“Find nearest location” by Zip/Postal Code?

Question

I need a \"find nearest location\" on our website.

Where visitor enters their zip/postal code, then they are redirected to specific webpage for our nearest location. We

Answer 1

if you have the longitudes and latitudes of each zipcode (search google) you can use the Haversine Formula to calculate nearest neighbours.

http://www.codecodex.com/wiki/Calculate_Distance_Between_Two_Points_on_a_Globe