I've written a nice php/mysql site that let's you search for hospitals and
community colleges by zip code. The search is built upon some math that
figures out distances by a zip's lat and lon cords.

My problem is that my current ZIP table (bout 42,000 rows) seems to be
flawed. There are a ton of zip codes round california that have all the same
lat and lons. There are other dups as well. So I'm looking for some new

Does anyone know a good source for this type of info?

~ Mike

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