Business, tax and funding
PO
Abbreviation for post office
In short and in plain language
PO stands for post office, as in a PO box.
Such a box is a mailbox at a post office or a mail service.
Letters and parcels go there instead of to a street address.
Definition
PO stands for post office. A PO box is a mailbox at a post office or mail service to which items are delivered instead of to a street address.