As of 2025[update], participants come from all 27 member states of the European Union as well as five of the nine candidate countries for membership, North Macedonia, Turkey, Serbia, Montenegro and Albania.

The General Assembly of the sessions is often held in real Parliamentary or governmental buildings of the hosting country, region or city or the European Union.

The following international sessions have been held or announced:[7] The Model European Parliament Baltic Sea Region (MEP BSR) is an international organization that includes eight member states of the EU situated in the Baltic Sea Region, but also welcomes delegates from Iceland, Norway and Russia (Kaliningrad).

[10] List of MEP CSEE sessions: A Western European version was launched in Autumn 2016 with the participation of Belgium, France, Germany, the United Kingdom, Luxembourg, Ireland and the Netherlands.

The aim of the MED MEP Region programme is to develop interest and skills in addressing high level international issues jointly among high-school students.