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Each ZIP Code in the Address Management System has one preferred city name and may have one or more acceptable city names.

CASS-certified software accepts as standard any "preferred" or "acceptable" city for a five-digit ZIP Code.

AIS Viewer is updated monthly and the data is valid for 105 days from the product (monthly) cycle date. The following report/product options are available on the AIS Viewer application: The Address Lookup function is free with the purchase of at least one of the four other AIS Viewer products, which are priced separately, allowing mailers the flexibility to customize the AIS Viewer to their needs.

Choose personal account if you are interested in services for your home? order stamps, renew a Mail Box, mail a package, etc. The company information you submitted seems to be similar to one of our existing company records. We do not disclose your information to third parties without your consent, except to facilitate the transaction, to act on your behalf or request, or as legally required.An address with a ZIP 4 code (or nine-digit ZIP code) is considered to be valid.In most cases, this means that the address is deliverable.Please choose a default language for your USPS account.This can be changed at a later time from your preferences page.

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