Data Files
R11 RDI™ Cycle M Static Data

This zip file contains RDI 11-digit static data for Cycle M.

Fact Sheets
2007-2008 Coding Accuracy Support System (CASS™) Exception Process Cycle L

The CASS Cycle L implementation date will remain fixed at August 1, 2007. The Postal Service will, however, consider exception requests on a case-by-case basis for those companies with a compelling justification as to why they cannot meet the August 1, 2007 implementation date.

Fact Sheets
Known Issues with the June Stage 1 Beta File

This excel spreadsheet documents known issues with the Stage 1 File.

Applications/ Forms
PS Form 3553: Coding Accuracy Support System (CASS™) Summary Report

This application is for the CASS™ Summary Report.

Data Files
Enhanced Line of Travel (eLOT) Cycle M Static Data

This zip file contains static data for eLot Cycle M.

Data Files
R9 RDI™ Cycle M Static Data

This zip file contains RDI 9-digit static data for Cycle M.

Fact Sheets
2007-2008 Coding Accuracy Support System (CASS™) Cycle L Revised Fee Schedule

This document is to notify you that the fee schedule for 2007-2008, Cycle L has been revised.

Data Files
DPV® Vacant Table Cycle M Static Data

This data file provides static data for DPV® Vacant Table Cycle M.

User Guides
2007-2008 Coding Accuracy Support System (CASS™) Certification Requirements: A Mailer's Guide

This Mailer's guide discusses past, present, and future CASS software.

Data Files
EWS Data used with the NATLSTG1M.ZIP file

This zip file contains EWS data associated with the Stage 1 File. 

Applications/ Forms
PS Form 3553: Coding Accuracy Support System (CASS™) Summary Report

This application is for the CASS™ Summary Report.

Data Files
Delivery Type Cycle N Static Data

This text file provides delivery type Cycle N static data

Data Files
R11 RDI™ Cycle N Static Data

This zip file contains RDI 11-digit static data.

Fact Sheets
Unique ZIP® Code Flowchart

This flowchart describes the logic flow for Unique Zip code.

Data Files
R9 RDI™ Cycle N Static Data

This zip file contains RDI 9-digit static data.

Data Files
Coding Accuracy Support System (CASS™) Cycle N Stage I File

This zip file is for categories only processed with 2009-2011 Cycle N static data.

Fact Sheets
Unique ZIP® Code Matrix

The Unique ZIP Code Matrix dispays Carrier Route ID, Record Type, and Delivery Point assignment rules within unique zip codes only.

Contact Lists
08/15/2019
Coding Accuracy Support System (CASS™) Software Manufacturers Current Cycle

This document contains the CASS™/MASS™ certified vendors list for CASS software manufacturers current cycle.

Data Files
08/15/2019
Early Warning System (EWS002C0.ZIP)

This document contains the Early Warning System data file for the MASS™ certification process.

Contact Lists
08/15/2019
Coding Accuracy Support System (CASS™) Software Manufacturers Data File Current Cycle: Certified Products Guide (D)

This document contains the CASS™/MASS™ certified vendors list for CASS™ software manufacturers current cycle (D).

Contact Lists
08/15/2019
DPV® Licensees Data File Current Cycle: Certified Products Guide (D)

This document contains the CASS™/MASS™ certified vendors list for DPV® Licensees Data File Current Cycle (D).

Contact Lists
08/15/2019
RDI™ Current Cycle: Certified Products Guide (D)

This document outlines the CASS/MASS certified vendors list for RDI™ Current Cycle (D).

Contact Lists
08/15/2019
DPV® Licensees Current Cycle: Certified Products Guide

This document contains the CASS™/MASS™ certified vendors list for DPV® Licensees Curent Cycle.

Contact Lists
08/15/2019
DSF2® Licensees Current Cycle: Certified Products Guide

This document contains the CASS™/MASS™ certified vendors list for DSF2® Licensees Current Cycle.

Contact Lists
08/15/2019
Coding Accuracy Support System (CASS™) Software Manufacturers Data File Current Cycle: Certified Products Guide (D)

This document contains the CASS™/MASS™ certified vendors list for CASS™ software manufacturers current cycle (D).

Contact Lists
08/15/2019
DPV® Licensees Data File Current Cycle: Certified Products Guide (D)

This document contains the CASS™/MASS™ certified vendors list for DPV® Licensees Data File Current Cycle (D).

Contact Lists
08/15/2019
DPV® Licensees Current Cycle: Certified Products Guide

This document contains the CASS™/MASS™ certified vendors list for DPV® Licensees Curent Cycle.

Data Files
08/15/2019
Early Warning System (EWS002C0.ZIP)

This document contains the Early Warning System data file for the MASS™ certification process.

Contact Lists
08/15/2019
DSF2® Licensees Current Cycle: Certified Products Guide

This document contains the CASS™/MASS™ certified vendors list for DSF2® Licensees Current Cycle.

Contact Lists
08/15/2019
Coding Accuracy Support System (CASS™) Software Manufacturers Current Cycle

This document contains the CASS™/MASS™ certified vendors list for CASS software manufacturers current cycle.

Contact Lists
08/15/2019
RDI™ Current Cycle: Certified Products Guide (D)

This document outlines the CASS/MASS certified vendors list for RDI™ Current Cycle (D).

Data Files
08/15/2019
Z4 Info File

A downloadable ZIP file containing information related to the Z4 Info File.

Data Files
08/15/2019
Z4 Info File

A downloadable ZIP file containing information related to the Z4 Info File.

Contact Lists
08/15/2019
CASS™/MASS™ Certified Products Guide - All Sections Data Files Current Cycle

This document contains the certified vendor list for CASS™ and MASS™ products.

Contact Lists
08/15/2019
CASS™/MASS™ Certified Products Guide - All Sections Data Files Current Cycle

This document contains the certified vendor list for CASS™ and MASS™ products.

Announcements
03/13/2019
Applications/ Forms
12/11/2018
Terms and Conditions for Coding Accuracy Support System (CASS™) End Users

This document outlines the terms and conditions form for CASS™ end users.

Applications/ Forms
12/11/2018
Terms and Conditions for Coding Accuracy Support System (CASS™) Certification for Software Developers

This document outlines the terms and conditions form for CASS™ certification for developers.

Applications/ Forms
12/11/2018
Terms and Conditions for Coding Accuracy Support System (CASS™) End Users

This document outlines the terms and conditions form for CASS™ end users.

Applications/ Forms
12/11/2018
Terms and Conditions for Coding Accuracy Support System (CASS™) Certification for Software Developers

This document outlines the terms and conditions form for CASS™ certification for developers.

Tech Guides
02/16/2018
Coding Accuracy Support System (CASS™) Technical Guide for Cycle N

This document provides a technical guide for the CASS™ product. The CASS™ certification process is designed in cooperation with the mailing industry to improve the accuracy of addresses for mail qualifying for postal discounts.

Tech Guides
02/16/2018
Coding Accuracy Support System (CASS™) Technical Guide for Cycle N

This document provides a technical guide for the CASS™ product. The CASS™ certification process is designed in cooperation with the mailing industry to improve the accuracy of addresses for mail qualifying for postal discounts.

Applications/ Forms
09/21/2017
RDI™ Order form

This order form allows customers to order the RDI™ product.

Applications/ Forms
09/21/2017
Enhanced Line of Travel (eLOT) Order Form

This document provides an order form for eLOT.

Applications/ Forms
09/21/2017
Z4Change Order Form

This order form is used to subscribe to the Z4Change product. 

Applications/ Forms
09/21/2017
Coding Accuracy Support System (CASS™) Order Form

This docoument contains the order form for CASS™.

Applications/ Forms
09/21/2017
RDI™ Order form

This order form allows customers to order the RDI™ product.

Applications/ Forms
09/21/2017
Z4Change Order Form

This order form is used to subscribe to the Z4Change product. 

Applications/ Forms
09/21/2017
Coding Accuracy Support System (CASS™) Order Form

This docoument contains the order form for CASS™.

Announcements
07/26/2017
Publications
03/31/2017
Postal Addressing Standards for Puerto Rico and US Virgin Island (English)

Postal Addressing Standards for Puerto Rico and US Virgin Island (English).

Publications
03/31/2017
Postal Addressing Standards for Puerto Rico and US Virgin Island (Spanish)

Postal Addressing Standards for Puerto Rico and US Virgin Island (Spanish).

Data Files
12/19/2016
PBSA Address-Box Range Report (12/19/16)

A text file report detailing the status for all PBSA (Post Office Box Street Address) ZIP codes.

User Guides
03/15/2016
Developer's Guide for Coding Accuracy Support System (CASS™) Vendors

This document provides a vendor's guide for CASS™ development.

Publications
03/07/2016
Domestic Mail Manual (DMM®) 509: Address Information System Products

Address Management provides services that enable customers to manage thequality of their mailing lists while maximizing the Postal Service's ability to efficiently deliver mail.

Presentations
10/10/2014
Multiline Accuracy Support System (MASS™) Electronic Testing

This presentation provides information on electronic testing for Multiline Accuracy Support System (MASS).

Announcements
05/07/2013
Announcements
07/11/2012
Fact Sheets
07/10/2012
2009-2010 Coding Accuracy Support System (CASS™) Cycle M LACSLink® Printing Guidelines

This document provides guidelines for printing LACSLink® information.

Fact Sheets
07/10/2012
2007-2008 Coding Accuracy Support System (CASS™) Stage I File New Things To Look For

This fact sheet provides new requirements and "things to look for" in the Stage 1 File.

Data Files
07/16/2010
Early Warning System (EWS) Cycle N Static Data

This zip file contains Early Warning System Data for Cycle N.

Presentations
05/03/2010
Fact Sheets
05/03/2010
Coding Accuracy Support System (CASS™) Cycle L Issues

This document provides policy clarifications to CASS Cycle L requirements that have been identified.

Presentations
03/30/2010
Coding Accuracy Support System (CASS™) Cycle N Partnership in Tomorrow Presentation

This Partnership in Tomorrow presentation reviews CASS/MASS Cycle M and N requirements.

Fact Sheets
03/30/2010
Coding Accuracy Support System (CASS™) Cycle N Partnership in Tomorrow Minutes

The Partnership in Tomorrow Meeting was hosted by the National Customer Support Center in Memphis, TN with attendees and webinar participants from various industry representatives.

Announcements
10/29/2009
Coding Accuracy Support System (CASS™) and Multiline Accuracy Support System (MASS™) Cycle N Deferment Letter

The implementation date for CASS/MASS Cycle N is being deferred to August 1, 2011.

Presentations
04/28/2008
Fact Sheets
04/22/2008
1997-1998 Coding Accuracy Support System (CASS™) Update Secondary Delivery Point

This document discusses delivery point codes for highrise secondary addresses.

Announcements
07/13/2007
Licensing Announcement: Coding Accuracy Support System (CASS™) Cycle L Reminder

As a reminder, the CASS™ 2006-2007 (Cycle K) version of the AMS API Product ceased to function effective August 1, 2007.

FAQs
06/04/2007
Coding Accuracy Support System (CASS™) 2007-2008 Certification Requirements FAQ

This document lists frequently asked questions for CASS™ Cycle L.

Quick Service Guides
10/06/2006
DPV®, DSF2®, CASS™ Grading Requirements

This document contains grading requirements for DPV®, DSF2®, and CASS™ products.

Fact Sheets
02/06/2006
2007-2008 Coding Accuracy Support System (CASS™) Cycle L Minutes

Revised Cycle L requirements now contain requirements for LACSLink™. Also included are additional questions and answers from the CASS™ Web Cast meeting minutes.

Applications/ Forms
11/01/2005
2007-2008 Coding Accuracy Support System (CASS™) Cycle L File Layouts

Cycle L File Layouts: Includes CASS™ & MASS™ Order Form, CASS™ Internet Applications, and 3553

Applications/ Forms
11/01/2005
2006-2007 Coding Accuracy Support System (CASS™) Stage File Description

Cycle K File Description includes CASS™ & MASS™ Order Form, CASS™ Internet Applications, and 3553.

Tech Guides
04/28/2005
Tech Guides
04/28/2005
Fact Sheets
10/15/1999
2000-2001 Coding Accuracy Support System (CASS™) New Subcategories

The following is a list of the new subcategories, along with some specifically affected existing subcategories, that will be make up the new requirements of the CASS 2000-2001 cycle.

Presentations
08/25/1999
2000-2001 Coding Accuracy Support System (CASS™) Meeting Minutes & Presentations

This zip file contains the 2000-2001 CASS™ Partnership in Tomorrow presentation and meeting minutes.

Presentations
12/14/1998
1999-2000 Coding Accuracy Support System (CASS™) Meeting Minutes & Presentations

This zip file contains CASS™MASS™ presentations and meeting minutes from the Partnership in Tomorrow meeting from December 14, 1998, as well as the CASS™ Summary Report Form.