> Are there any other possible formats for phone / fax?
All normal numbers (this includes mobile and toll-free numbers) are 10
digits consisting of 3 digit area code + 3 digit local exchange + 4 digit
number.
> Is the 9 digit ZIP code an official code and every city/locations does have
> such a 9 digit code or are the 4 additional digits 'optional'.
>
> Also is there an official rule concerning the leading 2-character state?
The state abbreviation is not part of a ZIP code.
All you ever wanted or didn't want to know about ZIP codes can be found
at http://www.usps.com/zip4/zipfaq.htm
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