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Post Codes

The Royal Mail designed and developed the postcode system in Great Britain to improve the efficiency of sorting and delivering mail. The postcode system is hierarchical, which means that it can be used at different levels of accuracy to specify locations.

The Postcode hierarchy structure.

Zone Example Quantity Average no. of households covered
Postcode Area CS 125 190,000
Postcode District CS2 2,828 8,275
Postcode Sector CS2 9 9,490 2,500
Postcode Unit CS2 9CE 1.7 million 15

 

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