Unit PostcodeJanuary 29th, 2016
A full postcode e.g. TW8 8JA. In this example, the postcode area is TW, the postcode district is TW8, and the postcode sector is TW8 8. Each level nests into the level above it. There are roughly 1.75m unit postcodes in the UK, each covering an average of 18 addresses.