CASS

CASS, or "Coding Accuracy Support System" standardizes addresses so that they conform with USPS guidelines for street address abbreviations, city name abbreviations, and zip codes. It also assigns zip+4 extended zip codes, carrier route information, and Line-Of-Travel information. The CASS software is currently using the CASS database dated 2010-02-15 with USPS AMS version 2.81.01.M.

If you're looking for Interlink bulk CASS processing service for Interlink Circulation Management subscribers, you need to login to the Client Center.

If you'd like to check it out, just type in the address above, and click the "check" button.