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Electoral list of Administrative Wards, Districts and Counties along with their associated Postcodes: A Ward in the United Kingdom is an electoral district that could have several local authority Councillors representing it.  This file of 1.696 million postcodes links directly to the electoral wards that fall within Great Britain.  Whilst business operations are based completely around postcode boundaries the age old policies of government remain locked in time using administrative geography such as wards. As

you may know, the two processes of postal delivery systems and political administrative ward boundaries developed independently of each other.  This regrettably means that no official direct link between postcode to Administrative Wards, Districts or Counties currently exists.

This maintained Postcode to Administrative Ward table is  continually rebuilt and updated every three months to ensure it's as accurate as can be.  The file itself is based on Royal Mail and Ordnance Survey source data which should help you appreciate that the Wards and Postcodes are very accurate and up to date. 

Ordnance Survey Postcode Admin Table - Product Specifics

Delivery: Immediate Download / Recorded Delivery
File Size: 6.10 MB (6,399,734 bytes) - WinZip Compressed
Volume: File 1 of 2) 848044 records; File 2 of 2) 848044 records; Total = 1,696,088 records
Fields: (specification for list)
Format: Comma Separated Variable (CSV)
Compatibility: MS Access, MS Excel 2007 and any other application with text import
Coverage: Great Britain* (excludes NI and Isle of Man).
Updates: Includes quarterly updates within licensed period.
Licence: 12 months unlimited use  
Restrictions: Terms & Conditions.
* GB is defined as England, Scotland and Wales and Islands such as the Isle of Wight, Anglesey, the Isles of Scilly, the Hebrides, and the island groups of Orkney and Shetland.