I'm looking for suggestions on how to go about finding postal codes close to a users postal code. 
 
Basically I need to find the closest location of a building to the postal code a user submits.  It needs to be more accurate than just looking for similar characters in the first 3 characters of the postal code.  This is only moderately accurate for metropolitan areas.  An example of where it doesn't work would be a rural code in Ont. starting with L0 where the closest location to this is somewhere in Toronto and the postal code starts with M.
 
Rick Mason
Pangaea NewMedia, Inc.
http://www.pangaeanewmedia.ca
416-922-1600

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