|The physical style (size/shape) of the post box, and how it is mounted.|
|Used on these elements|
|Status: de facto|
|Tools for this tag|
The physical style (size/shape) of the post box, and how it is mounted.
Values by country or operator
|pillar||A freestanding box, square in shape.|
|community||Community mailboxes contain individual mailboxes, plus an outbound mailslot. See Canadian tagging guidelines#Community mailboxes.|
United Kingdom and the Republic of Ireland
|pillar||A freestanding box, taking the form of a column. Usually cylindrical in shape in the UK, but rectangular forms can also be seen.
|lamp||A self-contained box, smaller than a pillar box, and designed to be mounted above ground level. Usually attached to a pole, slim pedestal, lamp post, or telegraph pole in the UK, but can be mounted on (or very rarely within) a wall.
|wall||A box designed to be set into a wall. Can be found mounted in walls, walls of buildings, and also in free-standing brick pillars.
|meter||A special type of post box that was originally designed to only accept pre-paid business mail (known as "meter mail" or "franked mail" in the UK). The special adaptations may include a larger aperture and/or mechanisms to prevent unauthorised persons from using the box.
While this value is about the physical appearance/design of the box rather than the mail types accepted, it was normally used on boxes that only accepted this special type of mail.
In the UK these "meter" boxes are normally larger square pillar boxes with a larger mechanical aperture that is locked outside specified opening hours.
Since 2019 Royal Mail has changed the role of these meter boxes to also accept parcels, they added a "P" to the end of the reference, extended the opening hours of the box and stuck decorations on the to advertise that they now accepted parcels.
Since this classification is distinct from, and in some sense orthogonal to, the other post_box:type=* values, it has been suggested that a different key should be used for this attribute, leaving post_box:type=* to tag the box with the best fit from pillar, lamp, and wall.
The United States Postal Service operates multiple types of collection boxes.  As of November 2022, post_box:type=pillar is the most common value in the United States, most likely denoting any freestanding collection box.
Some boxes in Japan can be classified as either pillar or lamp.
However, most boxes are on the halfway between pillar and lamp.