Im looking for the functionality seen in most commercial websites like google maps to get approximate distance between cities and zip codes. Im guessing these sites are using huge databases with all this information already in them. It would be interesting to learn how to create this functionality myself but Im sure that would require a great deal of time. So Im looking for a package where someone has already done the work(an API) that would allow me to enter two different zip codes or maybe two different city,state combinations and take actions from there.
Thanks for your help.
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