Look up a ZIP Code
Enter a 5-digit ZIP. We'll match it against our ZIP-prefix database and return the corresponding state abbreviation, full state name and a sample city in that area.
Browse ZIP prefixes by state
Pick a state to list the ZIP-prefix ranges we have on file.
Frequently Asked Questions
Is this an official USPS lookup?
No. We use a ZIP-prefix map distilled from public USPS information for quick reference. For any official or real-use case, confirm at tools.usps.com/zip-code-lookup.htm.
What does the ZIP-prefix rater match against?
The first three digits of the ZIP. The remaining four digits narrow the address but cannot be matched to a state in our simplified database.
Why does my ZIP return no state?
Some ZIP codes โ for example those used by the military (APO/FPO/DPO), territories, and new ZIP releases โ may not be in our sample database. Verify with USPS for the official record.
Can I use this in my application?
Yes. The lookup is fast and runs entirely in the browser for manual use. For high-volume programmatic access, see our API documentation.