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 on the same line as the street address if needed
Write the city, state, and ZIP code on the third line
Write the return address in the top left corner
Place the postage stamp in the top right corner
Center the recipient’s address on the front of the envelope
Use clear, legible handwriting or print neatly
Use black or blue ink
Include the country name on the last line for international mail