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ZIPCodeLookup.io is an independent website. It is not operated, endorsed or sponsored by the United States Postal Service or any other postal operator. Official ZIP Code and ZIP+4 information for a specific address is available from the USPS ZIP Code Lookup.
Reference data, not address verification
- ZIP pages show postal reference records from GeoNames. They do not confirm that an address exists or can receive mail.
- A ZIP code missing from the dataset is not necessarily invalid, and a code present in it may have changed.
- County associations may not include every county a ZIP crosses.
- Coordinates are approximate reference points, not boundaries or centroids; distances are straight-line estimates, not routes.
- Location results from your device are estimates of nearby ZIP codes, not a confirmed mailing ZIP.
The full method is on About our ZIP code data.
No professional advice
Guides that touch on billing ZIP codes, insurance protection classes, housing allowances, parcel numbers, census data or mailing lists explain how those systems use ZIP codes and where to find official answers. They are not legal, financial, tax, insurance or military benefits advice. Confirm anything that affects money, coverage or legal rights with the relevant bank, insurer, agency or professional.
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Errors and corrections
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