Our file data and layouts

We've posted below the key layout information and fields contained within our zip code data downloads. This should help you set up your database or file system to import the zip code data fields as well as to decide which files you will need to download.

Zip Code to City File

This is the core product that relates city, county, and state information to 5 digit zipcode.

Field Name	Length	Description
5 digit zip	5	5 digit zip code
City Name	26	City Name associated for the zip code
USPS Preferred Name	1	Y/N field which indicates whether it is a USPS preferred city name
County FIPS	5	Code which defines they county - this can be linked to census data in many cases
County Name	26	Proper name of the county
State Code	2	2 digit abbreviation of the state