Write the recipient’s full name on the first line
Write the PO Box number on the next line
Write the city, state, and ZIP code on the last line
Use the exact PO Box address provided by the recipient
Do not include a street address if sending to a PO Box
Place the recipient address in the center of the envelope
Put your return address in the upper left corner
Apply the correct postage
Drop the envelope in a mailbox or take it to the post office
Use a package service that delivers to PO Boxes if sending a parcel