Base Tables: PARS 2025

This spreadsheet contains 44 base tables focusing on postal operations, cost, and volume of handling UAA mail from FY2025.

Class Tables: PARS 2025

This spreadsheet contains 64 class tables that provide cost and volume by class of mail, presort category, and shape from FY2025.

Volume Tables: PARS 2025

This spreadsheet contains 3 volume tables that provide summary data by class of mail, shape, presort category, and disposition of UAA Mail.

USPS Mail Flow 101 Webinar

USPS Ship Webinar USPS Ship Overview, Migration and Enrollment Slides

USPS Ship Webinar: USPS Ship Overview, Migration, and Enrollment Slides

USPS Ship Frequently Asked Questions

USPS Ship Frequently Asked Questions

Guide to USPS Ship

USPS Ship Tech Sheet

USPS Ship is a modernized platform enabling commercial package payment, verification, and end-to-end visibility for a wide array of domestic and international products.

Speakers Bureau List 6.0 - 12.18.25

INFORMATIONAL: Update - January Price Change 2026 - Commercial System Releases

COMPLETED - January Price Change 2026 - Commercial System Releases

January 4 2026 Release Notes

INFORMATIONAL – Officer Announcement – Jason DeChambeau as Acting Vice President of Processing Operations

Undeliverable-as-Addressed (UAA) Statistics by Mailing Industry Quarterly Report (Q1 FY26)

ACS Nixie stats by industry for FY26 Q1.

December 2025 Nixie Volume

This spreadsheet contains the UAA statistics for December 2025.

Labeling Lists Technical Guide

The Labeling Lists data product assists mailers with presorting mail. It provides active, originating 3- and 5-digit ZIP Code™ data along with their destination locations [including city/state/ZIP Code] for labeling purposes. The product contains complete data files of each list found online via Postal Explorer® at https://pe.usps.com. Updates to the Labeling Lists are also published in the Postal Bulletin.

INFORMATIONAL - Tracking API Provisioning Notification

Catalog Insights Promotion FAQ

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

INFORMATIONAL - Mail Spoken Here - December Edition

Announcing the Winners of the #ThankfulPCC PCC Voice Challenge!

PCC Insider December 2025 Edition

DELIVERY - WestPac Area: California 6 District - Wrightwood Post Office and Lytle Post - Resume Operations

USPS APIs Terms and Conditions

ACKNOWLEDGEMENT AND ACCEPTANCE. Read this carefully before registering to use the USPS API services. By utilizing the APIs, you hereby ACCEPT ALL of the terms and conditions of this Agreement. 

INFORMATIONAL: USPS APIs System Deployment - January 10, 2026

Labeling List Changes Effective February 1, 2026

Effective February 1, 2026, the Postal Service™ will revise Labeling List(s) L002, L005, L012, L016, L051, L201, and L606 to reflect changes in mail processing operations. Mailers are expected to label according to these revised lists for mailings inducted on or after the February 1, 2026, effective date through March 31, 2026, expiration date. The changes will be published in the Postal Bulletin, Issue #22694.

DELIVERY - Wrightwood Post Office (92397) - Temporarily Closed

DELIVERY - Lytle Creek Post Office (92358) - Temporarily Closed

INFORMATIONAL - USPS APIs System Maintenance January 14, 2026

PTR2 Release Notes_DD_01_10_26

INFORMATIONAL - Postal Service Files Requests for New Rules on Market Dominant Rates

INFORMATIONAL - MGI Important Dates

INFORMATIONAL - January Price Change 2026 - Commercial System Releases January 4