Bitcoin purchases by country I'm interested in getting data on bitcoin adoption by country. Is there a way of mapping bitcoin addresses to countries of origination?
Nate is right.  But there is this tool: 

http://fiatleak.com/ 

which can help you see a particular currency's exchanges in and out of Bitcoin.  

Euro, USD and Yuan are usually the most predominant.

It could be somewhat helpful, it is open and javascript based so you can see how it works.  

That could possibly give you additional ideas on solving your problem.