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USPS® Address Validator and Address Lookup Tool

USPS Valid Address

What is USPS address verification and validation? 


A USPS® valid address is an address that abides by United States Postal Service standards and formatting.

Ensuring that an address is a USPS® valid address is an important step in reducing amounts of returned mail and improving mail delivery time.

When addressing mail within the United States, it is important to adhere to the USPS® valid address format. While many believe that they know the appropriate way to address an envelope or package, a USPS® valid address has features that are not commonly followed by the majority of mail senders.

A USPS® valid address contains the following:

  • All capital letters
  • A valid and deliverable address
  • Included company name, apartment number, or suite number if applicable
  • Valid USPS® acronyms and abbreviations
  • A valid ZIP+4®
  • No commas or periods

The example below shows a USPS® valid address:

123 N MAIN ST STE 45 
BOSTON MA 02110-1615

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Related links:

Read more about USPS® address list software. 

See what our USPS address verification software can do for your business.

Read more about ZIP + 4®.

Try out our address lookup tool and see for yourself.