Here is the proper formatting for an address:
Mr. and Mrs. Frank Johnston
1234 Santa Monica Blvd., Apt. 2A
Los Angeles, CA 90067
The Names always go on the first line. For the second line you'll need to decide if you want to abbreviate all the street types or spell them out- "Boulevard" vs. "Blvd." If you are abbreviating make sure to put a period after the street type: St. Ln. Blvd. Etc.....
If there is an apartment,unit or suite number you'll need to put a comma after the street type. Usually the apartment number will appear on the second line.
On the third line the city a state should appear. There is always a comma between the city and state. You'll need to decide if you're going to spell out the state or abbreviate all of them.
The zip code can go on the third line or it can go by itself on a fourth line. Some calligraphers will space out the zip code on the fourth line to fill out the space.
Below are examples of formatting options for the same address.
Note: If you're NOT going to abbreviate the state, you should NOT abbreviate the street type. Either go casual, or formal. Try not to mix.
Mr. and Mrs. Frank Johnston
1234 Santa Monica Boulevard, Apt. 2A
Los Angeles, CA 90067
Mr. and Mrs. Frank Johnston
1234 Santa Monica Boulevard, Apt. 2A
Los Angeles, California 90067
Mr. and Mrs. Frank Johnston
1234 Santa Monica Boulevard, Apt. 2A
Los Angeles, California
9 0 0 6 7
