The US Government has a free web service that returns lon/lat for zip codes: http://www.census.gov/geo/www/tiger/tigermap.html -----Original Message----- On Behalf Of Casey Crookston Sent: Wednesday, March 28, 2007 10:58 AM I need to build a "find all locations with X miles of zip code xxxxx" feature. I understand that I need the ability to translate zip codes into longitude latitude and then back again.