KML is from Wikidata The DE postcode area, also known as the Derby postcode area, is a group of 23 postcode districts in central England, within 11 post towns. These cover south and central Derbyshire (including Derby, Alfreton, Ashbourne, Bakewell, Belper, Heanor, Ilkeston, Matlock, Ripley and Swadlincote), parts of east Staffordshire (including Burton upon Trent) and north-west Leicestershire, and very small parts of Nottinghamshire.