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Find ZIP Codes in a Radius

Discover all US postal ZIP codes located within a specified radius (e.g. 5, 10, 25, or 50 miles) of any address or city. Displays distance, county, and enables instant CSV export for marketing and delivery zones.

By Marko Visic, Geospatial writer & editor·Updated October 30, 2026·Runs in your browser

Radius Search Results

Example· Not your location

Searching ZIP codes…

Loading ZIP centroids within 25 miles of Downtown Chicago

Sample Radius Queries:

Or click anywhere on the map to set the center.

Radius:

Loading ZIP data…

0 ZIP codes within 25 miles · 0 people

Centroid-based: a ZIP is listed when its Census internal point (centroid) is inside the circle, so a ZIP that only partly overlaps the edge may be left out, and one listed near the edge may extend past it. ZIPs here are Census ZIP Code Tabulation Areas (ZCTAs), which approximate USPS delivery ZIPs; PO-box-only and single-business ZIPs have no ZCTA and do not appear. "Nearest place" is the closest Census city, town or CDP to the ZIP centroid, not necessarily the USPS mailing city. Population is the ACS 2020-2024 5-year estimate.

ZIPs Found

Within 25 mi

Population

Sum of listed ZIPs

Circle Area

1,963 sq mi

πr²

States

—

Touched by results

How to use the ZIP code radius search

1Set the center and radius
Enter an address or ZIP code and choose 5, 10, 25, 50 miles or a custom radius.
2Find ZIP codes inside the circle
ZIP code center points are measured from your center and kept if they fall inside the radius.
3Review and export the list
Sort the ZIP codes by distance or population, then copy the list or download it as CSV or an Excel-ready file.

How to find ZIP codes within a radius

Type an address, city or landmark into the search box and press Search, or start from one of the sample radius queries.
Pick a radius in miles. The circle is drawn on the map around your center point.
Review the list of ZIP codes whose center point falls inside the circle, sorted by distance from the center.
Press Download ZIP List (CSV) to save the results for a spreadsheet, mailing tool or CRM.

Behind the scenes, each ZIP code is represented by the internal point of its Census ZIP Code Tabulation Area (ZCTA), taken from the Census Bureau's 2020 ZCTA Gazetteer. The United States has over 41,000 active 5-digit ZIP codes but only about 33,000 ZCTAs, because PO-box-only and single-building ZIP codes have no land area. The tool loads every ZCTA point in your browser, skips the ones that fall outside a quick bounding box around the circle, and measures the great-circle distance to the rest, keeping each one at or under your radius.

What is a ZIP code radius search? Center point vs. boundary

There are two distinct mathematical methods for determining whether a postal code belongs within a geographic circle:

Point Centroid Filtering (Standard Method): A ZIP code is included if and only if its official geographic center (centroid) falls within the radius. This is the industry standard for demographic sampling, targeted direct mail, and freight quoting.
Polygon Boundary Intersection: In this model, any ZIP code whose irregular territorial footprint even partially clips the circular buffer is included. This approach frequently overcounts by capturing ZIP codes whose population centers are miles outside the radius.

Open Map Lab uses the center-point method: a ZIP code is listed only when its center point is inside the circle. That keeps the list short and predictable, but a large ZIP code whose territory reaches into the circle can be left out if its center sits just outside.

Who uses a ZIP code radius search?

Extracting a clean, deduplicated list of ZIP codes within a specific radius has widespread commercial utility:

EDDM Mailings

Export clean CSV lists for USPS Every Door Direct Mail (EDDM) promotional campaigns targeting local postal customers.

Service Territories

Contractors, plumbers, and home care agencies establish contract delivery zones and determine service fee perimeters.

Healthcare Networks

Insurers and hospital networks establish physician network adequacy standards under federal distance guidelines.

How the radius distance check works

Demonstration of the computational pipeline for a 10-mile radius search centered on Downtown Chicago (41.8781° N, 87.6298° W):

GOVERNING MATHEMATICAL EQUATION\Delta \phi = \frac{r}{R}, \quad \Delta \lambda = \frac{r}{R \cdot \cos(\phi)}

VARIABLE DEFINITIONS & CONSTANTS

r:Search radius in miles (10.0 mi)

R:Earth mean radius (3,958.761 mi)

φ, λ:Center point coordinates (41.8781° N, -87.6298° W)

WORKED BENCHMARK: SPATIAL INDEX BOUNDING FILTER FOR CHICAGO

Radius r = 10.0 milesLatitude φ = 41.8781° (0.7309 rad)Longitude λ = -87.6298°

Latitude boundary delta: Δφ = 10 / 3,958.761 = 0.002526 rad = 0.1447°
Lat range: [41.7334° N, 42.0228° N]
Longitude boundary delta: Δλ = 10 / (3,958.761 × cos(41.8781°)) = 0.003392 rad = 0.1943°
Lon range: [-87.8241° W, -87.4355° W]
Any ZIP center point outside [41.7334 to 42.0228] latitude and [-87.8241 to -87.4355] longitude cannot be within 10 miles and can be skipped.
For the remaining points, the Haversine great-circle distance is computed and compared with 10 miles.

Computed Result:Only ZIP center points inside the box need the full distance check

The bounding box throws out almost all of the roughly 33,000 ZCTA points with two cheap comparisons, so the exact distance formula only runs on the few hundred that could be inside the circle.

How many ZIP codes are within 5, 10 or 25 miles?

Rough counts of distinct ZIP codes inside a radius in different settings:

Average ZIP Code Yield per Radius Filter

Cross-sectional estimates across major metropolitan, suburban, and rural regional archetypes.

Search Radius	Geographic Area	Dense Urban (e.g. NYC)	Suburban Belt	Rural Hinterland
5 Miles	78.5 sq mi	30 – 80 ZIPs	5 – 15 ZIPs	1 – 3 ZIPs
10 Miles	314.2 sq mi	120 – 250 ZIPs	25 – 60 ZIPs	3 – 8 ZIPs
25 Miles	1,963.5 sq mi	350 – 600+ ZIPs	100 – 220 ZIPs	12 – 30 ZIPs
50 Miles	7,854.0 sq mi	650 – 1,100+ ZIPs	250 – 500 ZIPs	40 – 90 ZIPs

Accuracy and limitations of ZIP radius results

Before relying on radius ZIP code data for formal business filings, note these technical boundaries:

Important Considerations

ZCTAs, not every ZIP code: Results come from the 2020 Census ZCTAs. PO-box-only, military and single-building ZIP codes have no ZCTA and are not listed, and ZIP codes created or changed by USPS since 2020 may be missing.
Center points, not boundaries: Inclusion is decided by each ZIP code's center point, so a ZIP code that only partly overlaps the circle may be left out (or included even though most of its area is outside).
Unique & Military ZIPs: Certain specialty ZIP codes (such as military APO/FPO or high-volume corporate PO Boxes) do not map to standard land areas.
Water Bodies: Radius rings over ocean bays, lakes, or protected national preserves will naturally return fewer postal codes than land-locked circles.
Sales Tax Warning: ZIP code boundaries frequently cross state and municipal borders. Do not use ZIP radius lists as definitive sales tax rate boundaries.

Explore Related Tools

Looking for cities rather than ZIPs? Try Find Cities in a Radius or calculate straight-line distances with Distance Between ZIP Codes.

Quick facts about the ZIP code radius search

Fact	Value	Notes
Radius Presets	5, 10, 15, 25, 50 Miles	Custom slider adjustment up to 100 miles
Data Source	US Census Bureau ZCTA Database	Accurate centroid coordinates
Export Ready	One-Click CSV Download	Contains ZIP, distance, and coordinates

PRECISION & EXCEPTIONS

Edge cases and exceptions

Boundary vs. Centroid Overlap

A ZIP code whose geographic territory extends inside the radius circle may be omitted if its centroid lies slightly outside the buffer boundary.

FIELD APPLICATIONS

The ZIP code radius search: worked examples

Local Delivery Service Area

Scenario: A restaurant in Austin, Texas looking for all ZIP codes within a 10-mile delivery radius.

Outcome: Finds 18 matching ZIP codes, sorting from 78701 (0.0 mi) outward to 78745 (7.8 mi), with instant CSV export.

FREQUENTLY ASKED QUESTIONS

Frequently asked questions about the ZIP code radius search

How does the radius ZIP code search work?

It calculates great-circle geodesic distances between your target center point and all US Census ZCTA centroids, filtering those within your radius threshold.

Can I export the resulting ZIP code list?

Yes. Click the "Export CSV" button to download a spreadsheet with all matching ZIP codes, names, and distances.

How are ZIP codes selected for a radius?

A ZIP code is included when its representative point falls within the circle. Large rural ZIP areas can extend beyond the circle but may still be listed if their centroid is inside.

Can I use the list for direct mail?

It is a good planning list. Confirm eligible delivery routes and counts with the USPS or your mailing vendor before printing.

What radius sizes are supported?

Common sizes such as 5, 10, 25 and 50 miles, or any custom value.

Does the list include PO Box only ZIP codes?

It focuses on ZIP codes with a geographic area. Unique and PO Box-only codes may not appear.

Can I export the list?

Yes. Download the ZIP codes, their distances and counties as a CSV file.

How do I search by ZIP code instead of address?

Type the ZIP code in the search field and the tool centers the radius on that ZIP code's centroid.

How do I find the ZIP codes inside a city?

Search the city center and use a small radius, then compare with the ZIP map. City and ZIP boundaries are different, so results will include nearby codes.

How current is the ZIP database?

ZIP centroids come from the Census ZCTA data, so recent USPS changes may not be reflected.

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