The DT postcode area, also known as the Dorchester postcode area,[2] is a group of eleven postcode districts in South West England, within nine post towns.
These 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.
The approximate coverage of the postcode districts: