Unique ZIP® Code Flowchart
This flowchart describes the logic flow for Unique ZIP codes.
PS Form 3553: CASS™ Summary Report
This form is the CASS™ Summary Report.
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.
09/25/2023
MASS™ Technical Guide for Cycle O
This document provides a technical guide for MASS™ Cycle O. MASS™ is an extension of the CASS™ system.
09/25/2023
MASS™ Technical Guide for Cycle O
This document provides a technical guide for MASS™ Cycle O. MASS™ is an extension of the CASS™ system.
09/21/2023
Z4 Info File
A downloadable ZIP file containing information related to the Z4 Info File
09/21/2023
09/21/2023
09/21/2023
09/21/2023
09/21/2023
09/21/2023
09/21/2023
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.
09/21/2023
Early Warning System (EWS002C0.ZIP)
This file contains the Early Warning System data file for the CASS™ and MASS™ certification process.
09/21/2023
09/21/2023
09/21/2023
09/21/2023
09/21/2023
09/21/2023
04/20/2023
04/20/2023
04/20/2023
04/20/2023
04/20/2023
04/20/2023
CASS™/MASS™ Certified Products Guide - All Sections Data Files Current Cycle - (Expires July 31, 2023)
This document contains the certified vendors list for CASS™ and MASS™ products.
04/20/2023
04/20/2023
04/20/2023
04/20/2023
RDI™ Current Cycle: Certified Products Guide (D) - (Expires July 31, 2023)
This document outlines the CASS/MASS certified vendors list for RDI™ Current Cycle (D).
04/20/2023
DPV® Licensees Current Cycle: Certified Products Guide - (Expires July 31, 2023)
This document contains the CASS™/MASS™ certified vendors list for DPV® Licensees Current Cycle.
04/20/2023
04/20/2023
04/20/2023
DSF2® Licensees Current Cycle: Certified Products Guide - (Expires July 31, 2023)
This document contains the CASS™/MASS™ certified vendors list for DSF2® Licensees Current Cycle.
04/20/2023
04/20/2023
CASS™ Software Manufacturers Current Cycle - (Expires July 31, 2023)
This document contains the CASS™/MASS™ certified vendors list for CASS software manufacturers current cycle.
04/20/2023
04/20/2023
04/20/2023
CASS™ Software Manufacturers Data File Current Cycle: Certified Products Guide (D) - (Expires July 31, 2023)
This document contains the CASS™/MASS™ certified vendors list for CASS™ software manufacturers current cycle (D).
04/20/2023
04/20/2023
04/20/2023
DPV® Licensees Data File Current Cycle: Certified Products Guide (D) - (Expires July 31, 2023)
This document contains the CASS™/MASS™ certified vendors list for DPV® Licensees Data File Current Cycle (D).
04/20/2023
CASS™/MASS™ Certified Products Guide - All Sections Data Files Current Cycle - (Expires July 31, 2023)
This document contains the certified vendors list for CASS™ and MASS™ products.
04/20/2023
03/21/2023
RDI™ Order form
This order form allows customers to order the RDI™ product.
03/20/2023
CASS™ Order Form
This docoument contains the order form for CASS™.
03/20/2023
Z4CHANGE Order Form
This order form is used to subscribe to the Z4CHANGE product.
03/17/2023
MASS™ Order Form
This is an order form to request a test deck for MASS™ certification/recertification.
03/17/2023
MASS™ Order Form
This is an order form to request a test deck for MASS™ certification/recertification.
12/20/2022
Terms and Conditions document for MASS™ End-Users
This document outlines the terms and conditions form for MASS™ certification for end users.
12/20/2022
Terms and Conditions document for MASS™ End-Users
This document outlines the terms and conditions form for MASS™ certification for end users.
12/20/2022
Terms and Conditions document for MASS™ Manufacturers
This document outlines the terms and conditions form for MASS™ certification.
12/20/2022
Terms and Conditions document for MASS™ Manufacturers
This document outlines the terms and conditions form for MASS™ certification.
12/01/2022
Electronic Product Fulfillment (EPF) Web Access Request Form
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.
11/07/2022
11/07/2022
02/21/2018
MASS™ Technical Guide for Cycle N
This document provides a technical guide for MASS™ Cycle N. MASS™ is an extension of the CASS™ system.
02/21/2018
MASS™ Technical Guide for Cycle N
This document provides a technical guide for MASS™ Cycle N. MASS™ is an extension of the CASS™ system.
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.
09/21/2017
Enhanced Line of Travel (eLOT) Order Form
This document provides an order form for eLOT.
07/26/2017
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.
10/10/2014
MASS™ Electronic Testing
This presentation provides information on electronic testing for MASS™.
10/10/2014
MASS™ Electronic Testing
This presentation provides information on electronic testing for MASS™.
05/07/2013
CASS™ and MASS™ Cycle O Deferment Letter
This letter announces the deferment of CASS™/MASS™ Cycle O implementation.
07/12/2012
07/11/2012
06/26/2012
12/03/2010
CASS™ Cycle N Stage I File
This zip file is for categories only processed with 2009-2011 Cycle N static data.
07/13/2010
Delivery Type Cycle N Static Data
This text file provides delivery type Cycle N static data
07/08/2010
R11 RDI™ Cycle N Static Data
This zip file contains RDI 11-digit static data.
07/08/2010
R9 RDI™ Cycle N Static Data
This zip file contains RDI 9-digit static data.
05/03/2010
05/03/2010
05/03/2010
05/03/2010
03/30/2010
CASS™ Cycle N Partnership in Tomorrow Presentation
This Partnership in Tomorrow presentation reviews CASS/MASS Cycle M and N requirements.
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.
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.
05/01/2006
Z4 Info File Layout
This data file presents a table of codes for primary and secondary numbers to describe Z4Info files.
04/28/2005
04/28/2005
08/22/2000
08/25/1999
2000-2001 CASS™ Meeting Minutes & Presentations
This zip file contains the 2000-2001 CASS™ Partnership in Tomorrow presentation and meeting minutes.