City State Product

The City State Product is a comprehensive list of city, county, and Post Office names associated with each ZIP Code™.

Who is City State Product for?

City State Product is for mailers who need assistance with the following processing functions: ZIP Code validation, ZIP Code Assignment, finance number assignment, county code/name identification, street name matching, ZIP Code and carrier route changes

First Class Mail

First Class Mail





Standard Mail

Standard Mail


What is City State Product?

City State Product is a comprehensive list of ZIP Codes with corresponding city and county names. This file also contains other names by which a Post Office™ may be known. City State Product can assist mailers with city, state, and 5-digit ZIP validation; ZIP Code and finance number assignment; and county code/name identification.

This product contains raw data and does not contain any software. It is available through Electronic Product Fulfillment (EPF) and contains approximately 100,000 records. The data is encrypted and cannot be exported. Using the AIS Viewer with the "address lookup" option meets the 5-digit ZIP Code accuracy standard for addresses used on pieces in non-automation pre-sorted rate First-Class Mail®, Periodicals, Standard Mail®, and Bound Printed Matter mailings. Updates are issued monthly and technical guides are available on-line by searching "Address Information System (AIS) Products Technical Guide" and downloading.

Note: City State Product does not contain detailed street data; it only contains city place names and their associated ZIP Codes. To perform complete 5-digit ZIP coding of address files, City State Product must be used in conjunction with Five-Digit ZIP® Product, ZIP + 4® Product, or Carrier Route Product.

Featured Resources

Fact Sheets
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.

Applications/ Forms
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.

Tech Guides
Address Information System (AIS) Products Technical Guide

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

Data Files
City State Sample File TXT

This document contains the sample text file for the AIS City State product.

Data Files
City State Sample File XLS

This document contains the sample file for AIS City State product.

Applications/ Forms
Electronic Product Fulfillment (EPF) Web Access Request Form

This form is used to create a Web-based account with the National Customer Support Center (NCSC) which will be utilized to retrieve/download files from the Electronic Product Fulfillment (EPF) website.

Applications/ Forms
Address Information System (AIS) Products Order Form

Order form for Address Information System (AIS) products.

Data Files
Applications/ Forms

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.

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.

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.

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.


For more information about Address Information Systems products, please contact the National Customer Support Center at 800-238-3150, or at