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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Keep your systems current by regularly downloading database updates during your subscription period.

Quarterly Updates

Based on frequency of change, we recommend you download the latest version of this particular database on a regular basis.

Download Options

Immediate download link from our site, a free utility for custom files, or an FTP directory (upon request) auto updated as new releases occur.

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 Specs

Data Format - CSV

Comma-Separated Values (CSV) Text File

5 Digit ZIP Code

Official U.S. Postal Service nine digit ZIP Code

4 Digit Range Start

This is the 4 digit starting range for the Zip+4 code

4 Digit Range Finish

This is the 4 digit ending range for the Zip+4 code

County Name

The name of the county in which the ZIP Code is found. Note: that it is our own standardized spelling of the county. For matching other sources, use the FIPS codes when possible. (example: where we have ''O’Brien'' others may have ''Obrien'')

County FIPS

Federal Information Processing Standard (FIPS) 3‐digit county. FIPS codes are not available for all areas (APO, FPO, some U.S. Territories).

State Abbrev

Official U.S. state name

State Name

Official U.S. Postal Service state abbreviation

State FIPS

Federal Information Processing Standard (FIPS) 2‐digit state. FIPS codes are not available for all areas (APO, FPO, some U.S. Territories).

City or Town

The name of the city or town - up to 30 characters

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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  • One Year Access
  • Updated Quarterly
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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)