Write the recipient’s name on the first line
Write the street address or PO Box on the second line
If using a PO Box, write it as “PO Box [number]”
Include the city, state, and ZIP code on the last line
Use the exact PO Box format provided by the recipient
Do not add punctuation unless required by the address format
Place the return address in the upper left corner of the envelope or letter
Make sure the PO Box number is clear and accurate