You can use LACSLink to implement the USPS Locatable Address Conversion System (LACS) service. LACS is used to provide computerized address list correction for addresses in areas affected by rural route and box numbers to city-style address conversion, and city-style to city-style address conversions.
LACS provides mailers an automated method of obtaining new addresses when a 911 emergency system has been implemented. The 911 address conversions normally involve changing rural-style addresses to city-style addresses. In some instances, conversions may result in the renaming or renumbering of existing city-style addresses.
Note: USPS regulations require LACSLink processing for CASS certification.