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How to Use a Post Office Address Lookup Tool

Invalid addresses will never be accepted by the US Postal Service (USPS). There are three steps to validating an address. The first step is to standardizedize the information. This will fix the errors that may occur in an address. This could include a house number that is not registered, a wrong street name or city, or missing information. The next step is to fill in any missing information that is know to be incorrect. A wrong address will be rejected if it is straight out incorrect.



There are several solutions to address validation. USPS provides an online service for this purpose, but most of them require manual input of the addresses. Third-party providers offer a more automated approach. They allow you to upload a list in Excel or CSV format and use an API to process it. Once you have the data, you can connect the tool to your business database to validate and update records. This way, you will only have to pay for the service if you are using it for mass mailing.

The next step involves comparing the standardized address to a list of valid addresses in the Address Management System. Various factors determine the validity of an address. These include renumbering through the USPS Locatable Adress Conversion System, completeness, and more. If a valid address does not exist, the system will use an acceptable alternative address. For example, 123 North Main Street, New York, NY 10010 is an apartment building with 100 apartments.


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