PROCESSING AND DISTRIBUTION - Billings, MT Processing and Distribution Center (P&DC) Machine Upgrade

Z4 Info File

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

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.

PROCESSING AND DISTRIBUTION - Update - Central Processing Region - Louisville, KY (PDC) Delays

DELIVERY - Westpac Area – Arizona – New Mexico District Blue Post Office – Temporarily Closed

DELIVERY - International Resumption of Mail Service - Effective November 6, 2026

November 15 2026 USPS Ship 31.0.0.0 Release Notes

Coming soon

November 15 2026 PostalOne! 64.1.3.0 Release Notes

Coming soon

Online Postage Due Permit Creation

Enterprise Payment System (EPS) User Guide

Online Permit Creation Fact Sheet

Enterprise Payment System (EPS) FAQs

The Enterprise Payment System or EPS allows customers to pay for products and services through an Enterprise Payment Account (EPA) funded as an Automated Clearing House (ACH) Debit or Trust Account. The EPS payment account management provides enhanced security features, centralized balance and account management, and a self-service customer experience.

PCCAC National Sub-Committee Leadership Transitions and Invitation to Join

PTR2 Release Notes_DD_11_05_26

PROCESSING AND DISTRIBUTION - Update - Indianapolis, IN Regional Processing and Distribution Center (RPDC) Delays

USPS APIs Release Notes

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

MTAC UG-WG-TT Leadership Roster and Matrix

October 2026 Nixie Volume

This spreadsheet contains the UAA statistics for October 2026.

INFORMATIONAL - Commercial System Releases – November 5, 2026

INFORMATIONAL - USPS APIs System Release Notification November 12

Destination Entry Service Standard Directory

Combined Service Standard Directory-PRI

Supplemental Service Standard Directory-PRI

Supplemental Service Standard Directory-PKG

Supplemental Service Standard Directory-PFC

Supplemental Service Standard Directory-PER

Supplemental Service Standard Directory-MKT

Supplemental Service Standard Directory-GAL

Supplemental Service Standard Directory-GAH

Supplemental Service Standard Directory-FCM

Combined Service Standard Directory-GAL

Combined Service Standard Directory-PKG

Combined Service Standard Directory-PFC

Combined Service Standard Directory-PER

Combined Service Standard Directory-MKT

Combined Service Standard Directory-GAH

Combined Service Standard Directory-FCM

3D Base Service Standard Directory

***Updated - New Areas*** - Area District 5-digit ZIP Codes (AREADIST_ZIP5.TXT)

PTR Domestic Scan Events and Descriptions

Automated Zone Indicator (AZI) Table

The AZI table lists each five-digit ZIP Code™ and is an indicator of the type of processing that typically takes place on letter mail destined for each ZIP Code. Each number in the file is a ZIP Code appended with a numeric zone indicator. The five numeric indicators are as follows:

1. Two Pass Zones: Automated two-step sector/segment at mail processing facilities
2. 876 Carrier Route Sort Zones: Automated incoming secondary carrier route sorting at plants
3. Carrier Route Barcode Sorter (CSBCS) Zones: Automated walk sequence sorting on CSBCS machines at delivery units
4. Delivery Barcode Sorter (DBCS) Zones: Automated walk sequence sorting on DBCS machines at plants [i.e., sectional center facilities (SCFs)] or at delivery units
5. Manual/Mechanized Zones: No automated sorting; no tracking code scans should be generated from facilities matched to these ZIP Codes

City/State ZIP Code Weekly Compare

3 Digit ZIP/AISU Office List (AISUREPT.TXT)

AIS Congressional District File (CONG_DIST.TXT)

AIS County Name Table Layout (AISCNTY.TXT)

AMS County Name Table (COUNTY_NAME_TABLE.TXT)

AMS Address Report: AISU Mailing List (ADDRREPT.TXT)

AISU ZIP Code Record and AISU Address Record Descriptions (AISULOUT.TXT)

AISU ZIP Code File (AISUZIPS.TXT)

AISU Contact Information (AISUADDR.TXT)