Withyham is a village in East Sussex, England.
It is situated within the TN7 postcode district, which is within the Hartfield post town.
TN7 is the only postcode district within the Hartfield post town.
The Hartfield post town is within the Tonbridge postcode area.
Administrative Ward: Frant/Withyham
Administrative District: Wealden
Administrative County: East Sussex
Country: England
UK Parliament: Wealden
NHS Local Health Authority: South East Coast
NHS Region: Southern