The next largest postcode is CV4 7ES with roughly 1, The biggest postcode area is IV , also known as Inverness. It is made up of 52 postcode districts for post towns. There are postcode areas in the United Kingdom. Although postal codes are usually assigned to geographical areas, special codes are sometimes assigned to individual addresses or to institutions that receive large volumes of mail, such as government agencies and large commercial companies.
The postcodes are alphanumeric, and are variable in length: ranging from six to eight characters including a space. Each postcode is divided into two parts separated by a single space: the outward code and the inward code respectively. The outward code includes the postcode area and the postcode district, respectively.
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They are usually named as a mnemonic to identify the area or Post Town they cover. 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.
London developed a postal code system in the 19th century, so area codes in London are taken from the earlier system. Almost 3, postal districts cover the UK. Postcode Districts are used to subdivide postal areas and help route mail to its sorting office. Districts fall into areas. On average there are 23 districts in an area. The actual number varies between 3 and Each one varies in size and population quite considerably.
The UK has about 11, postal sectors. Sectors are used in the inbound code to help pick the delivery round. There are between 1 and 10 sectors to make a district. On average each district has 3 sectors. A 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.
There are more than 1. This number changes regularly as around 2, postcodes are created and 2, are terminated each month. The allocation of postcodes depends on the amount of mail received.
Large users of mail such as the DVLA have different postcodes for different departments. The unit postcodes are used to find about 30 million actual addresses or delivery points, the minimum number of delivery points for a postcode is one, the maximum is , and on average the postcode is allocated to 17 delivery points.
There are on average postcodes to each sector: the most being , the least is 1. That leaves 20 for each letter. Since their inception, postcodes have become more than just a tool to help address mail. As postcodes nest into sectors, districts and areas, the postcode has become a handy label to define geographical locations.
Postcode boundaries provide a convenient way to tie people into manageable groups with similar lifestyles and outlooks to form the building blocks of geodemographic analysis. See our blog on geodemographic analysis Although postcodes focus on addresses, their aggregated groupings and boundaries provide an ideal building block for geographic analysis. Most businesses have data that is attached to postcode information.
This could be customer records, or sales receipts for a store where the customers are most likely to travel to. Having data attached to postcodes opens up analysis and comparisons using census or other demographic data. Our own GIS systems can use postcodes as their geographical key. Read about our work with postcode mapping Postcodes are a far more accessible reference than coordinates or longitude and latitude making them ideal for setting departure and destination points in navigation tools.
However, the sheer number of postcodes means that when you move beyond individual journeys, for business or fleet logistics planning the calculations required quickly become unmanageable.
See our blog on postcode sector-based journey planning In existence in some form for more than 1, years, the divisions are based on long-standing counties and parish boundaries, which have themselves changed and been sub-divided over the centuries.
This reference source ties postcodes to census and other demographic datasets. Read our blog exploring the history and use of administrative geography As you can see, postcodes have developed into far more than just a means of directing your post, they have become a fundamental building block for navigation, logistics and economic operation. Postcode mapping for business is what we do, so forgive us if we seem a little too passionate about the subject, but I'm sure you'll agree, there really is a lot to the humble postcode.
We've spent more than 25 years working with postcode geography and postcode mapping.
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