English version

PO Box in Mail topic

From Longman Dictionary of Contemporary EnglishPO BoxPO Box British English, P.O. Box American English /ˈpiː əʊ bɒks $ -oʊ bɑːks/ noun [countable]  TCM (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.
Examples from the Corpus
PO BoxBrochures available from Glasgow 1990, PO Box 88, Glasgow.You write to a PO box with your photo and telephone number, and they contact you if they're interested.