How to Address to a PO Box: 10 Steps (with Pictures) - wikiHow

USPS shows you how to send a letter or postcard in the U.S., from choosing an envelope, writing the address, buying and applying stamps, and finding a drop-off location.

How to Prepare & Send a Package | USPS

Proper Way to Include Both PO Box & Street Address on Mail | Synonym

Can you use a PO box as your main address?

Steps For Getting a PO Box With USPS