ZIP Code Distance Calculator
Straight-line distance between the centroids of two ZIP codes, with the compass bearing from the first to the second.
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Why this is not driving distance
Great-circle distance is the shortest path over the surface of the earth, which is rarely the path a road takes. Across a bay, a mountain range, or a river with few crossings, driving distance routinely runs 20 to 60 percent longer. For anything where travel time matters — service areas, delivery zones, territory planning — treat this as a lower bound and check the routes.
There is a second approximation underneath: each ZIP is reduced to a single centroid point. That is close enough in a dense city, where ZIPs are small, and quite loose in rural areas, where one ZIP can span hundreds of square miles.