ZIP Codes cross county lines about 20% of the time. Many ZIP Codes span several counties and some even cross state lines. This Counties by ZIP Code product was created to identify ZIP Codes that span multiple counties (ZIP Code to County database), isolate one-to-one County to ZIP Code relationships, and/or identify all ZIP Codes within a given county’s boundary.
This is a one-to-many (ZIP Code to County) database. The file includes: all counties by ZIP Code, an estimate of the county percentage covered by each ZIP Code, a sequence showing the predominate counties for each ZIP Code, and much more (see features at right).
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