ZIP + 4® Product
The ZIP + 4® Product is a base reference file that can be accessed by an application to assign the correct ZIP + 4® Code associated with a physical address.
Who is ZIP + 4® Product for?
ZIP + 4® is for mailers looking to add ZIP + 4® codes to their address files. Mailers must purchase or develop their own matching software in order to use this file.
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Correct and Standardize: Address Information System (AIS) Products
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Description
What is ZIP + 4® Product?
The ZIP + 4® Product File enables businesses with computer capabilities to add ZIP + 4® codes to their address files. The ZIP + 4® file contains approximately 30 million records is available in its entirety or by selected states. The ZIP + 4® product contains raw data and does not contain any software. ZIP + 4® file is available through Electronic Product Fulfillment (EPF) on a monthly basis. The ZIP + 4® Transaction file is included in the ZIP + 4® Product and is updated monthly.
To convert mailing lists to ZIP + 4®, mailers can:
- Order an electronic ZIP + 4® database from the United States Postal Service® and develop their own address-matching software.
- Lease or purchase software from an outside vendor and convert their own lists.
- Subcontract their conversion through a service bureau.
Featured Resources
01/28/2020
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.
Sample ZIP + 4® File TXT
This document provides a sample of a ZIP + 4 .txt file.
Sample ZIP + 4® Transaction File TXT
This document provides a sample of a ZIP + 4 Transaction .txt file.
05/16/2022
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.
07/14/2024
Address Information Systems (AIS) Products Order Form
Order form for Address Information System (AIS) products.
07/14/2024
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.
07/14/2024
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™.
12/01/2022
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.
07/14/2024
Related Products
Address Information System (AIS) Viewer
AIS Viewer is an interactive application designed to provide the ability to retrieve, view, and print accurate and current ZIP Code™ information for all 50 states.
Carrier Route Product
The Carrier Route Product provides reference information needed to apply carrier route codes to addresses for presort postage discounts.
City State Product
The City State Product is a comprehensive list of city, county, and Post Office names associated with each ZIP Code™.
Delivery Statistics Product
The Delivery Statistics Product defines the number of post office boxes and business/residential deliveries on city, rural, and highway contract routes for every ZIP Code™ in the United States.
Enhanced Line of Travel (eLOT®)
The eLOT product allows mailers the ability to sort their mailings in approximate carrier-casing sequence.
Five-Digit ZIP® Product
The Five-Digit ZIP® Product provides five-digit ZIP Code™ data that can be appended to computerized mailing lists via address-matching software.
Z4CHANGE Product
Z4CHANGE Product provides mailers the information necessary to create an application that would facilitate frequent and cost-effective processing for updating very large computerized mailing lists for automation compatibility and improved deliverability.
ZIPMove Product
ZIPMove Product offers a means of correcting addresses that have undergone a ZIP Code™ realignment in which a change in city name and finance number occurred.
Contact
For more information about AIS Viewer and other addressing tools, contact the Addressing and Geospatial Technology office at 800-238-3150 
, or at incsc@usps.gov.