Mailbox vs. Pillar Box
In US English, “mailbox” can name a public container for outgoing letters as well as a private delivery box. A British “pillar box” is specifically the familiar tall public street posting box. They overlap only in the public-posting sense.
Use “pillar box” for the specific UK public street posting box. “Mailbox” is broader in US English and can refer either to a public posting container or a private delivery box.
Key details
Further guidance
Core difference
“Pillar box” is a specific UK public posting-box term; US “mailbox” covers public posting containers and private delivery boxes.
Fast Test
If the object is the classic public UK street box, “pillar box” is precise. In US contexts, “mailbox” is the ordinary broader term.
Usage Boundary
Do not translate every US “mailbox” as “pillar box”: a mailbox at someone’s home is not the same object.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- mailbox — Cambridge English Dictionary (opens in a new tab)Cambridge Dictionary · US mailbox senses, including public posting containers and private delivery boxes
- pillar box — Cambridge English Dictionary (opens in a new tab)Cambridge Dictionary · UK pillar box for the tall public street posting box