Government and administration The departmental seat of government is known as the
prefecture () or and is generally a town of some importance roughly at the geographical centre of the department. This was determined according to the time taken to travel on horseback from the periphery of the department. The goal was for the prefecture to be accessible on horseback from any town in the department within 24 hours. The prefecture is not necessarily the largest city in the department: for instance, in
Saône-et-Loire department the capital is
Mâcon, but the largest city is
Chalon-sur-Saône. Departments may be divided into . The capital of an arrondissement is called a
subprefecture () or . Each department is administered by a
departmental council (), an assembly elected for six years by
universal suffrage, with the
President of the Departmental Council as executive of the department. Before 1982, the chief executive of the department was the
prefect (), who represents the
Government of France in each department and is appointed by the
President of the French Republic. The prefect is assisted by one or more sub-prefects () based in the subprefectures of the department. Since 1982, the prefect retains only the powers that are not delegated to the department councils. In practice, their role has been largely limited to preventing local policy from conflicting with national policy. The departments are further divided into
communes, governed by
municipal councils. As of 2025, there were 34,746 communes in France. In the
overseas territories, some communes play a role at departmental level.
Paris, the country's capital city, is a commune as well as a department. . The solid line is the Le Havre-Marseille line, to the east of which lives 60% of the French population. In mainland France (
metropolitan France, excluding
Corsica), the
median land area of a department is , which is two-and-a-half times the median land area of the
ceremonial counties of England and the
preserved counties of Wales and slightly more than three-and-half times the median land area of a
county of the United States. At the 2001 census, the median population of a department in continental France was 511,000 inhabitants, which is 21 times the median population of a United States county, but less than two-thirds of the median population of a ceremonial county of England and Wales. Most of the departments have an area of between 4,000 and 8,000 km2 (1500 to 3000 sq. mi), and a population between 320,000 and 1 million. The largest in area is
Gironde (), while the smallest is the city of Paris (). The most populous is
Nord (2,550,000) and the least populous is
Lozère (74,000).
Numbering The departments are numbered: their two-digit numbers appear in
postal codes, in
INSEE codes (including "social security numbers") and on
vehicle number plates. Initially the numbers corresponded to the alphabetical order of the names of the departments, but several changed their names and some have been divided, so the correspondence became less exact. Alphanumeric codes 2A and 2B were used for
Corsica while it was split but it has since reverted to 20. The two-digit code "98" is used by
Monaco. Together with the
ISO 3166-1 alpha-2 country code FR, the numbers form the
ISO 3166-2 country subdivision codes for the metropolitan departments. The overseas departments have three digits.
Relation to national government Originally, the relationship between the departments and the central government was left somewhat ambiguous. While citizens in each department elected their own officials, the local governments were subordinated to the central government, becoming instruments of national integration. By 1793, however, the revolutionary government had turned the departments into transmission belts for policies enacted in Paris. With few exceptions, the departments had this role until the early 1960s.
Political party preferences These maps cannot be used as a useful resource of voter preferences, because Departmental Councils are elected on a two-round system, which drastically limits the chances of fringe parties, if they are not supported on one of the two rounds by a moderate party. After the 1992 election, the left had a majority in only 21 of the 100 departments; after the 2011 election, the left dominated 61 of the 100 departments. (Mayotte only became a department after the election.) File:Cantonales_1998(dom).png|Party affiliation of the General Council Presidents of the various departments in the cantonal elections of 1998 File:Cantonales 2001.svg|Party affiliation of the General Council Presidents of the various departments in the elections of 2001 File:Cantonales 2004.svg|Party affiliation of the General Council Presidents of the various departments in the elections of 2004 File:Conseils généraux 2008.svg|Party affiliation of the General Council Presidents of the various departments in the elections of 2008 File:Conseils généraux 2011.png|Party affiliation of the General Council Presidents of the various departments in the elections of 2011 File:Presidents of French departments current.svg|Party affiliation of the General Council Presidents of the various departments in the elections of 2015 Key to the parties: •
Divers Centre = Independents of the centre or
Democratic Movement (Mouvement démocrate) • Divers Droite (DVD) = Independent conservatives • Divers Gauche (DVG) =
Independent left-wing politicians • MPF =
Movement for France (Mouvement pour la France) (right) • Nouveau Centre =
New Centre (centre or centre-right) • PCF =
French Communist Party (Parti communiste français) • PRG =
Radical Party of the Left (Parti radical de gauche) • PS =
Socialist Party (Parti socialiste) • UDF =
Union for French Democracy (Union pour la démocratie française) succeeded by Democratic Movement • UMP =
Union for a Popular Movement (Union pour un mouvement populaire) ==Future==