Richard, thanks again for the quick reply. I really appreciate it. I should have mentioned that I will not need to view any of the data simultaneously, so overlapping polygons shouldn't be a problem. Given your resentment towards the Make Query Table tool, it seems the best option is the second one you mention: to join the 'US_CountyLines' feature class to the 'MortalityData' table and export the resultant attribute table to Excel. (I'll then have to do some clean-up as multiple states have the same county names.) My next question is, if I then import the newly-created table into ArcMap, how would I display its data? 'Display XY data' creates a point feature class... I'm unsure how to proceed from here.
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