Which countries use the euro but not in the EU?

Related questions

1. Why is Montenegro called Montenegro?
2. Is EU democratic?
3. Does Hungary use the euro?
4. Is Monaco in EU?
5. Is Montenegro in Schengen zone?
6. Is the EU an institution?
7. Who are the 28 members of the EU?
8. Does EU have laws?
9. Does EU law override national law?
10. Does Denmark use the euro?

Tags

1. #united
2. #eurozone
3. #hungary
4. #kingdom
5. #czech
6. #bulgaria
7. #croatia
8. #european
9. #countries
10. #state
11. #romania
12. #mechanism
13. #members
14. #sweden
15. #spend
16. #republic
17. #before
18. #years
19. #joining
20. #exchange
21. #denmark
22. #poland