The DT postcode area, also known as the Dorchester postcode area, is a group of eleven postcode districts in England, which are subdivisions of nine post towns. These postcode districts cover much of Dorset, including Dorchester, Weymouth, Beaminster, Blandford Forum, Bridport, Lyme Regis, Portland, Sherborne and Sturminster Newton, plus very small parts of Devon and Somerset.