ZIP Codes by Area and District codes

The Excel spreadsheet lists ZIP Codes with the associated Area and District Codes.  

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

INFORMATIONAL - USPS APIs System Patching Notification – September 5 and 6, 2026

DELIVERY - Big Sur Post Office – Resumes Operations

INFORMATIONAL - Commercial System Releases – Week of September 12, 2026

Enterprise Payment System (EPS) Release Notes-September 13, 2026

INFORMATIONAL - USPS APIs System Deployment – September 13, 2026

INFORMATIONAL - USPS APIs System Deployment [CR# TBD] – September 12, 2026

INFORMATIONAL - USPS APIs System Deployment – September 6, 2026

PROCESSING AND DISTRIBUTION - USPS Modernization Through Package Equipment Upgrades in September 2026

PROCESSING AND DISTRIBUTION - Update - Western Region - Beaumont, TX - Tropical Storm Edouard Impacts

Provisioning EMAS API Invoices Data in Informed Visibility® Mail Tracking & Reporting (IV®-MTR)

This guide provides instructions for receiving EMAS API Invoices data through the IV Mail Tracking & Reporting application.

National Change of Address - API

USPS PTR2 API Known Issues

Provisioning Informed Delivery® Post-Campaign (IDPC) Data in Informed Visibility® Mail Tracking & Reporting (IV®-MTR)

This guide provides instructions for receiving Informed Delivery Post-Campaign (IDPC) detailed data through the IV Mail Tracking & Reporting (IV-MTR) application. Instructions include how to access the application, create a one-time query, create and manage a data feed, manage the address book, and manage data delegation.

Orientation Training for Informed Visibility® - Mail Tracking & Reporting (IV®-MTR)

This presentation provides an introduction to the IV-MTR application, including its purpose, user access, layout, navigation controls, and support resources.

Provisioning Mail Quality Data with Informed Visibility® Mail Tracking and Reporting

Mail Quality Data (MQD-IV) leverages the Informed Visibility^® Mail Tracking & Reporting (IV^®-MTR) application to enable mailers to receive uncapped Mail Quality Data. Detailed error data from the Mailer Scorecard is available for Full Service, Move Update, eInduction, and Seamless Acceptance.

Provisioning Enterprise Payment (EPS) and USPS Ship (formerly Package Platform (PPC)) Data through Informed Visibility® (IV®)

This guide provides instructions for receiving Enterprise Payment System (EPS) and USPS Ship (formerly Package Platform Concept (PPC)) data through the IV Mail Tracking & Reporting (IV-MTR) application. Instructions include how to get access, create and manage a data feed, manage the address book, and manage data delegation.

Informed Visibility® Mail Tracking & Reporting (IV®-MTR) User Guide

The User Guide describes the prerequisites for receiving mail tracking data through IV-MTR, the data provisioning options available, and how to use the application for tracking commercial domestic-bound barcoded letters and flats.

Informed Visibility® Mail Tracking & Reporting (IV®-MTR) Mail.XML Guide

This guide provides information about using MailXML™ to receive mail tracking data through the IV-MTR application. Through Mail.XML, mailers can receive visibility information for letter and flat containers and handling units (trays, tubs, and sacks).

INFORMATIONAL - Western Region - Beaumont, TX – Tropical Storm Edouard Impacts

INFORMATIONAL - UPDATE - Elevate Your Marketing Strategy with USPS 2027 Mailing Promotions Kickoff Webinar

August 2026 Nixie Volume

This spreadsheet contains the UAA statistics for August 2026.

MPE (Mail Processing Equipment) Service Provider Licensees

Marketing contact information for certified Mail Processing Equipment (MPE) licensees 

PCC Insider August 2026 Edition