I'm playing around with the free version of CartoDB right now. Trying to upload both a CSV and Excel document with a list of 5-digit zip codes. I have received a "there was a problem georeferencing your data" error. Any idea why this might be?
I just geocoded a couple zip codes without problem. Be sure that you:
- selected "You have a column identifying administrative regions" in the geocoding menu
- specified the correct column with the zip code in it (mine was a string data type column) where it says "In your table the polygons are identified by..."
- specify the United States in "I want my data in" and by "postal code"
If you're following these directions, I suggest trying a much smaller subset of your data, just a few zips and see if that works. There may be something weird in your data not visible to the naked eye (strange formatting always seems to get me).