ZipCodes aren't geographic areas, they are postal service delivery routes. Some of them have really wacky layouts and boundaries. In some places, a building has it's own zipcode. I also recommend you geocode each address, then do the distance math between lat-lons. Google it and you'll find several formulas. There are several address geocoders to use on the cheap, but you get what you pay for (daily limits, unresolved addresses, etc.) If you have some budget, check out www.proxix.com.
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