Random Zip Code Generator
Generate zip and postal codes in the format you need for testing address forms and demos.
Random Zip Code Generator
US 5 digit zip
How many zip codes
How to use the zip code generator
- Choose whether to add the four digit ZIP plus four extension.
- Generate one or a batch of up to 500.
- Copy or export the codes for your test data.
What is a zip code generator
A zip code generator produces US zip codes for testing address forms and demos, as plain five digit codes or the nine digit ZIP plus four. Generate as many as you want and Random Nr returns well formed codes with a plausible leading digit, which saves inventing them by hand when you fill sample records or check how a form validates them.
What the first ZIP code digit means
A US zip code is not arbitrary: the first digit places it in one of ten broad regions that sweep across the country from the Northeast to the West Coast. The first three digits narrow it to a sectional centre, and the last two to a local post office.
| First digit | Region (roughly) |
|---|---|
| 0 | Northeast: New England, New Jersey, Puerto Rico |
| 1 | New York, Pennsylvania, Delaware |
| 3 | Southeast: Florida, Georgia, Alabama |
| 6 | Midwest: Illinois, Kansas, Missouri |
| 9 | West: California, Oregon, Washington, Alaska, Hawaii |
That structure is why a random five digit code still looks plausible: as long as it falls in the used range, the leading digit reads as a real region.
Five digits or ZIP plus four
The basic code is five digits. The nine digit ZIP plus four adds a dash and four more that pin down a city block, a large building or a single high volume mailbox. Most forms accept either, so the option here covers both. The tool draws codes from the plausible national range rather than a fixed area, which suits filling a form field without implying a specific place.
Why these ZIP codes are not real locations
Every code here falls in the range real zip codes use and carries a sensible leading digit, but it is random and not tied to a verified delivery point. That makes it safe test data for address forms and validation. For phone test data to go with an address, see the phone number generator.
More code and ID generators
Frequently asked questions
What format are these
United States zip codes, five digits, with an option for the nine digit ZIP+4 form.
Are they real postal codes
They fall in the plausible range and look valid, but they are random and not tied to a real location.
What is ZIP plus four
Four extra digits after the five digit code that narrow delivery to a smaller area. Tick the box to add them.
Can I make several
Yes, up to 500 at once, ready to copy or export.
Is it free
Yes, free and with no sign up.
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For phone test data see the phone number generator, or an address country field with other test tools.