Postcode

A coding system for referencing all properties in a country which have a postal address. There are four components to the code:

• the Area (e.g. HX)
• the District (e.g. 22)
• the Sector (e.g. 9)
• the Unit (e.g. JT)

A unit postcode applies to a group of addresses of (approximately) 15 neighbouring properties.