The allocation of postcodes depends on the amount of mail received. This number changes regularly as around 2,750 postcodes are created and 2,500 are terminated each month. There are more than 1.7 million (1,770,724 as at November 2020 ) unit postcodes. Average number of districts in an area 23.Ī unit postcode describes a street or part of street, a single address, a group of properties, a subsection of a property or an individual organisation or department within an organisation.Largest number of districts in an area BT, Belfast (80).Smallest number of districts in an area ZE, Shetland (3).Largest population B, Birmingham (2 million people).Smallest population ZE, Shetland (22,990 people).Largest size IV, Inverness (6,243 square miles).Smallest size WC, West Central London (1 square mile ).N: North London, WC: West Central London.
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London developed a postal code system in the 19th century, so area codes in London are taken from the earlier system. Most of the names are obvious but there are some mismatches, for example Rochester in Kent has an area code of ME for Medway and Lerwick in Shetland has a code of ZE for Zetland (an archaic spelling of Shetland). They are usually named as a mnemonic to identify the area or Post Town they cover. Please keep in mind that the postcode network is constantly changing and this data is just a snapshot at the time of writing - November 2020.ġ25 postcode areas cover the United Kingdom, with each varying in size and population. Of course each element has a lot more too it than that, so let's look at each in more detail from largest to smallest. Unit: QW: Two alpha characters showing a group of buildings, a street, part of a street or a single delivery point.Sector: 5: One numeric character subdividing the district.District: 30: One or two alphanumeric characters subdividing the area.Area: YO: One or two alpha characters subdividing the country.Let's take a look at an example: Example: The elements of postcode YO30 5QW The second part, the “inbound” code, is then used to pinpoint the exact neighbourhood and postal round it needs to go to this always follows a space and has three alphanumeric characters. Put simply, the first half of the postcode is the “outbound” code, allowing a letter to be sent to the correct part of the country this is made up of between two and four alphanumeric characters. So how does this collection of letters and numbers fit together to make a rational and reliable system? How does the modern UK postcode system work? Norwich is the last place to be re-coded. 1971: Addresses receive notification of their own postcodes.1967 - 1970: Rollout of new codes to major centres: Aberdeen, Belfast, Brighton, Bristol, Bromley, Cardiff, Coventry, Manchester, Newcastle upon Tyne, Newport, Reading, Sheffield, Southampton and the Western district of London.1967: New postal codes introduced in Croydon.1965: The Postmaster General, Tony Benn MP, announced postal coding would extend to the whole of the UK over the next few years.Sorting machines needed the address to be machine-readable, so a code system was developed from the Norwich trials. Early 1960s: The Royal Mail starts a mechanisation program to introduce reliable mechanical sorting.
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