Postcode Sectors are given by the number after the space in the Postcode (e.g. EH22 2) and there are over 10 000. In most areas our boundaries are finely detailed and created from following real features on air photography. The Postcode Areas, Postcode Districts and Sectors are shown in red on top of appropriate map backgrounds depending on the zoom level. Use Postcode Sectors for the most detailed Postcode mapping, e.g. city or regional sales territories, delivery zones, marketing, etc.