Address Standardization
The process of reformatting a mailing address to conform to USPS addressing standards, including approved abbreviations, directionals, and correct ZIP+4 assignment.
Address standardization (also called address normalization) converts a free-form address input into the USPS-preferred format. This includes parsing the address into components, applying standard abbreviations (STREET to ST, AVENUE to AVE), adding or correcting directionals (N, S, E, W), assigning the correct ZIP+4 code, and validating the secondary designator (APT, STE).
The USPS Publication 28 (Postal Addressing Standards) defines the official rules for address formatting. CASS-certified software implements these rules and is required for mailers claiming automation discounts.
Address standardization is also critical for database hygiene. Duplicate addresses entered in different formats ('123 Main Street Apt 4' vs '123 Main St #4') are recognized as the same address after standardization, enabling deduplication and accurate customer records.