| Country | ECIS? |
| Albania | |
| Andorra | |
| Austria | ECIS 2000 |
| Belarus | |
| Belgium | |
| Bosnia and Herzegovina | |
| Bulgaria | |
| Croatia | |
| Cyprus | |
| Czech Republic | |
| Denmark | ECIS 1999 |
| Estonia | |
| Finland | ECIS 2004 |
| France | ECIS 1998 |
| Germany | |
| Greece | ECIS 1995 |
| Hungary | |
| Iceland | |
| Ireland | ECIS 1997 |
| Italy | ECIS 2003 |
| Latvia | |
| Liechtenstein | |
| Lithuania | |
| Luxembourg | |
| Macedonia | |
| Malta | |
| Moldova | |
| Monaco | |
| Netherlands | ECIS 1994 |
| Norway | (Co-organisers for ECIS 2003) |
| Poland | ECIS 2002 |
| Portugal | ECIS 1996 |
| Romania | |
| Russia | |
| San Marino | |
| Serbia and Montenegro | |
| Slovakia (Slovak Republic) | |
| Slovenia | ECIS 2001 |
| Spain | Organisers of ICIS 2002 |
| Sweden | |
| Switzerland | |
| Ukraine | |
| United Kingdom | ECIS 1993 |
| Vatican City |