| Country | Year | Question | Turnout % | Yes % |
| Denmark | 1972 | Entry to the EC | 90 | 63 |
|
| 1986 | Single European Act | 75 | 56 |
|
| 1992 | Maastricht | 83 | 49 |
|
| 1993 | Edinburgh | 87 | 57 |
|
| 1998 | Amsterdam | 76 | 55 |
|
| 2000 | Euro | 88 | 47 |
|
| 2014 | Unified Patent Court | 56 | 63 |
| Finland | 1994 | Entry to the EU | 74 | 57 |
| Norway | 1972 | Entry to the EC | 79 | 47 |
|
| 1994 | Entry to the EU | 89 | 48 |
| Sweden | 1994 | Entry to the EU | 83 | 52 |
|
| 2003 | Euro | 83 | 42 |