KML is from Wikidata The ME postcode area, also known as the Rochester postcode area, is a group of twenty postcode districts in South East England, within eleven post towns. These cover north central Kent, including the Medway unitary authority and the borough of Swale, plus parts of the boroughs of Maidstone, Tonbridge and Malling, and Gravesham. The letters in the postcode are derived from the name of the Medway conurbation.