Postal distance tools
List every ZIP code whose reference point lies within a chosen distance of a starting ZIP. Useful for service areas, delivery zones, store locators and local marketing lists.
The tool measures the straight-line distance from the starting ZIP's reference point to every other reference point in the dataset and lists the closest matches, up to 100, sorted by distance. Each row links to that ZIP's page.
Distances are calculated between approximate GeoNames postal reference points with the haversine formula. They are straight-line estimates, not driving routes, delivery zones or boundary intersections.
In dense cities a 5-mile radius can return dozens of ZIP codes; in rural areas a 25-mile radius may return only a handful. Start small and widen the search until the list matches the area you serve. Because ZIP codes are delivery routes, a reference point just outside your radius can still belong to a ZIP that overlaps your area.