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Postal Resources

Semaphore's Internet Databases has a zip+4 database that can take a partial address and give you the complete address as well as neighbors' addresses.

 

USPS Address Quality & ZIP Code Lookup lets you verify an address.

 

Searchbug has Zip Codes and Verify Address.

 

Canadian Postal Lookup by Westminster lets you verify Canadian and American addresses.

 

The National Address Server will check the name and address and correct mistakes.