Santon Downham is a village in Suffolk, England.
It is situated within the IP27 postcode district, which is within the Brandon post town.
IP27 is the only postcode district within the Brandon post town.
The Brandon post town is within the Ipswich postcode area.
Administrative Ward: Brandon East
Administrative District: Forest Heath
Administrative County: Suffolk
Country: England
UK Parliament: West Suffolk
NHS Local Health Authority: East of England
NHS Region: North, Midlands and the East