Counties by ZIP+4 Database

rural urban 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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Database Specs & Features

Download Sample Data (CSV)

  • Immediate Download

    Download is available immediately upon purchase and for the duration of the annual subscription.

  • Quarterly Updates

    A monthly update of this database is not necessary, so we update our database quarterly and recommend that you download quarterly as well.

  • Free FTP/SFTP (upon request)

    To update your database without human intervention, we can provide an FTP address for you to write a script to access. Just request it after purchase.

  • 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

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