Article L3122-3 of the French General Code of Local Authorities
The duties of president of a departmental council are incompatible with the exercise of one of the following elective offices: president of a regional council, mayor. The functions of president of a departmental council are also incompatible with those of member of the European Commission, member of the Executive Board of the European Central Bank or member of the Monetary Policy Council of the Banque de France. [Provisions declared not…