No. Although all 27 members of the European Union participate in the EU’s single market, only 21 countries use the euro as their official currency. These countries are collectively called the “eurozone.” Some EU members, such as Poland, Hungary, and the Czech Republic, continue to use their national currencies, while Denmark has a formal opt-out that allows it to retain the krone. Other countries, including Sweden, are legally committed to adopting the euro but have not set a timetable.
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