Counties by ZIP+4 Database

Multiple Counties ZIP+4

This product provides a way to accurately identify the county for any 9-digit ZIP Code. This is particularly beneficial in determining the county for a given address containing ZIP+4 while keeping the database to a manageable size. We were able to significantly reduce the number of records normally required for this type of operation by listing each ZIP+4 range and the corresponding county instead of each individual code.

Unlike standard 5-digit ZIP Codes, 9-digit ZIP Codes typically do not span multiple counties. The file includes all counties for each 9-digit ZIP Code and much more (see features at right).
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Multiple Counties by ZIP Code

This product is used for quickly obtaining determining a county based on 9-digit ZIP Codes (ZIP+4) with the efficiency of a smaller dataset.
  • Tax calculations
  • Insurance rate calculations
  • HMO coverage area determination
  • Sales territory assignments
  • Fraud detection
  • Data Verification
Learn more: view the Product Documentation / Watch our Accuracy Matters video

Database Sources

We are licensees of USPS database products, but we enhance our databases based on decades of experience to provide you with the most accurate product available.

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  • Low Cost
  • One Year Access
  • Updated Quarterly
  • Unlimited Downloads
  • Unlimited User Licensing Available
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Cannot be resold, transferred, or used to compete with (as outlined in our license agreement).

Related Links

Counties by ZIP Code (5 digit)