ZIP code generator
Random US ZIP codes taken from Census ZIP Code Tabulation Areas, with an optional synthetic +4 suffix for test data.
Output · 0 ZIPs
Loading…Adjust options to generate ZIP codes.
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.
- Format
- 5 · ZIP+4
- Batch
- 1–20
Related tools
This ZIP code generator gives you US ZIP codes that actually exist, so your test data doesn't fail a lookup. It draws them from the Census Bureau's 2025 list of ZIP Code Tabulation Areas, which has over 30,000 entries, and shows each one's coordinates and land area under Census ZCTA details. Turn on ZIP+4 and a random four-digit suffix gets added. That suffix is made up, because the Census data only covers five-digit codes.
How to generate sample ZIP codes
- Set How many from 1 to 20.
- Flip the ZIP+4 switch if you want the 12345-6789 form.
- Press Generate or Regenerate for a new batch.
- Click a code to copy it, or use Copy all to get the batch one per line.
Where the codes come from
Normally each code is a real ZCTA picked at random from the Census Gazetteer file. ZCTAs are the Census Bureau's versions of USPS ZIP areas, and most match a USPS ZIP exactly. Expand Census ZCTA details to see each code's center point, with a link to OpenStreetMap, and its land area in square miles. If the dataset can't be reached, the tool falls back to random five-digit numbers between 00501 and 99950 and the output badge says fallback. Those may not be assigned ZIPs.
When sample ZIP codes are useful
- Filling ZIP fields in automated form tests.
- Seeding shipping or checkout demos with codes that pass a basic lookup.
- Populating a ZIP column in a development database.
- Testing how your code parses and formats ZIP+4.
Frequently asked questions
Are the generated ZIP codes real?
The five-digit part is a real Census ZCTA in normal mode, so it matches an actual area. The +4 suffix is random and probably doesn't match a real delivery point. In fallback mode, the five-digit codes are format-only too.
What is ZIP+4 format?
A five-digit ZIP, then a hyphen and four more digits, like 90210-1234. USPS uses the extra digits to narrow mail down to a block, a building or a group of PO boxes.
Can I use these ZIPs for real shipping or address validation?
No. A ZIP alone isn't an address, and the +4 part here is made up. When delivery matters, use USPS address verification or a commercial address API.
How many ZIP codes can I generate at once?
Up to 20 per batch. Regenerate as often as you like.
Built and maintained by Bipul Kumar. Found a wrong number or a broken result? Tell me and I'll fix it.