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

Area/District 3-digit and 5-digit ZIP Code Assignments (AREA_DIST_ZIP.TXT)

CASS™ Certified Products Guide: Z4CHANGE Cycle O - (Expires July 31, 2028)

Z4 Info File

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

CASS™ Certified Products Guide: Z4CHANGE Data File Cycle O - (Expires July 31, 2028)

Z4CHANGE Order Form

This order form is used to subscribe to the Z4CHANGE product. 

Address Information System (AIS) Products Pricing

Pricing guide for Address Information System (AIS) products, including Carrier Route, ZIP + 4®, Five-Digit ZIP®, City State, Delivery Statistics, Z4Change, ZIPMove, eLOT®, and RDI™.

Address Information System (AIS) Viewer Order Form (PS Form 5111)

Product order form for Adress Information System (AIS) Viewer. Products available for purchase are the City/State Delivery Type Retrieval, County Name Retrieval, Delivery Statistics Retrieval, and ZIP + 4 Retrieval.

AIS Copyright/License Agreement

Address Information System (AIS) Products Pricing

Pricing guide for Address Information System (AIS) products, including Carrier Route, ZIP + 4®, Five-Digit ZIP®, City State, Delivery Statistics, Z4Change, ZIPMove, eLOT®, and RDI™.

AIS Copyright/License Agreement

Electronic Product Fulfillment (EPF) Web Access Request Form

This form is used to create a Web-based account with the Addressing and Geospatial Technology (AGT) office which will be utilized to retrieve/download files from the Electronic Product Fulfillment (EPF) website.

Electronic Product Fulfillment (EPF) Web Access Request Form

This form is used to create a Web-based account with the Addressing and Geospatial Technology (AGT) office which will be utilized to retrieve/download files from the Electronic Product Fulfillment (EPF) website.

Address Information System (AIS) Products Technical Guide

The Address Information System (AIS) Products Technical Guide contains documentation on all AIS products, including RDI™, Z4Change, ZIPMove, ZIP + 4®, Five-Digit ZIP®, eLOT®, Carrier Route, City State, and Delivery Statistics.

Address Information System (AIS) Products Technical Guide

The Address Information System (AIS) Products Technical Guide contains documentation on all AIS products, including RDI™, Z4Change, ZIPMove, ZIP + 4®, Five-Digit ZIP®, eLOT®, Carrier Route, City State, and Delivery Statistics.

Address Information System (AIS) Viewer User Guide

User guide for Address Information System (AIS) Viewer, an application that provides the ability to retrieve, view, and print reports on demand at a 5-digit ZIP code level.

AIS Products Price Change letter - 2019

Domestic Mail Manual (DMM®) 509: Address Information System Products

Address Management provides services that enable customers to manage thequality of their mailing lists while maximizing the Postal Service's ability to efficiently deliver mail.

Domestic Mail Manual (DMM®) 509.1.30: Z4CHANGE

This document provides information on the Z4CHANGE service.

Sample Z4CHANGE File TXT

This document provides a sample of a Z4CHANGE .txt file.

Sample Z4CHANGE File TXT

This document provides a sample of a Z4CHANGE .txt file.