What is Euro Zone ?

The eurozone, officially called the euro area is a monetary union of 19 of the 28 European union (EU)
 member states which have adopted the euro (€) as their common currency and sole legal tender. The other nine members of the European Union continue to use their own national currencies.

Member states

State	Adopted	Population (thousand, 2012)	Nominal GNI nominal (million USD, 2012)	Relative GNI of total (nominal)	GNI per capita nominal (USD, 2012)	Pre-Euro currency	Exceptions	ISO code
Austria	1999-01-01[15]	8,430	404,279	3.18%	47,031	Schilling		AT
Belgium	1999-01-01[15]	11,128	498,767	3.93%	44,820	Franc		BE
Cyprus	2008-01-01[16]	1,129	22,799	0.18%	26,110	Pound	Northern Cyprus[a]	CY
Estonia	2011-01-01[17]	1,329	21,684	0.17%	16,310	Kroon		EE
Finland	1999-01-01[15]	5,414	252,262	1.99%	40,838	Markka		FI
France	1999-01-01[15]	65,697	2,749,098	21.64%	41,850	Franc	New Caledonia[b]  French Polynesia[b]  Wallis and Futuna[b]	FR
Germany	1999-01-01[15]	80,426	3,632,832	28.60%	45,170	Mark		DE
Greece	2001-01-01[18]	11,093	263,029	2.07%	23,710	Drachma		GR
Ireland	1999-01-01[15]	4,587	179,390	1.41%	48,787	Pound		IE
Italy	1999-01-01[15]	59,540	2,067,214	16.27%	34,720	Lira	Campione d'Italia[c]	IT
Latvia	2014-01-01[19]	2,034	28,598	0.23%	14,060	Lats		LV
Lithuania	2015-01-01[20]	2,944	44,060	0.35%	14,900	Litas		LT
Luxembourg	1999-01-01[15]	531	38,125	0.30%	93,174	Franc		LU
Malta	2008-01-01[21]	419	8,274	0.07%	19,730	Lira		MT
Netherlands	1999-01-01[15]	16,755	806,108	6.35%	48,110	Guilder	Aruba[d]  Curaçao[e]  Sint Maarten[e]  Caribbean Netherlands[f]	NL
Portugal	1999-01-01[15]	10,515	217,521	1.71%	20,690	Escudo		PT
Slovakia	2009-01-01[22]	5,408	93,032	0.73%	17,200	Koruna		SK
Slovenia	2007-01-01[23]	2,057	46,965	0.37%	22,830	Tolar		SI
Spain	1999-01-01[15]	46,761	1,371,856	10.80%	33,711	Peseta		ES
Eurozone		333,253	12,701,834	100%	38,115