[Answer] How many European Union countries use the euro as their official currency?

Step 1 : Introduction to the question "How many European Union countries use the euro as their official currency?"

...1. 10 2. 19 3. 24 4. 28

Step 2 : Answer to the question "How many European Union countries use the euro as their official currency?"

19 - Even though there are 28 countries in the European Union, you might be surprised to know that only 19 of them use the euro. Bulgaria, Croatia, Czech Republic, Denmark, Hungary, Poland, Romania, Sweden, and the United Kingdom have retained their own national currencies instead of using the euro. However, the euro is not just limited to the European Union. Countries outside the EU—including Andorra, Monaco, San Marino, and Vatican City—use the euro as their official currency, while Kosovo and Montenegro unofficially use it as their de-facto currency. Unsurprisingly, due to the high usage rate of the euro, the currency is ranked the second-largest reserve currency in the world only behind the United States Dollar.:

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