Hauts-de-Seine (French pronunciation: [o d(ə) sɛn] ; lit. 'Seine Heights') is a department in the Île-de-France region of France. It covers Paris's western inner suburbs. It is bordered by Paris, Seine-Saint-Denis and Val-de-Marne to the east, Val-d'Oise to the north, Yvelines to the west and Essonne to the south. With a population of 1,624,357 (as of 2019) and a total area of 176 square kilometres (68 square miles), it has the second highest population density among all departments of France, after Paris. It is the fifth most populous department in France. Its prefecture is Nanterre, but Boulogne-Billancourt, one of its two subprefectures, alongside Antony, has a larger population.

Hauts-de-Seine is best known for containing the modern office, cinema and shopping complex La Défense, one of Grand Paris's main economic centres and one of Europe's major business districts. Hauts-de-Seine is one of the wealthiest departments in France; it had the highest GDP per capita in France at €107,800 in 2020. Its inhabitants are called Altoséquanais (masculine) and Altoséquanaises (feminine) in French.

From 1790 to 1968, Hauts-de-Seine was part of the former department of Seine.

The Hauts-de-Seine department was created in 1968, from parts of the former departments of Seine and Seine-et-Oise. Its creation reflected the implementation of a law passed in 1964; Nanterre had already been selected as the prefecture for the new department early in 1965.

In 2016, the Departmental Council of Hauts-de-Seine voted in favour of a fusion of Hauts-de-Seine and Yvelines, its western neighbour. Following a similar vote in Yvelines, an établissement public interdépartemental was established. The fusion project was abandoned in 2021, but the cooperation between the two departments continues.

Historical population

Year Pop. ±% p.a. 1881 254,928 —     1891 332,076 +2.68% 1901 467,391 +3.48% 1911 614,862 +2.78% 1921 724,261 +1.65% 1931 949,231 +2.74% 1936 1,019,627 +1.44% 1946 992,859 −0.27% 1954 1,118,020 +1.50%	Year Pop. ±% p.a. 1962 1,381,805 +2.68% 1968 1,461,619 +0.94% 1975 1,438,930 −0.22% 1982 1,387,039 −0.52% 1990 1,391,658 +0.04% 1999 1,428,881 +0.29% 2006 1,536,100 +1.04% 2011 1,581,268 +0.58% 2016 1,603,268 +0.28%
Graphs are unavailable due to technical issues. There is more info on Phabricator and on MediaWiki.org.
Sources:

Place of birth of residents of Hauts-de-Seine in 1999

Born in metropolitan France	Born outside metropolitan France
80.6%	19.4%
	Born in overseas France	Born in foreign countries with French citizenship at birth	EU-15 immigrants	Non-EU-15 immigrants
	1.5%	3.5%	3.8%	10.6%
This group is made up largely of former French settlers, such as pieds-noirs in Northwest Africa, followed by former colonial citizens who had French citizenship at birth (such as was often the case for the native elite in French colonies), as well as to a lesser extent foreign-born children of French expatriates. A foreign country is understood as a country not part of France in 1999, so a person born for example in 1950 in Algeria, when Algeria was an integral part of France, is nonetheless listed as a person born in a foreign country in French statistics. An immigrant is a person born in a foreign country not having French citizenship at birth. An immigrant may have acquired French citizenship since moving to France, but is still considered an immigrant in French statistics. On the other hand, persons born in France with foreign citizenship (the children of immigrants) are not listed as immigrants.

Hauts-de-Seine and two other small departments (Seine-Saint-Denis and Val-de-Marne) form an inner ring around Paris, known as the Petite Couronne (literal translation: "Little Crown"). Together with the City of Paris, they are included in Greater Paris since 1 January 2016. It is the Smallest Department in France followed by Seine-Saint-Denis and Val-de-Marne. It is slightly smaller than Maldives.

Hauts-de-Seine comprises three departmental arrondissements and 36 communes:

Map number	Name	Area (km)	Population (2019)	Coat of arms	Arrondissement	Map	Labelled map
1	Antony	9.56	62,760		Antony
2	Châtenay-Malabry	6.38	34,021
3	Sceaux	3.6	20,004
4	Bourg-la-Reine	1.86	21,050
5	Bagneux	4.19	40,936
6	Fontenay-aux-Roses	2.51	25,531
7	Le Plessis-Robinson	3.43	30,061
8	Clamart	8.77	52,925
9	Châtillon	2.92	36,639
10	Montrouge	2.07	48,352
11	Malakoff	2.07	30,950
12	Vanves	1.56	27,846		Boulogne-Billancourt
13	Issy-les-Moulineaux	4.25	67,981
14	Boulogne-Billancourt	6.17	121,583
15	Meudon	9.9	45,818
16	Sèvres	3.91	23,463
17	Chaville	3.55	20,771
18	Ville-d'Avray	3.67	11,225
20	Marnes-la-Coquette	3.48	1,774
19	Saint-Cloud	7.56	30,012		Nanterre
21	Vaucresson	3.08	8,683
22	Garches	2.69	17,795
23	Rueil-Malmaison	14.7	78,317
24	Suresnes	3.79	49,311
25	Puteaux	3.19	45,157
26	Nanterre	12.19	96,277
27	Colombes	7.81	86,534
28	La Garenne-Colombes	1.78	29,642
29	Bois-Colombes	1.92	28,841
30	Courbevoie	4.17	81,558
31	Neuilly-sur-Seine	3.73	59,599
32	Levallois-Perret	2.41	66,082
33	Clichy	3.08	63,089
34	Asnières-sur-Seine	4.82	87,143
35	Gennevilliers	11.64	48,530
36	Villeneuve-la-Garenne	3.2	24,097

Hauts-de-Seine currently has the fewest number of any communes in Metropolitan France. With only 36 communes, not including Paris which has only one commune, this makes the French department in Metropolitan France with the fewest number of communes.

Hauts-de-Seine is one of France's wealthiest departments and one of Europe's richest areas. Its GDP per capita was €106,800 in 2020, according to Eurostat official figures.

In both local and national elections, the department predominantly supports centre-right political candidates, though the 1st and 11th constituencies favor the left.

Hauts-de-Seine was the political base of Nicolas Sarkozy, President of the French Republic from 2007 to 2012. He was the mayor of Neuilly-sur-Seine (1983–2002) and president of the Departmental Council of Hauts-de-Seine (2004–2007) before he assumed the office. Sarkozy had succeeded Charles Pasqua as president of the Departmental Council.

In the 1990s and early 2000s, Hauts-de-Seine received national media attention as the result of a corruption scandal concerning the misuse of public funds provided for the department's housing projects. Implicated were Charles Pasqua, as well as other personalities of the Rally for the Republic (RPR) party.

Hauts-de-Seine is governed by a departmental council. Its 46 members are called departmental councillors. The electorate of Hauts-de-Seine usually votes for right-wing parties; there has never been a left-wing majority since the department's inception in 1968.

The departmental council is the deliberative organ of the department. The executive is led by the council president, assisted by vice presidents, in charge of various portfolios. Departmental councillors are elected (two per canton) by the department's inhabitants for six-year terms (no term limits). The president of the Departmental Council is Georges Siffredi, elected in 2020.

Election		Winning Candidate	Party	%	2nd Place Candidate	Party	%
	2022	Emmanuel Macron	LREM	80.39	Marine Le Pen	FN	19.61
	2017	Emmanuel Macron	LREM	85.65	Marine Le Pen	FN	14.35
	2012	Nicolas Sarkozy	UMP	50.52	François Hollande	PS	49.48
	2007	Nicolas Sarkozy	UMP	55.65	Ségolène Royal	PS	44.35
	2002	Jacques Chirac	RPR	87.99	Jean-Marie Le Pen	FN	12.01
	1995	Jacques Chirac	RPR	57.25	Lionel Jospin	PS	42.75

Hauts-de-Seine elected the following members of the National Assembly in the 2017 legislative election:

Constituency		Member	Party
	Hauts-de-Seine's 1st constituency	Elsa Faucillon	French Communist Party
	Hauts-de-Seine's 2nd constituency	Adrien Taquet	La République En Marche!
	Hauts-de-Seine's 3rd constituency	Christine Hennion	La République En Marche!
	Hauts-de-Seine's 4th constituency	Isabelle Florennes	La République En Marche!
	Hauts-de-Seine's 5th constituency	Céline Calvez	La République En Marche!
	Hauts-de-Seine's 6th constituency	Constance Le Grip	The Republicans
	Hauts-de-Seine's 7th constituency	Jacques Marilossian	La République En Marche!
	Hauts-de-Seine's 8th constituency	Jacques Maire	La République En Marche!
	Hauts-de-Seine's 9th constituency	Thierry Solère	The Republicans
	Hauts-de-Seine's 10th constituency	Florence Provendier	La République En Marche!
	Hauts-de-Seine's 11th constituency	Laurianne Rossi	La République En Marche!
	Hauts-de-Seine's 12th constituency	Jean-Louis Bourlanges	Democratic Movement
	Hauts-de-Seine's 13th constituency	Frédérique Dumas	La République En Marche!

In the Senate, Hauts-de-Seine is represented by:

• André Gattolin (LREM), since 2011
• Xavier Iacovelli (LREM), since 2017
• Roger Karoutchi (LR), since 2009
• Christine Lavarde (LR), since 2017
• Hervé Marseille (UDI), since 2011
• Pierre Ouzoulias (PCF), since 2017
• Philippe Pemezec (LR), since 2017

• Tourist attractions
• 
  Empress Joséphine's bedroom at the Château de Malmaison
• 
  Grande Fontaine of the Parc de Saint-Cloud
• 
  Cité de la céramique in Sèvres
• 
  Japanese garden at the Musée Albert-Kahn in Boulogne-Billancourt
• 
  Decauville 0-4-0 wt steam locomotive, Hauts-de-Seine, France

• (in French) Website of the Departmental council
• (in French) Prefecture website