USPS Address Verification API Free

The USPS Address Verification API is a free tool that allows developers to access the official USPS address database. The USPS address database includes over 160 million addresses and also provides complete city details.



Getting Started with the Address Validation API

The first step is to create an account. This will provide you with an API key and a Web Tools ID, which you can use to make API calls.


Using the USPS Address Verification API can help businesses ensure that their mail is delivered to customers correctly and that they don't have to refund items sent to an incorrect address. Additionally, the service can help to improve customer satisfaction and reduce the cost of returned or undeliverable mail.


Overview of the USPS Address Verification API

The API accepts a string and then separates it into its individual components. It then validates these components and standardizes them to match the official USPS address format.


It can also identify missing or unconfirmed information in an address and correct it. It can do this by identifying errors in casing, abbreviations, and spelling or other typographical mistakes.


This can be used to help customers provide accurate addresses when making online purchases, sending packages, or entering their personal information. It can also be used to verify and standardize address data for business purposes.


The United States Postal Service (USPS) maintains the Coding Accuracy Support System (CASS) to certify providers of USPS-compliant address verification services. CASS-certified address validation providers fill in missing information, standardize addresses, and update them to keep them as current as possible.


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