PO Box British English,
P.O. Box American English /ˈpiː əʊ bɒks $ -oʊ bɑːks/
noun [countable] (post office box) used before a number as an address at a post office where letters to you can be sent:
Write to P.O. Box 714, Key Largo, Florida. [TahlilGaran] Dictionary of Contemporary English ▲