Ms/Miss/Mrs/Mr/Dr … house number, street place area code COUNTRY (in capital letters)
In American English, the area code is usually at the same level as the place, separated by a comma.
Position: on the left
In British English, the recipient's address starts on the same line as the date or one line below the date.
In American English, the recipient's address starts two lines below the sender's address (or two lines below the date if the sender's address isn't placed in the top left corner).