the city is also divided into postal code areas numbered between 10 and 99. postal codes for private residences in helsinki have the form "00xx0", where the initial '00' shows that the postal code is located in helsinki, the next two digits show the postal code area, and the final zero indicates that the code is for a private residence (post offices use the number one, and other numbers are set aside for large businesses that have their own postal codes). "(see also postal codes in finland.)"