USPS Ship Webinar Census and Monthly Assessments

ZIP Codes by Area and District codes

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

Informed Visibility® Mail Tracking & Reporting (IV®-MTR) Release Notes

These release notes summarize new features and enhancements implemented in deployments to the IV-MTR application.

January 2026 Nixie Volume

This spreadsheet contains the UAA statistics for January 2026.

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

NCOALink® Full Service Provider Licensees

This document contains information about NCOA^Link® Full Service Provider Licensees. These service providers receive 48 months of change-of-address (COA) data from the USPS^® on a weekly basis.

NCOALink® Certified Software Developers

This document contains contact information for NCOA^Link® Certified Software Developers.

NCOALink® Licensed Interface Distributors

This document contains contact information for NCOA^Link® Licensed Interface Distributors.

NCOALink® Limited Service Provider Licensees

This document provides a list of service providers and contact information for NCOA^Link®. These providers receive 18 months of change-of-address (COA) data on a weekly basis from the USPS^®. For the full 48 months of COA data refer to the NCOA^Link Full Service Provider Licensees.

DSF2® Licensees

This document contains a list of DSF^2® licensed providers with contact information.