Applications/ Forms
PS Form 3553: CASS™ Summary Report

This form is the CASS™ Summary Report.

Applications/ Forms
PS Form 3553: CASS™ Summary Report

This form is the CASS™ Summary Report.

Fact Sheets
Unique ZIP® Code Matrix

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

Fact Sheets
Unique ZIP® Code Flowchart

This flowchart describes the logic flow for Unique ZIP codes.

Data Files
03/14/2024
Z4 Info File

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

Contact Lists
03/14/2024
CASS™/MASS™ Certified Products Guide - All Sections Data Files Cycle O - (Expires July 31, 2028)

This document contains the certified vendors list for CASS™ and MASS™ products for Cycle O.

Contact Lists
03/14/2024
RDI™ Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)

This document outlines the CASS/MASS certified vendors list for RDI™ Cycle O.

Data Files
03/14/2024
Early Warning System (EWS002C0.ZIP)

This file is the EWS production file and is updated weekly. This file contains the Early Warning System data file for the CASS™ and MASS™ certification process.

Contact Lists
03/14/2024
RDI™ Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)

This document outlines the CASS/MASS certified vendors list for RDI™ Cycle O.

Data Files
03/14/2024
Z4 Info File

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

Contact Lists
03/14/2024
CASS™/MASS™ Certified Products Guide - All Sections Data Files Cycle O - (Expires July 31, 2028)

This document contains the certified vendors list for CASS™ and MASS™ products for Cycle O.

Data Files
03/14/2024
Early Warning System (EWS002C0.ZIP)

This file is the EWS production file and is updated weekly. This file contains the Early Warning System data file for the CASS™ and MASS™ certification process.

Tech Guides
09/25/2023
CASS™ Technical Guide for Cycle O

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 and deliverability of addresses for mail qualifying for postal discounts.

Data Files
09/07/2023
Contact Lists
04/20/2023
DSF2® Licensees Cycle N: Certified Products Guide - (Expires July 31, 2023)

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

Contact Lists
04/20/2023
DPV® Licensees Cycle N: Certified Products Guide - (Expires July 31, 2023)

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

Contact Lists
04/20/2023
CASS™ Software Manufacturers Data File Cycle N: Certified Products Guide (D) - (Expires July 31, 2023)

This document contains the CASS™/MASS™ certified vendors list for CASS™ software manufacturers for Cycle N.

Contact Lists
04/20/2023
DPV® Licensees Cycle N: Certified Products Guide - (Expires July 31, 2023)

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

Contact Lists
04/20/2023
CASS™/MASS™ Certified Products Guide - All Sections Data Files Cycle N - (Expires July 31, 2023)

This document contains the certified vendors list for CASS™ and MASS™ products for Cycle N.

Contact Lists
04/20/2023
CASS™ Software Manufacturers Data File Cycle N: Certified Products Guide (D) - (Expires July 31, 2023)

This document contains the CASS™/MASS™ certified vendors list for CASS™ software manufacturers for Cycle N.

Contact Lists
04/20/2023
CASS™ Software Manufacturers Cycle N - (Expires July 31, 2023)

This document contains the CASS™/MASS™ certified vendors list for CASS software manufacturers for Cycle N.

Contact Lists
04/20/2023
RDI™ Cycle N: Certified Products Guide (D) - (Expires July 31, 2023)

This document outlines the CASS/MASS certified vendors list for RDI™ Cycle N.

Contact Lists
04/20/2023
DPV® Licensees Data File Cycle N: Certified Products Guide (D) - (Expires July 31, 2023)

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

Contact Lists
04/20/2023
CASS™/MASS™ Certified Products Guide - All Sections Data Files Cycle N - (Expires July 31, 2023)

This document contains the certified vendors list for CASS™ and MASS™ products for Cycle N.

Contact Lists
04/20/2023
DPV® Licensees Data File Cycle N: Certified Products Guide (D) - (Expires July 31, 2023)

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

Contact Lists
04/20/2023
DSF2® Licensees Cycle N: Certified Products Guide - (Expires July 31, 2023)

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

Contact Lists
04/20/2023
CASS™ Software Manufacturers Cycle N - (Expires July 31, 2023)

This document contains the CASS™/MASS™ certified vendors list for CASS software manufacturers for Cycle N.

Contact Lists
04/20/2023
RDI™ Cycle N: Certified Products Guide (D) - (Expires July 31, 2023)

This document outlines the CASS/MASS certified vendors list for RDI™ Cycle N.

Fact Sheets
03/31/2023
Applications/ Forms
03/21/2023
RDI™ Order form

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

Applications/ Forms
03/21/2023
RDI™ Order form

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

Applications/ Forms
03/20/2023
CASS™ Order Form

This docoument contains the order form for CASS™.

Applications/ Forms
03/20/2023
Z4CHANGE Order Form

This order form is used to subscribe to the Z4CHANGE product. 

Applications/ Forms
03/20/2023
Z4CHANGE Order Form

This order form is used to subscribe to the Z4CHANGE product. 

Applications/ Forms
03/20/2023
CASS™ Order Form

This docoument contains the order form for CASS™.

Applications/ Forms
12/20/2022
Terms and Conditions for CASS™ End Users

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

Applications/ Forms
12/20/2022
Terms and Conditions for CASS™ Software Developers

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

Applications/ Forms
12/20/2022
Terms and Conditions for CASS™ End Users

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

Applications/ Forms
12/20/2022
Terms and Conditions for CASS™ Software Developers

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

Applications/ Forms
12/01/2022
Electronic Product Fulfillment (EPF) Web Access Request Form (PS 5116)

This form is used to create a Web-based account with the Addressing and Geospatial Technology (AGT) office which will be utilized to retrieve/download files from the Electronic Product Fulfillment (EPF) website.

Applications/ Forms
12/01/2022
Electronic Product Fulfillment (EPF) Web Access Request Form (PS 5116)

This form is used to create a Web-based account with the Addressing and Geospatial Technology (AGT) office which will be utilized to retrieve/download files from the Electronic Product Fulfillment (EPF) website.

Data Files
06/10/2022
Stage I Known Errors

The file contains known Stage I errors with a comment at the end of each record.

Announcements
04/26/2022
Modifications to TotalDPS – Programmers Specs file

Changes made to the Total DPS document

Fact Sheets
04/26/2022
TotalDPS – Programmer Specs

This document provides information for calculating TotalDPS.

Data Files
03/31/2022
CASS™ Cycle O - Stage I File

This file only contains CASS™ Cycle O enhancements.

Data Files
02/04/2022
DPV® & DSF2® Return Codes and Footnote Possibilities

This file contains sample addresses that include the DPV/DSF2 Return Codes and Footnotes.

Data Files
02/04/2022
Alpha Stage 1 File Analysis

This file contains only known errors in the Alpha Stage 1 File. The file has a Search functionality on the first record of the file on the “KEY” field. The search should include the 8-digit CASS key at positions 8-21 in the Alpha Stage 1 file.

Announcements
03/13/2019
Tech Guides
02/16/2018
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.

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).

User Guides
03/15/2016
Developer's Guide for 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
MASS™ Electronic Testing

This presentation provides information on electronic testing for MASS™.

Announcements
05/07/2013
CASS™ and MASS™ Cycle O Deferment Letter

This letter announces the deferment of CASS™/MASS™ Cycle O implementation.

Data Files
07/12/2012
R11 RDI™ Cycle M Static Data

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

Announcements
07/11/2012
Data Files
12/03/2010
CASS™ Cycle N Stage I File

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

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

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

Data Files
07/13/2010
Delivery Type Cycle N Static Data

This text file provides delivery type Cycle N static data

Data Files
07/08/2010
R9 RDI™ Cycle N Static Data

This zip file contains RDI 9-digit static data.

Data Files
07/08/2010
R11 RDI™ Cycle N Static Data

This zip file contains RDI 11-digit static data.

Fact Sheets
05/03/2010
CASS™ Cycle L Issues

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

Data Files
05/03/2010
EWS Data used with the NATLSTG1M.ZIP file

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

Data Files
05/03/2010
DPV® Vacant Table Cycle M Static Data

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

Presentations
05/03/2010
Data Files
05/03/2010
R9 RDI™ Cycle M Static Data

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

Data Files
05/03/2010
Enhanced Line of Travel (eLOT) Cycle M Static Data

This zip file contains static data for eLot Cycle M.

Fact Sheets
03/30/2010
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.

Presentations
03/30/2010
CASS™ Cycle N Partnership in Tomorrow Presentation

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

Announcements
10/29/2009
CASS™ and MASS™ Cycle N Deferment Letter

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

Presentations
04/28/2008
Announcements
07/13/2007
Licensing Announcement: 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
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.

Tech Guides
04/28/2005
Tech Guides
04/28/2005
Presentations
08/25/1999
2000-2001 CASS™ Meeting Minutes & Presentations

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