Randomly
ZIP code generator
Generate format-valid sample US ZIP codes, optionally with the +4 add-on. For fixtures and demos — random within the real ZIP range.
Output · 0 ZIPs
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The assigned-ZCTA dataset is unavailable, so these are format-valid sample ZIP codes for fixtures and demos and may not correspond to a real assigned ZIP.
A free ZIP code generator that produces format-valid sample US ZIP codes — 5-digit or the extended ZIP+4 format — for use in test data, form fixtures, and demos. Generated codes follow the real US ZIP range (00001–99950) but are not verified against any postal database and are not tied to specific real locations.
How to generate sample ZIP codes
- Choose the format: standard 5-digit ZIP or the extended ZIP+4.
- Set how many codes to generate (up to 20).
- Click Generate to produce the batch.
- Tap any code to copy it to your clipboard.
ZIP vs ZIP+4 — what is the difference?
A standard ZIP code is a 5-digit number used to identify a postal delivery area in the United States. ZIP+4 appends a hyphen and four more digits that narrow the delivery point to a specific block or building. The +4 extension is used in bulk mailing and address verification but is optional in most forms.
When fake ZIP codes are useful
- Filling ZIP fields in automated form-validation tests.
- Creating fixture data for e-commerce, shipping, and address-form demos.
- Populating ZIP code columns in development database seed scripts.
- Testing ZIP+4 parsing and formatting in address-processing code.
Frequently asked questions
Are the generated ZIP codes real locations?
They are format-valid (within the real US ZIP range) but are not verified against USPS data. They may or may not correspond to an actual delivery zone.
What is ZIP+4 format?
ZIP+4 is the standard 5-digit ZIP followed by a hyphen and four additional digits — for example 90210-1234. The extra digits pinpoint a delivery point more precisely.
Can I use these ZIPs for shipping or address validation?
No. They are for test data only. Use a verified address database or USPS API when real deliverability matters.
How many ZIP codes can I generate at once?
Up to 20 per batch. Click Generate again for more.