Write the recipient’s name on the first line
Write the company or organization name on the second line, if needed
Write “PO Box” followed by the box number on the next line
Write the city, state, and ZIP code on the last line
Use the exact PO Box format provided by the recipient
Do not include a street address if mailing to a PO Box
Place the recipient’s address in the center of the envelope
Place your return address in the top left corner