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![]() ![]() ![]() ![]() ![]() There was originally an S sector of the London postal district, which was abolished in 1868. Similarly, there were also S-prefixed postal districts in the compass-based system used in Glasgow prior to the introduction of the G postcode for that city: the former S1, S2, S3 and S4 areas on the South Side of Glasgow now have postcodes G41 through G44. The S20 district was formerly numbered S19; S21, S25 and S26 were formerly numbered S31, while S32 to S36 were formerly numbered S30. The S64 district was originally earmarked as the DN13 postcode district. On a map, a gap is formed in the geographic postcode pattern, which is why DN13 does not exist. The STD Telephone dialling code for Sheffield UK is 0114. The postal codes used in the United Kingdom are known as postcodes. They are alphanumeric and were introduced by the Royal Mail over a 15-year period from October 1959 to 1974. A full postcode is known as a "postcode unit" and usually corresponds to a limited number of addresses or a single large delivery point. Postcode units consist of between five and seven characters, separated into two parts by a space; there are approximately 1.8 million postcode units. The first part of the postcode unit is known as a "postcode district", or outward code, and usually corresponds to all or part of a post town. Postcode districts with the same one or two character prefixes are grouped into 124 postcode areas. Postcodes have been adopted for a wide range of purposes in addition to aiding the automating sorting of the mail; and are used to calculate insurance premiums, designate destinations in route planning software and are used as the lowest level of aggregation in census enumeration. Postcode data are stored, maintained and periodically updated in the Postcode Address File database, along with the full address data for around 27.5 million delivery points. An earlier system of postal districts was implemented in London and other large cities from 1857. In London this system was refined in 1917 to include numbered subdivisions, extending to the other cities in 1934. These earlier districts were later incorporated into the national postcode system. |