There's a custom tag that does this for you: cf_ziprad, though it requires that you 
purchase a zip code db (well
worth the $$$)

--
Billy Cravens
HR Web Development, Sabre
[EMAIL PROTECTED]

Duane Boudreau wrote:

> Hi All,
>
> Does anyone have the mathematical function for calculating the distance
> between two zip codes using the latitude and longitude of both zip codes?
>
> TIA
> Duane
>
>
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