| Name: | European Union |
| Former names: | European Economic Community (1958-1983) European Community (1983-1993) |
| Foundation date: | 1 January 1958 |
| Headquarters: | Brussels (Belgium) |
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Flag of the European Economic Community 1958-1983 |
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Flag of the European Community / European Union since 1983 |
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Anthem of the European Union |
| 1 January 1958 | Belgium, France, Germany, Italy, Luxemburg, Netherlands |
| 1 January 1973 | Denmark, Ireland, United Kingdom |
| 1 January 1981 | Greece |
| 1 January 1986 | Portugal, Spain |
| 1 January 1995 | Austria, Finland, Sweden |
| 1 May 2004 | Cyprus, Czechia, Estonia, Hungary, Latvia, Lithuania, Malta, Poland, Slovakia, Slovenia |
