Write the recipient’s full name on the first line
Write the company name on the second line, if applicable
Write the street address or P.O. box on the third line
Write the apartment, suite, or unit number on the same line as the street address or on the line above it
Write the city, state or province, and ZIP or postal code on the next line
Write the country on the last line for international mail
Place the return address in the upper left corner of the envelope
Place the postage stamp in the upper right corner of the envelope
Use clear, legible handwriting or printed text
Use all capital letters if required by the postal service
Avoid punctuation unless required by local mailing rules