DELIVERY - Nespelem Post Office, 99155 - Temporarily Closed

PS Form 3500 Application For Periodicals Mailing Privileges

PS Form 3500 presentation for completing and submitting the application to the PCSC.

INFORMATIONAL - Commercial System Release – July 17, 2026

DELIVERY - Antelope Post Office - Temporarily Closed

PTR2 Release Notes_DD_07_16_26

Known Issues List 7.17.2026

NCOALink® Software Developer License Agreement v29 (7/15/2026)

This agreement licenses the development of software interfaces for the NCOA^Link® product.

NCOALink® End User License Agreement v30 (7/15/2026)

This agreement licenses the use of the NCOA^Link® product to an "End User Licensee".

NCOALink® Software Interface Distributor License Agreement v30 (7/15/2026)

The software agreement for NCOA^Link® governs the distribution of licensee's certified NCOA^Link® software interface.

NCOALink® Limited Service Provider License Agreement v30 (7/15/2026)

This agreement licenses the use of the NCOA^Link® product to a "Limited Service Licensee".

Modifications to NCOALink® Licenses

This document provides information on modifications to NCOA^Link® licenses.

NCOALink® Full Service Provider License Agreement v36 (7/15/2026)

This agreement licenses the use of the NCOA^Link® product to a "Full Service Licensee".

LACSLink® End User License Agreement

This document contains the End User License Agreement for LACS^Link®.

Licensing Fees

This document contains information about licensing fees for USPS^® Licensed Products.

Address Matching System API (AMS API) Licensing Fees

This document outlines the AMS API prorated fee structure. License fees are prorated for the initial license year with a license year beginning October 1 and ending September 30.

DELIVERY - Trail Post Office - Temporarily Closed

DELIVERY - Weston Post Office - Temporarily Closed

INFORMATIONAL - Expansion of Daily Webinar Series through September 4, 2026

July 17, 2026 Customer Onboarding Portal R2.5.4.0

DELIVERY - Eureka Post Office – Resume Operations

USPS APIs Release Notes

For the latest updates, please review the USPS APIs Release Notes.

CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)

RDI™ Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)

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

CASS™ Certified Products Guide: M L O C R Mailers/Users Data File Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: M L O C R Mailers/Users Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: M L O C R Service Bureaus Data File Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: M L O C R Service Bureaus Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: M L O C R Hardware Manufacturers Data File Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: M L O C R Hardware Manufacturers Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: Z4CHANGE Data File Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: Z4CHANGE Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: Vendor/Service Licensees Data File Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: Vendor/Service Bureaus Licensees Cycle O - (Expires July 31, 2028)

CASS™ Certified Products Guide: DSF2® Licensees Data File Cycle O - (Expires July 31, 2028)

DSF2® Licensees Cycle O: Certified Products Guide - (Expires July 31, 2028)

DPV® Licensees Data File Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)

DPV® Licensees Cycle O: Certified Products Guide - (Expires July 31, 2028)

CASS™ Software Manufacturers Data File Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)

CASS™ Software Manufacturers Cycle O - (Expires July 31, 2028)

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.

Mail Processing Equipment (MPE) Data User License Agreement

This agreement licenses the use of the NCOA^Link Product with Mail Processing Equipment.

Modifications to NCOALink® MPE Licenses and Supporting Documents (7/14/2025)

This document provides information on licenses and supporting documents for Mail Processing Equipment for NCOA^Link®.

MPE Developer License

This agreement licenses the development of software interfaces for the NCOA^Link® Mail Processing Equipment. 

DPV® License Agreement

This document contains the License Agreement for DPV^®.

MPE Interface Distribution License Agreement

This agreement governs the distribution of licensee's certified NCOA^Link® mail processing equipment software interface.

Z4 Info File

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

Modifications to LACSLink® Licenses and Supporting Documents

This document lists modifications to LACS^Link® licenses and supporting documents.

LACSLink® Software Distribution License Agreement

This document contains the licensee agreement for LACS^Link® software distribution.

LACSLink® Developer License Agreement

This document contains the developer license agreement for LACS^Link®.

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.