LACS

Locatable Address Conversion System

A United States Postal Service (USPS) database that provides updated address information when a rural-style or outdated address has been converted to a city-style or standardized format. It is primarily used in support of emergency 911 services and USPS delivery efficiency, ensuring that mail is directed to the correct, modernized location.

As communities upgrade from rural route numbers (e.g., RR 2 Box 137) to physical street addresses (e.g., 123 Main St), the LACS system acts as a bridge between the old and the new. It enables mailers to automatically update mailing lists with the current address format through USPS-certified vendors.

LACS is a critical tool in both mail deliverability and address hygiene, particularly for businesses and organizations that rely on accurate mailing lists for billing, legal notices, marketing communications, and package delivery.

Key Features of LACS:

• Address Modernization: Converts rural and highway contract route addresses to a physical, 911-compliant street address, improving deliverability and public safety.
• Database Maintenance: Managed by the USPS and updated regularly, the LACS database ensures that address records reflect current street naming and numbering systems implemented by local authorities.
• LACSLink Integration: LACS data is accessed through the USPS LACSLink product, which allows certified mail processing software to update addresses in bulk without manual intervention.
• Improved Mail Accuracy: Reduces undeliverable-as-addressed (UAA) mail, lowering return rates and wasted postage for businesses.
• Compliance Requirement: For certain types of mail (e.g., presorted First-Class Mail and Standard Mail), using address correction tools like LACSLink may be required to qualify for discounted postage rates.
• Emergency Services Alignment: Ensures that mailing addresses are aligned with 911 emergency systems, facilitating faster response times and more accurate location identification during crises.

Use Cases for LACS

LACS is commonly employed by:

• Utility companies updating customer billing records after rural route conversion
• Banks and mortgage services ensure loan documents are sent to accurate physical addresses
• E-commerce businesses maintaining clean shipping address databases
• Government agencies synchronizing address records with county or emergency systems

Maintaining LACS-compliant address data is essential for good data stewardship, as it helps organizations remain USPS-compliant while enhancing customer communication outcomes.