title: Nearest zip code of a zip code?
body: <p>I need to find the 5 nearest zip code of a zip code.
  For example, I have 33304, and I need to find the nearest ones, like 33309, 33308 ...</p>
  
  <p>Is there a database or a web service somewhere that would help me with that?</p>
  
  <p>I think I'm gonna have to build my own database in order to do that? I know how to do it, but in case it has already been done ...</p>