PostCheck is a plugin for Apple's Address Book. PostCheck requires Mac OS X 10.4 or higher and is a Universal Binary (it'll work with both PowerPC and Intel-based Macs). Currently PostCheck only works with addresses in the United States.
Download the Demo —
PostCheck Demo.zip (165 KB — May 15, 2008 — v1.8.2)
» Demo version is limited to 5 address lookups.
» Batch lookups are not supported in the demo.
Be more productive with PostCheck.
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Is an address missing a ZIP Code? Do you know the ZIP Code, but you're not sure what city it's for? Look up your missing address information with a single click, rather than visiting USPS.com each time. PostCheck will also reformat an address to conform to the United States Post Office standards. PostCheck is a great addition to the Google Maps Plugin! |
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Find ZIP Codes.
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If your street address has a valid city and state, PostCheck will lookup and enter the ZIP+4 Code (or simply the ZIP Code if you prefer.) |
 
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Find cities and states.
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Given a valid ZIP Code, PostCheck will lookup and enter the corresponding city and state for the address. |
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Verify and standardize.
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The USPS has certain standards for how addresses should be formated: Apartment Number, Suite, etc. Street Address City, Two-Character State, ZIP CodePostCheck will format your addresses the best it can to conform to these standards. |
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