Upwaltham is a village in West Sussex, England.
It is situated within the GU28 postcode district, which is within the Petworth post town.
GU28 is the only postcode district within the Petworth post town.
The Petworth post town is within the Guildford postcode area.
Administrative Ward: Boxgrove
Administrative District: Chichester
Administrative County: West Sussex
Country: England
UK Parliament: Chichester
NHS Local Health Authority: South East Coast
NHS Region: Southern