The election of representatives of groups of municipalities and mayors takes place by ballot paper sent by registered post to the prefecture of the Ile-de-France region, prefecture of Paris.
The ballot papers are counted by a commission comprising:
1° The prefect of the Ile-de-France region or his representative, chairman;
2° A chairman of a grouping of municipalities in the Ile-de-France region, appointed by the prefect of the Ile-de-France region;
3° A mayor of the Ile-de-France region, appointed by the prefect of the Ile-de-France region.
The secretariat is provided by an official from the prefecture.