An Important Note Regarding Counties
Within Our ZIP Code Databases
Our databases contain only a single
county for each ZIP Code. Our databases do not list every
county/ZIP Code combination that exists in the US.
The county data in our databases contain only the county NAME. FIP numbers are not included. We will can provide FIPs upon special request, for an extra fee.
In the real world, ZIP Code boundaries
will sometimes cross county boundaries. This means that a particular ZIP
Code may lie in more than one county. About a quarter of all ZIP Codes
cross into a second county. If you need to know every county that
exists within a particular ZIP Code, then do NOT use our databases. You
will need to find another vendor to provide you with such a database.
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