US ZIP Code Validator
Validate US ZIP code format.
Validate US ZIP codes instantly. Free ZIP + ZIP+4 validator.
Calculator Inputs
About ZIP Code
Validate US ZIP code format.
Checks 5-digit or ZIP+4 format.
Where it is used
Address validation, shipping forms.
How to use the ZIP Code
- US ZIP Code — enter the value (e.g. 10001 or 10001-1234).
- Calculate — press the Calculate button to see the result instantly above.
Formula
5 digits or 5-4 digit pattern.
Examples
Example
zip:10001
Result: ZIP 10001 — VALID ✓ (5-digit)
Frequently Asked Questions
- ZIP+4?
- Extended format: 12345-6789 for precise delivery points.