
London post codes are an essential part of navigating the city, and understanding how they work can make a big difference in getting around.
London's post code system is divided into nine zones, each represented by a letter from A to K, with the majority of post codes starting with EC for the City of London.
The most northerly post code in London is N, covering areas such as Hampstead and Camden.
There are over 2,000 different post codes in London, making it one of the most complex post code systems in the world.
Understanding Postcodes
London postcodes can seem confusing at first, but once you understand how they work, they become an essential tool for navigating the city.
A typical London postcode consists of two parts: the outward code and the inward code. The outward code is the general geographic area and specific geographic area.
Each geographic area is subdivided into numbered regions, with the number indicating how far away from the city center it is. Typically, the number 1 will be closest to the center of London, and the biggest numbers, like N20, will be the farthest away.
The last part of the code (inward code) – the last 3 numbers and letters – signify a specific city block.
Zip Code Existence
Zip codes don't exist in London, they have postal codes instead.
In the UK, postcodes start with letters and often cover a much smaller area.
The signifier "N" only covers a specific area of North London.
This is because London postcodes are designed to be more precise than traditional zip codes.
If you're planning to send mail to London, make sure to use the correct postal code to ensure it reaches the right address.
Geographic Region
In London, each geographic area is subdivided into numbered regions, such as West London with codes like W1, W2, and W3.
The number in the postcode can give you an idea of how far away something is from the city center. Typically, the number 1 will be closest to the center of London.
Areas in Northwest London start with NW, like NW1, NW2, or NW3. This system helps with mail delivery, but it's also useful for understanding distances within the city.
The bigger the number, the farther away from the city center it is. For example, if you're in N1 and the place you want to go is in N20, it's going to be quite far away.
Using Postcodes
London postcodes are used for mail delivery, ensuring that letters and parcels reach the correct address.
You can also use postcodes for navigation by entering them into a satnav or mapping app, which will take you directly to the correct city block.
Knowing the house or building number is still necessary to find exactly where you're going, though.
Local services like libraries, schools, and hospitals use postcodes to identify their catchment areas.
If you're a Londoner, you know how big the city can be, and how easy it is to get lost. But with postcodes, you can navigate the city with ease.
Plug in a postcode and cross-check the address, and you'll never go to the wrong place.
Here are some of the most useful purposes of London postcodes:
- Mail delivery
- Navigation
- Local services
Postcode Structure
A typical London postcode looks like this: W1-5DU. It consists of two parts: the outward code and the inward code. The outward code is the general geographic area and specific geographic area.
The last part of the code, the inward code, signifies a specific city block. This code is made up of the last 3 numbers and letters.
The outward code is further divided into sectors based around the points of the compass, with the central area of London having its own two districts - East and West Central (EC and WC).
Postal Districts
London's postal districts are a fascinating topic, and understanding them can be really helpful when navigating the city. The central area of London is divided into two districts: East Central (EC) and West Central (WC).
Each of the other sectors is divided into postal districts with a letter prefix, such as N, W, E, NW, SW, and SE. The most central district in each sector is assigned the number 1.
The way the areas are numbered might seem random, but it's actually based on the name of the local delivery office. In areas adjacent to the more desirable districts, you can see huge differences in house prices depending on the property's proximity to the supposedly desirable neighbouring district.
The original postal district system was updated around the time of the First World War, and it's still the system we use today. London was the first region of the British Isles to have postcodes, with the initial system set up in the 19th century.
High-Density Districts

In central London, you'll find seven high-density postcode districts that have been subdivided to meet the heavier demand. These districts are E1, N1, EC, SW1, W1, WC1, and WC2.
The subdivision process involves adding a letter to the original postcode district, resulting in new, smaller postcode districts. For example, W1P is a new sub-district.
Where these sub-districts are used on street signs and maps, the original unsuffixed catch-all versions often remain in use. This can be confusing, but it's a common practice.
Some of these high-density districts have multiple subdivisions, such as W1 and WC1. These subdivisions help to further break down the areas into smaller regions.
Non-geographic suffixed sub-districts are also used for PO boxes in certain areas, like NW1 and SE1. For example, NW1W is a PO box sub-district in NW1.
Relationship and Significance
London post codes have a significant impact on our daily lives, and understanding their relationship to the city's layout is crucial. London is divided into nine postal regions, each with its own unique characteristics.
The SW1 post code is reserved for the City of Westminster, which is home to many government buildings and institutions. The area is often referred to as the heart of London.
The N post codes cover the northern parts of the city, including areas like Islington and Hackney. These areas are known for their vibrant cultural scenes and trendy neighborhoods.
The W post codes cover the western parts of the city, including areas like Kensington and Chelsea. These areas are known for their upscale shopping and dining options.
The E post codes cover the eastern parts of the city, including areas like Tower Hamlets and Newham. These areas are known for their rich history and cultural diversity.
The SE post codes cover the southeastern parts of the city, including areas like Southwark and Lewisham. These areas are known for their beautiful parks and green spaces.
The NW post codes cover the northwestern parts of the city, including areas like Camden and Brent. These areas are known for their eclectic mix of shops and restaurants.
The EC post code covers the eastern central part of the city, including areas like the City of London and Shoreditch. This area is known for its financial institutions and trendy bars.
Understanding London's post code system can make navigating the city much easier, whether you're a resident or a visitor.
Frequently Asked Questions
What is a full UK postcode?
A full UK postcode is a unique five to seven character code that identifies a specific delivery point or an area with multiple addresses. It's a crucial piece of information for mail and package delivery in the UK.
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