# Distance Between ZIP Codes Calculator

> Distance between ZIP codes calculator: measure straight-line distance between any two US ZIP codes for shipping zones and territory planning. Free, runs locally.

- **Canonical URL:** https://boringtoolskit.com/distance-between-zips-calculator/
- **Category:** Converters
- **Evidence level:** authored-methodology
- **Reviewed:** July 26, 2026
- **Last verified:** 2026-10-12
- **Privacy:** Inputs and results stay in this browser unless the page clearly labels an external request.

## How it works

The calculator looks up the latitude and longitude centroid stored for each ZIP code, then applies the haversine formula to find the great-circle distance between the two points. It models the Earth as a sphere with a mean radius of 3,958.8 miles (6,371 km) and reports the result in miles and kilometers.

## Worked example

Enter 35004 (Acmar, AL, 33.5964, -86.5001) and 35055 (Cullman, AL, 34.1750, -86.8440). The latitude gap is 0.5786 degrees and the longitude gap is 0.3439 degrees, which gives a haversine value a of 0.0000317 and a central angle of 0.011261 radians, so distance = 3,958.8 x 0.011261 = 44.58 miles (71.74 km).

## Assumptions

- Results are great-circle, as-the-crow-flies distances between ZIP centroid points, not driving, walking, or shipping route distances.
- Each ZIP code is represented by a single centroid latitude and longitude, so results describe the ZIP area as a whole rather than any exact address.
- The Earth is treated as a perfect sphere with a mean radius of 3,958.8 miles (6,371 km), which can differ from true ellipsoidal distance by roughly 0.3 to 0.5 percent.

## Common questions

### Is the result a driving distance?

No. The calculator reports straight-line, as-the-crow-flies distance between the two ZIP centroids. Actual driving distance is almost always longer because roads curve around terrain and follow the highway network.

### Why does my result differ slightly from another website?

Different sites use different centroid sources and Earth models. Small variations of a mile or two are normal, especially for large or rural ZIP codes where centroid placement matters more.

### How accurate is the distance between two ZIP codes?

For most pairs the result is accurate within about one to three miles of the true centroid-to-centroid distance. The main source of error is that a ZIP centroid stands in for an entire delivery area, not a specific address.

## Related tools

- /time-zone-converter/

## Sources

- [Calculate distance, bearing and more between latitude/longitude points](https://www.movable-type.co.uk/scripts/latlong.html)
- [Gazetteer Files](https://www.census.gov/geographies/reference-files/time-series/geo/gazetteer-files.html)
- [ZIP Code Lookup](https://tools.usps.com/go/ZipLookup.htm)

---

*Local planning estimate. Verify current terms, rates, and policies before acting.*