> 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
