Siston is a village in South Gloucestershire, England.
It is situated within the BS16 postcode district, which is within the Bristol post town.
The full list of postcode districts within the Bristol post town is as follows:
The Bristol post town is within the Bristol postcode area.
Administrative Ward: Siston
Administrative District: South Gloucestershire
Country: England
UK Parliament: Kingswood
NHS Local Health Authority: South West
NHS Region: Southern