This has been discussed before. I wouldn't say the zip codes are invalid. I would say the system audiogon uses to view zipcodes is outdated.
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I ship from my business address, so this is the zip code that I put in my ads. However, when payment is sent to me, I have it sent to my home, which is in a different zip code, so the payment does not get mixed up with my business mail. Strangely, none of my trading partners has ever brought this up.