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, and ZIP code on the next line
Write your return address in the top left corner
Place a stamp in the top right corner
Center the recipient’s address on the front of the envelope
Use clear, legible handwriting or printed text
Use the correct postage for the envelope size and weight