Random ZIP Code Generator

About the Random ZIP Code Generator

What is a random ZIP code generator?

A random ZIP code generator picks US ZIP codes at random for test data, forms and examples.

ZIP codes are the five-digit postal codes the US Postal Service launched in 1963. This generator draws from 40,977 real ZIP codes in the GeoNames postal code list, each with its city, state and county, so it never makes up a number.

That matters because most five-digit numbers are not ZIP codes. Only about 41% of the 100,000 numbers from 00000 to 99999 are in the list, so a random ZIP code built from five random digits is more often fake than real.

What do the five digits of a ZIP code mean?

A ZIP code's first digit names a broad area, from 0 in the East to 9 in the West.

The next two digits narrow it to a regional area, and the last two point to a specific post office, according to the US Postal Service. The table shows which states each first digit covers in the GeoNames list.

A few ZIP codes cross these lines. El Paso, Texas uses codes that start with 885, Washington, DC has six codes that start with 569, and New York's Holtsville and Fishers Island codes start with 0.

How do you generate a random ZIP code?

Choose a state and how many ZIP codes you need, then press Generate ZIP codes.

1. Pick a state. Leave Any state selected for ZIP codes from all 50 states and DC.
2. Set how many. Ask for 1 to 5,000, and with No repeats on, a state with fewer ZIP codes gives you every one it has.
3. Pick a format. Choose City, ST ZIP lines, ZIP codes only, CSV or JSON.
4. Generate, then copy or download. The card at the top shows the first ZIP code with its own Copy button.

Example

These settings will be converted to three random California ZIP codes in CSV.

State: California
How many: 3
Format: CSV

zip,city,state,county
93722,Fresno,CA,Fresno
95714,Dutch Flat,CA,Placer
91210,Glendale,CA,Los Angeles

Each run picks its own ZIP codes, but every row is a real California ZIP code with its county.

The ZIP code checker works the other way around. Type 12345 into it and it answers with the place:

12345

12345 is a real ZIP code.
Schenectady, New York.
County: Schenectady.

Which ZIP codes are real?

A ZIP code is real only if the US Postal Service has assigned it.

The table checks a few well-known numbers against the GeoNames list. The Postal Service names 00501, a ZIP code of its own for the IRS in Holtsville, New York, as the lowest, and 99950 in Ketchikan, Alaska as the highest.

What is the difference between a ZIP code, ZIP+4 and a postal code?

A ZIP code is the US version of a postal code, and ZIP+4 adds four digits to it.

The Postal Service added ZIP+4 in 1983 to sort mail to a group of streets or a single large building. Other countries use their own formats, so a US ZIP code will not fit a Canadian or British address form.

The Random ZIP Code Generator only makes US ZIP codes, so it cannot give you a random postal code for Canada or the UK. With ZIP+4 turned on, the last four digits are random, so they will not match the real ZIP+4 of any address.

How many ZIP codes does each state have?

Texas has the most ZIP codes in the GeoNames list, 2,600, and Rhode Island the fewest, 90.

California is a close second with 2,593. The table counts every state and Washington, DC, 40,977 ZIP codes in all, which is also how many the State menu can draw from.

Common mistakes

These mistakes with random ZIP codes are easy to make and easy to avoid.

• Opening the CSV in a spreadsheet. Excel reads 01001 as the number 1001 and drops the leading zero. Import the zip column as text, or use the JSON output.
• Treating the +4 as real. With ZIP+4 on, the last four digits are random and will not match a real delivery point. Leave ZIP+4 off when every digit has to be real.
• Mixing states. Each ZIP code in the list belongs to one state, so 90210 with Texas fails a form that checks the two together. The generator keeps the city, state and county of each ZIP code together.

Common Use Cases

People use random ZIP codes wherever they need a real US location without a real person behind it.

• Testing address forms. Check that a form accepts leading zeros, ZIP+4 and ZIP codes from every state.
• Sample datasets. Fill a database, a spreadsheet or a demo with CSV or JSON rows that carry a real city, state and county.
• Placeholders in designs. Put a real city and ZIP code in a mockup instead of a fake ZIP code.
• Teaching and examples. Show how ZIP codes map to states and counties with codes that exist.

For fake US phone numbers to go with them, use the Random Phone Number Generator. To turn the CSV output into JSON or back, use CSV to JSON and JSON to CSV, and to read a large CSV file in a table, use the CSV Viewer.

Frequently Asked Questions

Are the ZIP codes from this generator real?

Yes, every ZIP code comes from the GeoNames list of 40,977 real US ZIP codes. GeoNames is not an official Postal Service source and ZIP codes can change, so use them as test data rather than for real mail.

Is 12345 a real ZIP code?

Yes, 12345 is a real ZIP code for Schenectady, New York. Type any five digits into our ZIP code checker to test another number the same way.

Is there a 00001 ZIP code?

No, the lowest ZIP code is 00501. The US Postal Service lists 00501 as a ZIP code of its own for the IRS in Holtsville, New York.

Can you use a random ZIP code as a billing ZIP code?

No, not for a real card payment. Payment forms that verify the card compare the ZIP code with the billing address your bank has on file, so a random one can get the payment declined.

Can you get random ZIP codes for one state?

Yes, choose the state in the generator and every ZIP code comes from that state. Delaware has 96 ZIP codes in the list, so asking for more with No repeats on gives you all 96.

The ZIP code data comes from the GeoNames postal code file for the United States (CC BY 4.0), dated 2026-09-23. The Random ZIP Code Generator leaves out military (APO, FPO, DPO) and territory ZIP codes.