Postcode Districts are the first two letters plus two digits of the Postcode before the space (e.g. EH22) and there are nearly 3 000. In most areas our boundaries are finely detailed and created from following real features on air photography. The Postcode Areas and Postcode Districts are shown in red on top of appropriate map backgrounds depending on the zoom level. Use Postcode Districts for regional sales territories, delivery zones, marketing, etc.