If I'm not wrong, SOME ZIP codes can be quite large (since a ZIP code (the 5 digit kind anyway) is actually equal to a postal station). Wouldn't that make the possible error factor pretty high?

If a Montana ZIP code is 50 miles by 50 miles and you're calculating the distance to an Alaska ZIP code which is also 50 miles by 50 miles -- how do you decide which distance to use? It COULD be from the farthest Northwest corner of Alaska to the farthest southwest corner of the Montana ZIP.

That could be a range of 200 miles, right?


>Does anyone have a code snippet for calculating the distance between 2 US zip codes in miles?
>
>David