The TN postcode area, also known as the Tonbridge postcode area, is a group of 40 postcode districts in England, which are subdivisions of 24 post towns. These postcode districts cover south Kent (including Tunbridge Wells, Tonbridge, Ashford, Sevenoaks, Cranbrook, Edenbridge, New Romney, Romney Marsh, Tenterden and Westerham) and northern and eastern East Sussex (including Hastings, Battle, Bexhill-on-Sea, Crowborough, Etchingham, Hartfield, Heathfield, Mayfield, Robertsbridge, Rye, St Leonards-on-Sea, Uckfield, Wadhurst and Winchelsea). Additionally, small parts of TN14 and TN16 cover the southern part of the London Borough of Bromley, while TN16 also covers the village of Tatsfield in Surrey.