton, a PO Box address would be: Mr. Boxholder PO Box HM 2469 HAMILTON HM GX BERMUDA. In Hamilton, each PO Box number range has a different postcode, while postcodes for PO Box addresses in the rest of Bermuda will always end in BX, for example: PO Box DV 583
The Postcode Address File (PAF) is a database that contains all known "delivery points" and postcodes in the United Kingdom. The PAF is a collection of over 29 million Royal Mail postal addresses and 1.8 million postcodes . [ 1 ]