Blackadder is a village in the Scottish Borders, Scotland.
It is situated within the TD11 postcode district, which is within the Duns post town.
The full list of postcode districts within the Duns post town is as follows:
The Duns post town is within the Galashiels postcode area.
Administrative Ward: East Berwickshire
Administrative District: Scottish Borders
Country: Scotland
UK Parliament: Berwickshire, Roxburgh and Selkirk
NHS Local Health Authority: Borders