Hey HEALDEM,
The problem is not with the data. It's there in the maps. The problem is in Basecamp. The developers admit that there are still many problems and limitations in Basecamp's "Find" features. You could always install Mapsource to use for Postal Code searches until Basecamp is programmed to do it.
...ken...
there will be find improvements in BaseCamp 4.1.
Personally I end up using Google Maps for many places, get the coordinates and then enter them into BaseCamp for many POI's...
...basecamp crashes as i add each leg to my trip...