The SN postcode area, also known as the Swindon postcode area, is a group of eighteen postcode districts in England, which are subdivisions of ten post towns. These postcode districts cover north Wiltshire, including Swindon, Chippenham, Calne, Corsham, Devizes, Malmesbury, Marlborough, Melksham and Pewsey, plus a small part of south-west Oxfordshire, including Faringdon, and a very small part of Gloucestershire.