Which currency is used by the largest number of countries?

1. Dollar
2. Pound
3. Euro
4. Yen

The euro is the official currency of 20 European Union member states (the eurozone) and several non-EU territories, making it the currency with the highest number of sovereign users globally. Adopted by over 340 million Europeans, the euro is the world’s second-largest reserve currency and second-most traded currency after the US dollar, facilitating economic integration across Europe.