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. All address records in an Interlink Circulation list are CASS processed as part of the list servicing that happens during the postal sort.
To check individual addresses instantly, try our online CASS Lookup, updated monthly with the latest address information directly from the USPS.
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