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.

Data Files
Delivery Type Cycle N Static Data

This text file provides delivery type Cycle N static data

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

This application is for the CASS™ Summary Report.

Data Files
R9 RDI™ Cycle N Static Data

This zip file contains RDI 9-digit 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.

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.

Contact Lists
08/22/2019
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
08/22/2019
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
08/22/2019
RDI™ Current Cycle: Certified Products Guide (D)

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

Data Files
08/22/2019
Early Warning System (EWS002C0.ZIP)

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

Contact Lists
08/22/2019
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
08/22/2019
DSF2® Licensees Current Cycle: Certified Products Guide

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

Contact Lists
08/22/2019
DPV® Licensees Current Cycle: Certified Products Guide

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

Data Files
08/22/2019
Z4 Info File

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

Contact Lists
08/22/2019
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
08/22/2019
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).

Applications/ Forms
12/12/2018
Terms and Conditions document for Multiline Accuracy Support System (MASS™) Manufacturers

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

Applications/ Forms
12/12/2018
Terms and Conditions document for Multiline Accuracy Support System (MASS™) End-Users

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

Applications/ Forms
12/12/2018
Terms and Conditions document for Multiline Accuracy Support System (MASS™) End-Users

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

Applications/ Forms
12/12/2018
Terms and Conditions document for Multiline Accuracy Support System (MASS™) Manufacturers

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

Tech Guides
02/21/2018
Multiline Accuracy Support System (MASS™) Technical Guide for Cycle N

This documet provides a technical guide for MASS™ Cycle N. MASS™ is an extension of the CASS™ system.

Tech Guides
02/21/2018
Multiline Accuracy Support System (MASS™) Technical Guide for Cycle N

This documet provides a technical guide for MASS™ Cycle N. MASS™ is an extension of the CASS™ system.

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
Multiline Accuracy Support System (MASS™) Order Form

This is an order form to access the Multiline Accuracy Support System (MASS).

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

This order form allows customers to order the RDI™ 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
Z4Change Order Form

This order form is used to subscribe to the Z4Change 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
Multiline Accuracy Support System (MASS™) Order Form

This is an order form to access the Multiline Accuracy Support System (MASS).

Announcements
07/26/2017
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.

Applications/ Forms
11/01/2015
Electronic Product Fulfillment (EPF) Web Access Request Form

This form is used to create a Web-based account with the National Customer Support Center (NCSC) which will be utilized to retrieve/download files from the Electronic Product Fulfillment (EPF) website.

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

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

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.

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.

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.

Tech Guides
05/01/2006
Z4 Info File Layout

This data file presents a table of codes for primary and secondary numbers to describe Z4Info files.

Tech Guides
04/28/2005
Tech Guides
04/28/2005
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.