Coulston is a village in Wiltshire, England.
It is situated within the BA13 postcode district, which is within the Westbury post town.
BA13 is the only postcode district within the Westbury post town.
The Westbury post town is within the Bath postcode area.
Administrative Ward: Ethandune
Administrative District: Wiltshire
Country: England
UK Parliament: South West Wiltshire
NHS Local Health Authority: South West
NHS Region: Southern