The euro is the sole currency of 19 EU member states: Austria, Belgium, Cyprus, Estonia, Finland, France, Germany, Greece, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Portugal, Slovakia, Slovenia, and Spain.dditionally, 210 million people worldwide as of 2013 use currencies pegged to the euro. The euro is the second largest reserve currency as well as the second most traded currency in the world after the United States dollar.