Locatable Address Conversion System
LACS Ensures Mailing List Delivery

Locatable Address Conversion System - LACS - is an important factor in updating your mailing lists. When local authorities convert addresses, your mailing list database can become obsolete. Street renaming and address renumbering create havoc with your mailing list. 911 government mandates convert rural-style addresses to city-style address systems. Cities, counties, and states are constantly changing street names. Wholesales changes in addresses can impact your mailing list data overnight, resulting in massive undeliverable mail to your customers.

Avoid the LACS Time Bomb By Updating Your Mailing Lists

The Postal Service will deliver to old style address for one year after an LACS conversion goes into effect. However, after the one year time frame - your list is out of date - you have undeliverable addresses. Avoid this time bomb! NW Database Service uses LACS to ensure your mailing list deliverability. Our LACS service identifies potential duplicates with original addresses and compares them to records in your list that are using new converted address.

NW Database Service uses Locatable Address Conversion System codes for optimizing your mailing list data. We include this in our National Change Of Address System services, and we also use the Address Change Service - ACS - processing. By using all these services we deliver the most accurate mailing list data to you.

Northwest Database Services specializes in LACS services. We have over 15 years experience working with the USPS Information Center.
Contact us at 360-841-8168 for immediate service, or
Send an email to Yes, I need LACS Service.