Does anyone know of a free web service that can return all zip codes or addresses within a certain range of another zip code. I'm building a real estate application where users type in a zip code and the app will return all the houses that are within say a 5 miles radius. Then I need to take these zip codes and use them in the query to extract all listings that have those zip codes.
For example, if someone types in zip 21237, the service will return 21237, 21236, 21242, 21257. The last three are the next closest zip codes. Then I take these zips and use them in my query.
Or
if someone were to type in Baltimore, MD, the service will return Baltimore, Towson, Essex, Rosedale, then I'll return all results based on those cities.
I tried to do this manually, but it was impossible to do. I would have to literally go through all the zips in the US, and do some crazy mathematics.
I'd really appreciate ...
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