Many ZIP Codes span several counties and some even cross into other states. ZIP Codes span more than one county around 20% of the time. This ZIP Code County Database identifies and lists ZIP Codes that span multiple counties along with an approximation of the ZIP Code's coverage area within the county. It can be used to isolate one-to-one County to ZIP Code relationships and to identify all ZIP Codes within a given county’s boundary.
It is a one-to-many (ZIP Code-to-County) database and includes:
Related to this product is our: Counties by 9-digit ZIP Code (ZIP+4)
Comma-Separated Values (CSV) Text File
Official U.S. Postal Service five digit ZIP Code
The name of the county in which the ZIP Code is found. This is a one-to-many (ZIP Code to County) relationship.
Federal Information Processing Standard (FIPS) 3‐digit county. FIPS codes are not available for all areas (APO, FPO, some U.S. Territories).
This is the percentage of the zip code area which this county occupies. If there is only one county for the zip code it will be '100'. This is a rounded number, so there could be cases where not all totals equal 100%.
This is for prioritizing the counties within a ZIP Code (sequence 1 is the main county for the ZIP Code).
Official U.S. Postal Service state abbreviation
Federal Information Processing Standard (FIPS) 2‐digit state. FIPS codes are not available for all areas (APO, FPO, some U.S. Territories).
Official city name used by the U.S. Postal Service
