I would like to play with data for counties and I want to create map boundaries as well. What ID attribute does CODAP need to use to look up function for US County Boundaries?
CODAP allows for any of four keys to be used as you can see in the accompanying screenshot.
Note that the simple county name is allowed, but, for common county names, will be insufficient. It was included for those situations in which a small number of counties are displayed, all with unambiguous names.