United States · Validation
ZIP Code validator.
Check the five-digit ZIP Code or nine-digit ZIP+4 shape in your browser, then use USPS for the live address lookup.
Check a ZIP Code
Result
Enter a ZIP Code and press Validate.
What this check means
USPS recognizes both five-digit ZIP Codes and the ZIP+4 form, written as five digits, a hyphen, and four more digits. A valid shape does not confirm that the code is assigned, that a street address is deliverable, or that a person or business is located there.
Official source and freshness
Checked 2026-09-29 against the USPS ZIP Code basics and USPS ZIP Code Lookup. USPS is the authority for a live address result and standardized mailing address.
Privacy
The format check runs entirely on this device. The ZIP Code is not sent to TNAADO, saved, or logged. Use the official USPS link when you need a live lookup.