Barnard Castle currently has 13 mapped postboxes recorded by The Postbox Hunter. The postboxes in Barnard Castle include 2 recorded royal cyphers. The most common is EIIR, recorded on 3 postboxes, representing 23.1% of the mapped total. The complete recorded cypher list is: EIIR (3) and GVIR (1). Among the recognised royal cyphers in the data, GVIR is the earliest recorded and EIIR is the most recent. The most commonly recorded postbox type is Pillar, with 1 mapped example. Across the available tagging data, 1 design are represented. This information is generated from the latest postbox location and tagging data available to The Postbox Hunter.