The Original Six
(Belgium, France, Germany, Italy, Luxembourg, Netherlands)

The First Enlargement
(Britain, Denmark, Ireland, 1973)
The Mediterranean Enlargement
(Greece, 1981; Portugal, Spain, 1986)
The EFTA Enlargement
(Austria, Finland, Sweden, 1995)
The Eastern Enlargement
(Czech Republic, Estonia, Hungary, Latvia, Lithuania, Poland, Slovakia, Slovenia, Cyprus, Malta, 2004)
2007 Entrant States
(Romania, Bulgaria, 2007)