Add your recipient's street address exactly below their name. Write to the Post Office box or the street address. If your address requires more than one line, enter your apartment or suite number on a separate line. Examples: Mary Smith 123 Main Street Apt. 303 Chicago, IL 60654 If you want the post office to use a specific slot for your mail, mark the top of the mailing label with a stamp or draw a picture of what goes in that slot. This will help the post office deliver your letter promptly. Do not write any other information on the box itself. That is where the address must be visible in order for the mail to reach its destination. Writing anything else on the box could lead the mail to be returned as undeliverable. You can write your address in many different ways. The most common example is a person's name followed by "address," but you can also write it as a business, organization, or group name followed by "address," or even just an initial and a city name together with an address. It is important to include all the necessary information in your writing. If you leave out any details, the post office may have trouble delivering your letter. Some names are hard to read.