Start with the recipient’s full name
Write the apartment number before the street address
Include the building number and street name
Add the city, state, and ZIP code on the next line
Use the correct apartment format, such as Apt, Apartment, Unit, or #, depending on the address style
Keep the address aligned and easy to read
Use uppercase letters if required by the mailing format
Double-check the apartment number for accuracy
Place the apartment number on the same line as the street address when possible
Follow the specific format required by the postal service or delivery company