Locatable Address Conversion System (LACS)

The USPS® Locatable Address Conversion System (LACS) corrects addresses that have changed as a result of a rural route address converting to street-style address, a PO Box renumbering, or a street-style address changing. The following are examples of LACS^Link conversions:

• Rural Route Converted to Street-Style Address: Old Address: RR 3 Box 45 New Address: 1292 North Ridgeland Drive
• Street Renamed and Renumbered: Old Address: 23 Main Street New Address: 45 West First Avenue
• PO Box Renumbered: Old Address: PO Box 453 New Address: PO Box 10435

LACS^Link is required for CASS processing.