Editing Postcodes in the United Kingdom (section)

=== Structure ===
A full postcode is known as a "postcode unit" and designates an area with several addresses or a single major delivery point.<ref name=guide/> The structure of a postcode is two alphanumeric codes that show, first, the post town and, second, a small group of addresses in that post town. The first alphanumeric code (the outward code or outcode) has between two and four characters and the second (the inward code or incode) always has three characters. The outcode indicates the postcode area and postcode district. It consists of one or two letters, followed by one digit, two digits, or one digit and one letter. This is followed by a space and then the incode which indicates the postcode sector and delivery point (usually a group of around 10-15 addresses,{{citation needed|date=December 2024}} but can vary).  The incode (always three characters), starts with a number (denoting a sector within the district), and ends with two letters (denoting delivery points which are allocated to streets, sides of a street or individual properties).