Locatable Address Conversion System

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Locatable Address Conversion System (LACS) is a service offered by the United States Postal Service to update mailing addresses when a street is renamed or the address is updated for 911. In the case of 911, the address is changed from a rural route format to an urban/city route format. E.G. RR 2 BOX 8, SOME CITY, TX would become 2601 BELMONT DR, SOME CITY, TX.^[1]

A check of address using LACS is typically not performed by the USPS, but by third parties who license the LACS data from the USPS. A licensee will create or purchase software to perform the LACS check and receive monthly or bi-monthly updates of LACS data from the USPS.

References

^ LACSLink and Rural Routes Converted to 9-1-1 Addresses

v t e United States Postal Service
Organizations	American Letter Mail Company American Postal Workers Union Board of Governors of the United States Postal Service Bureau of Transportation Citizens' Stamp Advisory Committee National Alliance of Postal and Federal Employees National Association of Letter Carriers National Association of Presort Mailers National Postal Mail Handlers Union National Rural Letter Carriers' Association Postal Regulatory Commission Postal Transportation Service PostalWatch Incorporated United States Postal Inspection Service United States Postal Service Office of Inspector General
Systems	Address Management System Advanced Facer-Canceler System Coding Accuracy Support System Delivery Bar Code Sorter Flats Sequencing System Locatable Address Conversion System United States Postal Savings System
Services	Click-N-Ship Express mail in the United States National Change Of Address Permit mail Permit Reply Mail Postal notes Railway Mail Service Registered mail Special Delivery Special handling
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Legal	Comstock Act of 1873 Post Office Consolidation Act of 1872 Postal Accountability and Enhancement Act of 2006 Postal Reorganization Act of 1970 Postal Service Act of 1792 Postal Service Reform Act of 2022 Private Express Statutes Rural Post Roads Act of 1916 Title 39 of the United States Code
Related	2020 United States Postal Service crisis United States airmail service CAR-RT SORT Catcher pouch Cimarron Redoubt Domestic Mail Manual Facing Identification Mark Flats Grumman LLV Information-Based Indicia The Inspectors Intelligent Mail barcode Label 228 List of postal killings List of U.S. state abbreviations List of United States airmail stamps Mail bag Mail cover Mail hook Mail Isolation Control and Tracking Mail jumping Mail pouch Mail sack Mail satchel Nixie ORM-D Owney (dog) Pony Express mochila Postage stamps and postal history of the United States Postal Alpha Numeric Encoding Technique Postal Clause Postal voting in the United States Postal worker Postmaster General Prohibitory Order Remote Bar Coding System Rural Free Delivery Rural letter carrier STD-4C United States post office murals List of murals USPS Post Office Box Lobby Recycling program United States Postal Service creed

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Locatable Address Conversion System

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