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Business yellow pages.
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Canada Post Bienvenue à Postes Canada
Postal rates & codes, etc.
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Postal codes, etc.
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Dragon Software U.S. Zip Code Database Search Service
Online searchable databases providing zip codes by city, zip codes by state & cities by zip code.
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[The original link is broken. This link points to an archived copy on the Wayback Machine]
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Westminster - Canadian Postal Code Lookup Service
Also has U.S. Zip codes.
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Service which provides location information for localities, organizations and companies in Luxembourg.