Sweet! I found what looks like a good file - it will import anyway:
https://eric.clst.org/assets/wiki/uploads/Stuff/gz_2010_us_050_00_5m.json
Am I going to need to add a column to my data that maps to the COUNTY property? or is there some way I can map my 'state' and 'county' columns to the 'STATE' and 'NAME' properties in the map?
