使用欧元的欧盟国家-19：A total of 19 of the 27 members of the European Union have adopted
the euro as their official and sole currency, creating the 'eurozone' or
'euro area'. These countries are:

• Austria, Belgium, Cyprus,
  Estonia, Finland, France, Germany, Greece, Ireland, Italy, Latvia,
  Lithuania, Luxembourg, Malta, the Netherlands, Portugal, Slovakia,
  Slovenia and Spain.

非欧盟国家却使用欧元-6：In addition to these members of the eurozone, the following non-EU
members have also adopted the euro as their official currency:

• Andorra, Kosovo, Monaco, Montenegro, San Marino and Vatican City

计划未来使用欧元的国家-3：

Bulgaria, Croatia and Romania

无立刻计划使用欧元的欧盟国家-5：

Czech Republic, Denmark，Hungary, Poland，Sweden