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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 ]
In March 2013, CACI launched the latest version of Acorn, although the necessary data from the 2011 census was not available for the whole of the UK. The current version of Acorn does not rely on census data, [1] but uses the new data environment created by government policies on Open data and the availability of a number of brand new private sector datasets.
More recent versions have been developed at the individual household level and offer more accurate classification based on specific characteristics of each household. The 2009 Mosaic UK version, for example, classified the UK population into 15 main socio-economic groups and, within this, 67 different types.
It also links postcodes to pre-2002 health areas, 1991 Census enumeration districts for England and Wales, 2001 Census Output Areas (OA) and Super Output Areas (SOA) for England and Wales, 2001 Census OAs and SOAs for Northern Ireland and 2001 Census OAs and Data Zones (DZ) for Scotland. [1]
Postcode districts are one of ten digits: 0 to 9, with 0 only used once 9 has been used in a post town, save for Croydon (see above). Postcode sectors can also be one of ten digits: 0 to 9, though in some postcode areas the 0 is the beginning of the sequence (for example in LE), while in other areas it is the end of the sequence (ie. 10, as in CV).
The OAs generated in 2001 were retained as far as possible for the publication of outputs from the 2011 Census (less than 3% were changed [7]). Before 2001, census data was published for larger Enumeration Districts (ED) which were delineated before the census was conducted and were the organisational units for census data collection.
International Territorial Level (ITL) is a geocode standard for referencing the subdivisions of the United Kingdom for statistical purposes, used by the Office for National Statistics (ONS). From 2003 and until 2020 it functioned as part of the European Union and European Statistical System 's geocode standard Nomenclature of Territorial Units ...
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]