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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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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 or quarterly basis. The changed ZIP + 4® Code information is available 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.
No vendor information posted for this page yet.

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For more information about AIS Viewer and other addressing tools, contact the National Customer Support Center at 800-238-3150 Call: 800-238-3150, or at