| PES | EPP | ELDR | UPE | UEL |
| GREENS | ERA | NI | EN |
| Main | Party Politics | Primary | Statistics |
| Membership of the PES by National Parties | |
| Austria | |
| Belgium | Socialists: Flemish 3 |
| Denmark | Social Democrats |
| Finland | Social Dems 4 |
| France | Socialists 15 |
| Germany | Social Democrats 40 |
| Greece | Socialists 10 |
| Ireland | Labour 1 |
| Italy | Democratic left 16, Socialists 2 |
| Luxemburg | Socialists 2 |
| Netherlands | Labour 8 |
| Portugal | Socialists 10 |
| Spain | Socialists 22 |
| Sweden | Social Democrats 11 |
| United Kingdom | Labour 62, SDLP 1 |
| Membership of the EPP by National Parties | |
| Austria | |
| Belgium | Christian Dems: Flemish 4, Wallon 4 |
| Denmark | Conservatives 3 |
| Finland | Conservatives 4 |
| France | Christian Democrats 4 Republican 5 Social Democrats 1 |
| Germany | Christian Dems 39 CSU (Bavaria) 8 |
| Greece | New Democracy 9 |
| Ireland | Fine Gael 4 |
| Italy | Peoples Party 8 Segni 3 South Tirol PP 1 |
| Luxemburg | Christian Dems 2 |
| Netherlands | Christian Dems 10 |
| Portugal | Independent PSD 1 |
| Spain | Peoples Party 28 Catalan Dem U 1 Basque Nat P 1 |
| Sweden | Conservatives 5 Christian Dems 1 |
| United Kingdom | Conservatives 18 Official Unionist 1 |
| Membership of the ELDR by National Parties | |
| Austria | |
| Belgium | Liberals: Flemish 3, Wallon 5 |
| Denmark | Liberals 4, Radical |
| Finland | Centre P 5 |
| France | Radical 1 |
| Germany | |
| Greece | |
| Ireland | Independent 1 |
| Italy | Northern league 5, Republican 1 |
| Luxemburg | Democrat 1 |
| Netherlands | Liberal S 6, D66 4 |
| Portugal | Social Dem 8 |
| Spain | Catalan 2 |
| Sweden | Centre P 2, Liberals 1 |
| United Kingdom | Liberals 2 |
| Membership of the UPE by National Parties | |
| Austria | |
| Belgium | |
| Denmark | |
| Finland | |
| France | Gaullists (Conservatives) 4 |
| Germany | |
| Greece | Political Spring 2 |
| Ireland | Fianna Fail 7 |
| Italy | Forza Italia 27, Independents 2 |
| Luxemburg | |
| Netherlands | |
| Portugal | Christian Dems 3 |
| Spain | |
| Sweden | |
| United Kingdom | |
| Membership of the UEL by National Parties | |
| Austria | |
| Belgium | |
| Denmark | Socialists PP 1 |
| Finland | Left Alliance 1 |
| France | Communist Party 7 |
| Germany | |
| Greece | Communist P 2, Synaspismos 2 |
| Ireland | |
| Italy | Communist P 5 |
| Luxemburg | |
| Netherlands | |
| Portugal | Communist Party 3 |
| Spain | United Left 9 |
| Sweden | Left Party 1 |
| United Kingdom | |
| Membership of the Greens by National Parties | |
| Austria | Greens 1 |
| Belgium | Ecology: Flemish 1, Wallon 1 |
| Denmark | |
| Finland | Green League 1 |
| France | |
| Germany | Greens 12 |
| Greece | |
| Ireland | Greens 2 |
| Italy | Greens 3, Rete 1 |
| Luxemburg | Greens 1 |
| Netherlands | Greens 1 |
| Portugal | |
| Spain | |
| Sweden | Greens 1 |
| United Kingdom | |
| Membership of ERA by National Parties | |
| Austria | |
| Belgium | Voklsunie 1 |
| Denmark | |
| Finland | |
| France | Energie Radicale (Tapie list) 13 |
| Germany | |
| Greece | |
| Ireland | |
| Italy | Pannella list 2 |
| Luxemburg | |
| Netherlands | |
| Portugal | |
| Spain | National Coalition Canary Islands 1 |
| Sweden | |
| United Kingdom | Scottish Nationalist 1 |
| Membership of NI by National Parties | |
| Austria | Freedom P 5 |
| Belgium | Front National 2, Vlaams Blok 2 |
| Denmark | |
| Finland | |
| France | Front National 11 |
| Germany | |
| Greece | |
| Ireland | |
| Italy | National Alliance 111 |
| Luxemburg | |
| Netherlands | |
| Portugal | |
| Spain | |
| Sweden | |
| United Kingdom | National Unionist 1 |
| Membership of the EN by National Parties | |
| Austria | |
| Belgium | |
| Denmark | People's + June |
| Finland | |
| France | Autre Europe (Goldsmith List) 13 |
| Germany | |
| Greece | |
| Ireland | |
| Italy | |
| Luxemburg | |
| Netherlands | Calvinist P 2 |
| Portugal | |
| Spain | |
| Sweden | |
| United Kingdom | |
| Main | Party Politics | Primary | Statistics |