The GY postcode area, also known as Guernsey postcode area,Royal Mail, Address Management Guide, (2004) its post town, is a group of 10 consecutive postal districts covering Guernsey, Alderney, Sark, Herm and the two inhabited lesser islets in that region of the Channel Islands. It was established in 1993 as an extension of the United Kingdom postcode system.Written Answer [87341], House of Commons Hansard, London, 17 December 2002, column 739W.
Coverage The approximate coverage of the postal districts. The post town is GUERNSEY for all postcode districts
Postcode district Sector(s) Unit codes Parish or island GY1 1, 2, 3, 4, 6, 7 Saint Peter Port 3 HR Herm in the above parishhttp://www.guernseypost.com/postcode_finder – GY1 3HR 4 AB Jethou in the above parish GY2 all Saint Sampson GY3 all Vale GY4 all Saint Martin GY5 all Castel GY6 8 AA – QZ Vale RA – ZZ Saint Andrew GY7 9 Saint Pierre du Bois Saint Saviour GY8 0 AA – JZ Forest KA – ZZ Torteval GY9 3 Alderney GY10 1 Sark
Previously, both Alderney and Sark were covered by the GY9 district. In March 2009, Royal Mail had "agreed in principle" for the creation of the GY10 district which would cover all addresses on the island of Alderney, leaving just those of smaller Sark in GY9. This was intended to reduce the amount of mail being sent to the wrong island. The States of Alderney opposed doing it that way round, and instead Sark changed from sector GY9 0 to GY10 1 on 5 January 2011.
See also Postcode Address File Guernsey Post List of postcode areas in the United Kingdom Jersey postcode area
References