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British postal codes are in two parts. The first part is either one or two letters followed by one or two numbers. The letters of the first part indicate the area, whilst the numbers narrow it down to single towns or districts.

The second part of the postcode is a single number and two letters, which is the 'route' number - larger premises (commercial offices) will have a unique code, whereas residential addresses in the same street often share one code. Long streets can have multiple codes.

For example;

L4 9AH - The Liverpool district of Anfield.

PO12 3AA - Portsmouth Area, Gosport.

GU35 9RE - Guildford Area, Bordon.

London is different as the area code indicates broad compass points; N, NW, SW, SE, W and E. Central London is split into WC and EC (West Central and East Central). The numeric part indicates the borough;

E17 - Walthamstow

SW19 - Wimbledon

N5 - Highbury

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15y ago

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