Humberston currently has 11 mapped postboxes recorded by The Postbox Hunter. The postboxes in Humberston include 1 recorded royal cypher. The most common is EIIR, recorded on 10 postboxes, representing 90.9% of the mapped total. The complete recorded cypher list is: EIIR (10). The most commonly recorded postbox type is Pillar, with 6 mapped examples. The data contains 2 different recorded postbox types. Across the available tagging data, 3 designs are represented. This information is generated from the latest postbox location and tagging data available to The Postbox Hunter.