Guide · 11 min read · Updated October 2026
How to Find ZIP Codes Within a Radius Free and Fast?
How do I find ZIP codes within a radius?
Enter a center ZIP code or city, set a radius in miles, and use a radius tool to list every ZIP code inside that circle. That takes a few seconds. Doing it by hand on a map takes an hour and still misses small ZIPs.
Local businesses need this list for Google Business Profile service areas, ad targeting, city pages and delivery zones. Agencies need it for every new client.
This guide shows how to find all ZIP codes within a radius, how the math works, how big a ZIP code is, and how to use the free ZIP code radius tool, which also covers postcodes in 44 more countries.
Key takeaways
- A radius search lists every ZIP whose center point is inside your circle.
- Distances are straight line miles, not driving miles.
- ZIP codes vary hugely in size, from a few blocks in a city to hundreds of square miles in rural areas.
- Google Business Profile allows up to 20 service areas, so pick the most useful cities.
- A ZIP code radius tool lists ZIPs and cities, suggests 20 service areas and exports two CSV files.
How Do I Find ZIP Codes Within a Radius? Fast Method
Use a radius tool: pick a center, set the miles, and copy the list. The tool measures the distance from your center to the center point of every ZIP and keeps the ones inside your circle.
The LocalSEOFlow ZIP code radius tool runs in your browser for US ZIPs. You can type a ZIP like 85201, a city like Mesa, AZ, or click the map, then slide the radius from 5 to 100 miles. Results show the ZIP count, city count and a circle on the map.
Find every ZIP in your radius
List ZIPs and cities in 5 to 100 miles, get 20 suggested service areas and export two CSV files. Free.
How to Find All ZIP Codes Within a Radius Without Missing Any
Because each ZIP is measured from its center point, a ZIP whose edge is inside your circle but whose center is outside will be left out. To catch those, raise the radius by a mile or two and review the extra ZIPs at the bottom of the list.
PO box and military ZIPs often have no fixed area and may not appear. That is normal. Use a nearby standard ZIP as your center if your own ZIP is one of these.
How Many Miles Is a ZIP Code?
There is no standard size. A ZIP code in a dense city can cover a few blocks. A rural ZIP can cover hundreds of square miles. ZIP codes follow mail delivery routes, not a grid, so their size depends on how many addresses the post office serves.
That is why a 10 mile radius in a city returns dozens of ZIPs, while the same radius in the countryside may return only a handful.
How Does a ZIP Radius Search Work?
It uses the haversine formula to measure straight line distance over the curve of the earth from your center to each ZIP's center point. It does not use roads, so driving distance is usually longer.
Can You Find Postcodes Within a Radius Outside the US?
Yes. Pick your country first. The tool supports 44 more countries, including the UK, Canada, Australia, India and Pakistan, where it finds postcodes and towns inside your radius from OpenStreetMap, in miles or kilometers. Coverage depends on how complete OpenStreetMap is for that country.
How to Use the ZIP List for Google Business Profile Service Areas
Google allows up to 20 service areas, and they must be named places like cities or ZIP codes, not a drawn radius. So turn your radius list into the 20 most useful places.
The tool suggests 20 cities, largest first by population, then closer ones. Most businesses use cities, because customers recognize them. Google also suggests keeping service areas within about two hours of driving from your base.
What to Do After You Have Your ZIP List
- Add up to 20 service areas to your Business Profile.
- Send the cities to the service area page planner to plan city pages.
- Use the ZIP CSV for ad targeting or delivery zones.
- Draw the same radius as a map file with the KML generator.
For the page side, read how to create city pages for service area businesses.
Frequently asked questions
How do I find all ZIP codes within a radius?
Enter a center ZIP or city in a radius tool, set the distance and copy the list. Raise the radius a little to catch ZIPs whose edges cross your circle.
How many miles is a ZIP code?
There is no fixed size. City ZIPs can cover a few blocks and rural ZIPs hundreds of square miles, because they follow mail routes.
Are radius distances driving miles?
No. They are straight line miles over the curve of the earth. Driving distances are usually longer.
Can I export ZIP codes to Excel?
Yes. The tool exports one CSV with every ZIP and one grouped by city. Both open in Excel and Google Sheets.
How many service areas can I add on Google?
Up to 20 per Business Profile. They can be cities, ZIP codes or other named regions.