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This is a list of 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. [1]
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 ]
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] Until 1996, Royal Mail required counties to be included in addresses, except for 110 of the larger post towns.
The full delivery address including postcode can be validated against the Royal Mail Postcode Address File (PAF), which lists 29 million valid delivery addresses, [28] constituting most (but not all) addresses in the UK. [29] A regular expression for validating UK postcodes is specified in the British Standards document BS 7666. [30]
Postcode area Postcode name ... Royal Mail (1999). Address Management Guide (6th ed.). "Royal Mail major recode historical information – 2000 to September 2011" (PDF).
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]
The Royal Mail ceased to use postal counties as a means of sorting mail following the modernisation of their optical character recognition equipment in 1996. Instead, using postcode defined circulation, the outward code (first half) of the postcode is used to differentiate between like-sounding post towns.
RM4SCC (Royal Mail 4-State Customer Code) [1] is the name of the barcode character set based on the Royal Mail 4-State Bar Code symbology created by Royal Mail. The RM4SCC is used for the Royal Mail Cleanmail service. It enables UK postcodes as well as Delivery Point Suffixes (DPSs) to be easily read by a machine at high speed.