I see 2 potential problems with the zip codes.

First, unless a search returns all results within "x" miles it's not going to be very user friendly. For example, look at the number of zip codes in Los Angeles.

Second, I don't know how many general searchers use a zip code as a means of finding something local. I would tend to believe they'd be more likely to use city or state.

If your search by zip is going to return all the results within "x" miles, great. Personally, as a navigatable and crawlable site map, I'd prefer using a state/city URL rewrite wige suggested rather than the zip code. Makes the site user friendly and search friendly.

Dave

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