Write the recipient’s full name on the first line
Write the street address or P.O. box on the second line
Write the apartment, suite, or unit number if needed 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 if mailing internationally
Place the address in the center of the envelope
Write the return address in the top-left corner
Use clear, legible print
Use black or blue ink
Avoid abbreviations unless they are standard postal abbreviations