Hauts-de-Seine
A French department forming part of the western inner suburbs of Paris and home to the La Défense business district.
Last updated August 21, 2026
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Overview
Hauts-de-Seine is a department of France in the Île-de-France region, occupying the western inner suburbs of Paris. It is part of the Petite Couronne, the inner ring formed by Hauts-de-Seine, Seine-Saint-Denis and Val-de-Marne around the capital, and has been included within the wider institutional area of Greater Paris since 2016. The department borders Paris to the east, Seine-Saint-Denis and Val-de-Marne to the southeast, Val-d’Oise to the north, Yvelines to the west and Essonne to the south. Its prefecture is Nanterre, while Antony and Boulogne-Billancourt serve as subprefecture locations; Boulogne-Billancourt is the department’s largest municipality by population. The department was created in 1968 as part of the territorial reorganization implemented under legislation adopted in 1964. Its territory was assembled from portions of the former departments of Seine and Seine-et-Oise. Nanterre had been selected as the seat of the new department before its formal establishment. The area had previously been administered within the former Seine department from 1790 onward, linking the modern institution to the long administrative history of the Paris region. With an area of approximately 176 square kilometres, Hauts-de-Seine is the smallest department in metropolitan France apart from Paris. It is nevertheless one of the country’s most populous and densely settled departments. The department had about 1.65 million residents in 2023 and ranked seventh nationally by population. Its residents are known in French as Altoséquanais and Altoséquanaises. The built environment is predominantly urban, but the department also contains significant riverfront areas, parks and the Bois de Boulogne, which lies within the municipal territory of Paris near its eastern boundary. Hauts-de-Seine is especially associated with La Défense, the major office, retail, transport and cultural district extending across parts of Courbevoie, Puteaux and Nanterre. La Défense is one of Europe’s principal business centres and a major concentration of corporate headquarters, financial services, public transport infrastructure and modern architecture. The department also includes important residential, commercial and institutional centres such as Boulogne-Billancourt, Neuilly-sur-Seine, Levallois-Perret, Issy-les-Moulineaux and Rueil-Malmaison. Its economy benefits from proximity to Paris, high-value services, technology, media, retail, research and corporate activity. Hauts-de-Seine is among France’s wealthiest territorial departments. Official statistical material cited for 2020 places its gross domestic product per capita at roughly €107,800, among the highest levels recorded for a French department. This prosperity coexists with substantial social and spatial differences between municipalities and neighbourhoods, making housing, transport, education and social services important areas of departmental policy. The department is governed by the Departmental Council, whose 46 councillors are elected by canton for six-year terms. The council manages departmental responsibilities including social welfare, support for older and disabled people, child protection, some education infrastructure, roads, cultural activity and environmental programs. Georges Siffredi has served as president of the Departmental Council since 2020. Electoral politics have generally favoured centre-right parties, and the department has not had a left-wing majority since its creation. A proposed institutional merger with neighbouring Yvelines was endorsed by both departmental councils in 2016, but the merger project was abandoned in 2021; interdepartmental cooperation continues.
History
The territory now known as Hauts-de-Seine was administered within the former department of Seine from the creation of France’s modern departmental system in 1790 until 1968. The post-war growth of Paris and the increasing urbanization of its western suburbs made the existing departmental boundaries increasingly difficult to manage. A territorial reform law adopted in 1964 provided for the creation of new departments around Paris. Hauts-de-Seine was formally established in 1968 from sections of Seine and Seine-et-Oise, becoming one of the three departments of the Petite Couronne together with Seine-Saint-Denis and Val-de-Marne. Nanterre was selected as its prefecture in advance of the department’s creation. The new department brought together a diverse group of municipalities. Its eastern and southeastern areas are closely integrated with Paris, while its western municipalities extend toward the larger suburban belt of Île-de-France. The department’s development was shaped by rapid post-war housing construction, expanding road and rail links, and the growth of office and service-sector employment. La Défense emerged as the most prominent expression of this transformation. Planned as a major business district west of central Paris, it developed into a large concentration of offices, shopping facilities, public art, transport links and corporate headquarters across several municipalities. Hauts-de-Seine became a significant centre of national politics as well as business. Its municipalities include Neuilly-sur-Seine, historically associated with affluent suburban politics, and Nanterre, a major university and administrative centre. Nicolas Sarkozy, who later served as president of France, was mayor of Neuilly-sur-Seine and later president of the departmental council from 2004 to 2007. The department’s politics have generally favoured the centre right, and no left-wing majority has controlled the departmental council since its establishment. The department received national attention during controversies in the 1990s and early 2000s involving alleged misuse of public funds allocated to housing projects. The affair involved Charles Pasqua and other figures connected with the Rally for the Republic. It contributed to broader scrutiny of the relationship between local government, political networks and public procurement in the Paris region. In 2016, the departmental councils of Hauts-de-Seine and Yvelines voted to pursue a merger. A joint public institution was established to coordinate projects and services, but the full merger was ultimately abandoned in 2021. Cooperation between the departments continues. Since 2016, Hauts-de-Seine has also formed part of the institutional landscape of Greater Paris. Today it remains a densely populated metropolitan department with 36 communes, a strong service economy, major transport and business infrastructure, and extensive responsibilities in social policy, education-related facilities, roads, culture and environmental management.
- 2021
Merger project abandoned
[1]The proposed merger with Yvelines was abandoned, while joint cooperation remained in place.
- 2020
Georges Siffredi elected council president
[1]Georges Siffredi became president of the Departmental Council.
- 2016
Greater Paris integration and Yvelines cooperation
[1]Hauts-de-Seine became part of Greater Paris’s institutional area and its council supported a proposed merger with Yvelines.
- 1968
Hauts-de-Seine created
[1]The department was established from parts of the former Seine and Seine-et-Oise departments.
- 1965
Nanterre selected as prefecture
[1]Nanterre was designated as the administrative seat of the future department.
- 1964
Paris-region departmental reform adopted
[1]Legislation provided the framework for reorganizing the departments surrounding Paris.
- 1790
Departmental system established
[1]The territory that would later form Hauts-de-Seine was placed within the new French departmental system and subsequently administered as part of the department of Seine.
Products and positioning
A high-density, high-income metropolitan department positioned at the western gateway to Paris, combining public administration, affluent residential municipalities and one of Europe’s leading business districts.
Controversies
1990
Public-housing funds controversy
A corruption controversy concerning the alleged misuse of public money assigned to departmental housing projects received national attention in the 1990s and early 2000s. Charles Pasqua and other political figures associated with the RPR were among those implicated in the affair.
Brand decisions
2016
Pursuit of merger with YvelinesStrategyBackground
The two neighbouring western departments sought closer administrative coordination and considered replacing their separate structures with a combined department.
Action taken
The Hauts-de-Seine Departmental Council voted in favour of the merger and participated in the creation of a joint interdepartmental public institution.
Aftermath
The merger was abandoned in 2021, but cooperation between the two departments continued.
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