how to setup "closest location near you"

Dear all,

I was asked to update a site for a hair salon chain and in the 
process of discussing on how to make the "our locations" page better 
my client got the idea add the feature "closest location near you" 
which would use a postal zip code.

Has anybody done something like that? What is involved? Open source cgi?

The chain only covers Connecticut and Massachusetts.

Any hints and tips are very much welcome.

Greetings,

:: doris

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