title: How to find zip codes within a range of miles?
body: <p>I have a db with clients zip codes, I want to create a page where the user input a zip code and select for example 50 miles and press search, then the page should show all other clients which have zip codes withing the range of this 50 miles.<br>
  Means near the given zip code within 50 miles radius.<br>
  Is there an API, Lib or something can give me this feature?  </p>