Preston St Mary is a village in Suffolk, England.
It is situated within the CO10 postcode district, which is within the Sudbury post town.
CO10 is the only postcode district within the Sudbury post town.
The Sudbury post town is within the Colchester postcode area.
Administrative Ward: North Cosford
Administrative District: Babergh
Administrative County: Suffolk
Country: England
UK Parliament: South Suffolk
NHS Local Health Authority: East of England
NHS Region: North, Midlands and the East