PROCESSING AND DISTRIBUTION - Chicago, IL Regional (RPDC) - Power Outage

API Access Control Customer Dispute Instructions

INFORMATIONAL - UPDATE: PostalOne! Alert – October 4, 2026

INFORMATIONAL - Commercial System Releases – October 7, 8, and 11, 2026

Undeliverable-as-Addressed (UAA) Statistics by Mailing Industry Quarterly Report (Q4 FY26)

ACS Nixie stats by industry for FY26 Q4.

Mail Service Provider (MSP) - Full-Service Certified Mailers

A Mail Service Provider (MSP) offers a variety of solutions to prepare and present Full-Service presort mailings. For more information regarding Certified MSPs, please follow this link: https://postalpro.usps.com/full-service-cert/fact-sheet

September 2026 Nixie Volume

This spreadsheet contains the UAA statistics for September 2026.

October 11 2026 EPS 8.7.2.0 Release Notes

Coming Soon

October 8 2026 COP 2.5.9 Release Notes

Coming Soon

Beyond the Mail

A suite of additional new addressing & geospatial data products is available to customers with expanded use cases, now including USPS Emerging Roads and USPS ZIP Code Boundaries!  Coming Soon: USPS Geocoding API.

The United States Postal Service delivers to every address in the nation 6-7 days per week, collecting valuable addressing and geospatial data along the way as part of regular operations. With an unparalleled physical reach and frequency, USPS is delivering "Beyond the Mail" by offering a suite of addressing and geospatial data products geared towards customers with expanded use cases. The data collected by the USPS can benefit many industries, such as real estate, construction, insurance, navigation, logistics, mapping and marketing. 

Dear Customers,

The USPS is delivering Beyond the Mail!

A suite of additional new addressing and geospatial data products is coming available to customers with expanded use cases.

Visit Beyond the Mail | PostalPro (usps.gov) for the products currently available:

• USPS Post Office & Collection Box Location Data (https://postalpro.usps.com/gis)  
  • Datasets containing the specific coordinates of United States Postal Service Post Offices and blue collection boxes as well as detailed information around specific services offered and hours of operations or collection times.
• USPS Occupancy Trends (https://postalpro.usps.com/ot)
  • Populated using vacancy data collected by USPS® carrier operations, the USPS Occupancy Trends product provides an aggregate count of vacant addresses by ZIP Code™, USPS carrier route, county, and congressional district. Additionally, the count can be viewed by census tract, group and block as a fraction of total possible deliveries.
• USPS Population Mobility Trends (https://postalpro.usps.com/pmt)
  • A tabular dataset built upon aggregated USPS National Change of Address data and 2020 Census demographics (income, age, household size). The data is aggregated to highlight the 9 highest volume destination ZIP™ Codes (3 local, in-state, and out-of-state) people are migrating to for each source ZIP. Census demographic data is included for the top 3 volume breakdowns by demographic category (income, age, household size).
• NEW! USPS Emerging Roads: (https://postalpro.usps.com/er)
  • The Emerging Roads product provides new and existing roads with corresponding attributes based on new delivery points added to the system and USPS® GPS data from carrier activity.
• NEW! USPS ZIP Code Boundaries: (https://postalpro.usps.com/zcb) A national ZIP Code map utilizing USPS delivery address and location information to ensure extremely accurate boundaries. Temporal fluctuation is based on changing delivery distribution for new or changed delivery locations.

Additional product that is coming soon:

• USPS Geocoding API: COMING SOON
  • An API in which an input address is translated into geolocational front door and mailbox latitude and longitude coordinates with address matching notes.

We look forward to serving your business needs.

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

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.

ZIP Codes by Area and District codes

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

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.