Postcodes in the UK - United Kingdom. A postcode in the UK usually consists of two alphanumeric codes that identify a post town and a few addresses within it. The Outward code (Outcode) contains two to four characters, while the Inward code (Incode) always contains three. The Outcode identifies the postcode area.
Postal codes used in the United Kingdom
Postal codes used in the United Kingdom, British Overseas Territories and Crown dependencies are known as postcodes. They are alphanumeric and were adopted nationally between 11 October 1959 and 1974, having been devised by the General Post Office (Royal Mail). The system uses alphanumeric codes to designate geographic areas. A full postcode, also known as a "postcode unit", identifies a group of ... Wikipedia
