Sweden is the most northern country in the European Union, but arguably the answer could be Denmark if you include Greenland, a Danish territory.
A member of the EU is a member nation of the European Union.
All of the UK is a member of the EU
No, New Zealand is not a member of the EU.
Laos is not a member of the EU.
It became an EU member on 1st January, 2007.
Australia has never been a member of the EU and never will be.
Andorra is not a member of the EU.
They are a member of the EU and the Schengen Treaty.
Yes, Romania is a member of the EU.
Croatia will become a member of the EU on July 1, 2013.
No, Uzbekistan is not a member of the EU, nor is it under consideration for EU membership at any future time.