World Government – European Union
| Nation | Joined |
| Austria | 1995-01-01 |
| Belgium | 1957-03-25 |
| Bulgaria | 2007-01-01 |
| Croatia | 2013-07-01 |
| Cyprus | 2004-05-01 |
| Czech Republic | 2004-05-01 |
| Denmark | 1973-01-01 |
| Estonia | 2004-05-01 |
| Finland | 1995-01-01 |
| France | 1957-03-25 |
| Germany | 1957-03-25 |
| Greece | 1981-01-01 |
| Hungary | 2004-05-01 |
| Ireland | 1973-01-01 |
| Italy | 1957-03-25 |
| Latvia | 2004-05-01 |
| Lithuania | 2004-05-01 |
| Luxembourg | 1957-03-25 |
| Malta | 2004-05-01 |
| Netherlands | 1957-03-25 |
| Poland | 2004-05-01 |
| Portugal | 1986-01-01 |
| Romania | 2007-01-01 |
| Slovakia | 2004-05-01 |
| Slovenia | 2004-05-01 |
| Spain | 1986-01-01 |
| Sweden | 1995-01-01 |
| United Kingdom | 1973-01-01 |
