• USPS - Redirect to http://zip4.usps.com/zip4/welcome.jsp
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• ZIPskinny - Get the Skinny on that ZIP
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• USPS - ZIP Code Lookup - Search By Address
  
  Look up a ZIP code.
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  By rrhobbs in Public bookmarks with lookup reference search tools usps zip zipcode by 22 users
• USPS Zip Code Map
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• Address Finder, Area Code Search, Street Address Finder, Lookup Street Address Finder, Mailing Address Finder
  
  Free Lookups at Melissa Data. Specializing in area code searches, street address finders, lookup street address finders and mailing address finders. Also includes maps of ZIP Codes, counties, carrier routes, and cities.
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  By loriborealis in Public bookmarks with address distance info reference search tools zipcode by 9 users
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• Guide to Using XMLHttpRequest (with Baby Steps) from WebPasties
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• zipdecode | ben fry
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