Free tool
ZIP Code Lookup
Type any U.S. ZIP code and see the city, county, and FIPS codes it belongs to — instantly, free.
Accepts a ZIP code, a city and state, or a full mailing address.
Official Census source
Built from U.S. Census Bureau & federal releases.
FIPS join keys
City, County & ZIP lists line up on FIPS.
A–F completeness grade
Every row graded so you know what's filled.
Commercial license
Use it in your product. No attribution required.
About this tool
Is the free lookup really free?
Yes — single lookups are free, no account required. The paid list is for when you need every city at once.
Where does the data come from?
The U.S. Census Bureau and other federal sources, cleaned and joined on FIPS codes.
Can I use the results commercially?
The full list ships with a commercial license and needs no attribution.