European Free Trade Association (4, non-eu north/central/west europe)
Central European Free Trade Agreement (7, non-eu balkan)
Monetary Agreement with the EU (4 tiny countries)
United Kingdom (in case this is read post-brexit)
Which I shall call "Main Europe". It has 43 countries. Note that this does not include countries like Russia, Belarus, or Ukraine.
As well as the following countries from outside of Main Europe:
all of these countries are, in some way, comparable in terms of: