Write the recipient’s name on the center of the front of the envelope
Add the street address (including apartment/suite/unit number) on the line below the name
Add the city, state/province, and ZIP/postal code on the next line
Include the country name on the last line if mailing internationally
Put your return address in the top-left corner of the envelope
Format the return address as: your name, street address, city/state/ZIP, and country (if international)
Use a pen with clear, legible handwriting for all addresses
Place postage stamps in the top-right corner of the envelope
Ensure the address is centered and not covering the stamp area
If using a window envelope, place the recipient address so it appears exactly in the window area
Double-check spelling, ZIP/postal code, and apartment/unit numbers before sealing and sending