Zip Code Companion is a utility with a database of all postal codes of the United States. It is very convenient because it allows you to find or verify postal codes in a glance. It is also possible to find cities, states and other area codes in the United States. It is very easy to use because you can type information and it shall provide all the other missing ones. It is also able to provide telephone prefixes and the time in a particular state or city. It is really easy to implement and manipulate. Its interface is really simple but effective. It is compatible with Windows XP and NT/95/98/2000/ME.