Locatable Address Conversion System

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.

A check of address using LACS is typically not performed by the USPS, but by 3rd 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.

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 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
Facilities	Air Mail Facility Boat Railway Post Office Community post office Dead letter office Highway Post Office J. W. Westcott II List of United States Post Offices National Postal Museum Network Distribution Center Railway mail service library Red Brick Roads Sectional center facility Streetcar Railway Post Office Terminal Railway Post Office
Legal	Comstock laws Post Office Act Postal Accountability and Enhancement Act Postal Reorganization Act Postal Service Act Private Express Statutes Rural Post "Good" Roads Act of 1916 Title 39 of the United States Code
Related	Airmails of the United States 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 The Mail Story 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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