What does the USPS verification do?

Clicking on the icon calls the USPS web page to verify the address. While this verification is not of course 100% accurate, it does catch and correct the following errors:

• Misspelled street or city name
• Incorrect zip code

In addition, if known, it will inform you of the following errors:

• Incorrect street number
• Incorrect or missing apartment number
• Incorrect or missing post office box number

It will also provide the zip+4 address. The USPS does use a number of abbreviations and normalizations so the generated address may look different than the supplied address. For instance "Street" is turned into "ST" and most directions such as "North" are turned into "N". These normalizations are not required for the successful delivery of your item.

While this does not guarantee the address is correct, it does do a number of checks that can catch typo's or other invalid or incomplete information.