title: Retrieve Census tract from Coordinates
body: <p>I have a dataset with longitude and latitude coordinates. I want to retrieve the corresponding census tract. Is there a dataset or api that would allow me to do this? </p>
  
  <p>My dataset looks like this: </p>
  
  <pre><code>       lat       lon   
  1 40.61847 -74.02123   
  2 40.71348 -73.96551   
  3 40.69948 -73.96104    
  4 40.70377 -73.93116   
  5 40.67859 -73.99049   
  6 40.71234 -73.92416   
  </code></pre>
  
  <p>I want to add a column with the corresponding census tract. </p>
  
  <p>Final output should look something like this (these are not the right numbers, just an example).</p>
  
  <pre><code>       lat       lon     Census_Tract_Label   
  1 40.61847 -74.02123                   5.01
  2 40.71348 -73.96551                     20
  3 40.69948 -73.96104                     41
  4 40.70377 -73.93116                  52.02
  5 40.67859 -73.99049                     58
  6 40.71234 -73.92416                     60
  </code></pre>