title: Import large CSV file into TileMill for use in MapBox
body: <p>I am beginning to experiment with using MapBox and TileMill, and what I would like to do is map 400,000 addresses in a CSV file which have been pre-geocoded.  When I try to add this 100mb CSV file as a layer into MapBox, I receive an error telling me that the CSV file is greater than 20mb and apparently this is a problem.</p>
  
  <p><img src="https://i.stack.imgur.com/uArT6.png" alt="TileMill 20mb file size limit"></p>
  
  <p>Can someone point me in the right direction in terms of what is the best way to get these 400k records into TileMill?  Eventually, I want to publish the map to the web, and I was planning to do that using MapBox.  I saw a program for converting CSV to a shapefile, and wondering whether this is the best approach.</p>