Gun Hill is a village in East Sussex, England.
It is situated within the TN21 postcode district, which is within the Heathfield post town.
TN21 is the only postcode district within the Heathfield post town.
The Heathfield post town is within the Tonbridge postcode area.
Administrative Ward: Chiddingly and East Hoathly
Administrative District: Wealden
Administrative County: East Sussex
Country: England
UK Parliament: Wealden
NHS Local Health Authority: South East Coast
NHS Region: Southern