Random Zip Code Generator
Generate valid-format US ZIP codes, optionally filtered by state or extended to ZIP+4, for testing forms and sample data - the same generator behind our fake address generator, on its own.
Recommended Settings
Pro Tips
- •Each ZIP code is drawn from the official postal code range for a real US state, so the format and geography are always consistent
- •These are valid-format codes for testing, not necessarily active, deliverable ZIP codes
- •Turn on ZIP+4 format to also generate the four-digit add-on code some shipping and mailing systems require
- •Filter to a single state when you need test data confined to one region
Most Popular
Most people generate a batch of 10-25 plain 5-digit ZIP codes for form or database testing
When to Use This Tool
Fill ZIP code fields with valid-format values while testing signup, checkout, or admin forms.
Generate a batch of ZIP codes to populate a spreadsheet, mock dataset, or demo.
Test shipping-rate calculators or address validation logic against a range of ZIP codes.
Use alongside our Random Address Generator when you need full street-level placeholder data instead of just a ZIP.
How It Works
Pick a US state, or leave it on 'Any State' for a random mix across the country
Choose how many ZIP codes to generate, and whether to include the ZIP+4 extension
Each code is generated within that state's official postal code range
Copy the full list or download it as a .txt file
100% Private
Files never leave your device. All processing happens locally in your browser.
Lightning Fast
Powered by Client-side JavaScript using the Web Crypto API for randomness for optimal performance on modern browsers.
Open Source
Built with verified, open-source libraries. Fully transparent.
Frequently Asked Questions
Are these real, deliverable ZIP codes?
They're valid-format codes drawn from the real postal code range for the state you select, but they aren't checked against USPS's live database, so a specific code may or may not be an actively used ZIP code.
What is ZIP+4?
ZIP+4 is an extended format that adds a four-digit code after the standard 5-digit ZIP code to pinpoint a smaller delivery area - some shipping and mailing systems require it.
Can I generate ZIP codes for a specific state?
Yes - select a state from the dropdown to generate codes only within that state's postal code range, or leave it on 'Any State' for a nationwide mix.
How is this different from the Random Address Generator?
This tool generates ZIP codes on their own. The Random Address Generator pairs a ZIP code with a real city and state name plus a randomly generated street address for full placeholder addresses.
Is my data sent to a server?
No. Every ZIP code is generated locally in your browser using JavaScript - nothing is transmitted anywhere.