On the bottom center of the envelope, write the address you want your letter delivered to. Include the following on separate lines:
Recipient's full nameFull street addressCity, State, and ZIP CodeUsing the same format, write the return address in the top left corner.
Using the full ZIP+4 Code when mailing via the USPS ensures the fastest, most accurate mailing possible. If you are not sure of the full 9-digit ZIP Code, use the 5-digit ZIP Code to avoid loss of letter or package.
The recipient address information is provided for your reference.