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The 30 largest public sector organisations in the Yvelines department

Tamtam tracks 65 public sector organisations headquartered in the Yvelines department. This list ranks the 30 largest by number of employees on LinkedIn, led by Département des Yvelines, Académie de Versailles and UVSQ Université de Versailles Saint-Quentin-en-Yvelines. Their median headcount is 324. Half of them were founded in 1972 or later. The most common headquarters are Versailles (18) and Plaisir (3).

🇫🇷 Yvelines30 companiesUpdated Nov 12, 2026

These public sector organizations in Yvelines are primarily involved in government administration, education, healthcare, and cultural heritage. They range from large departmental bodies like the Département des Yvelines, which provides social support and education, to specialized institutions such as the Château de Versailles, maintaining cultural heritage. Mid-sized entities like UVSQ Université de Versailles Saint-Quentin-en-Yvelines focus on higher education and research, while SDIS 78 manages fire and rescue services.

A notable pattern among these organizations is their strong concentration in Versailles, which serves as the headquarters for many, including the Académie de Versailles, overseeing education, and the Ville de Versailles itself. Other significant entities like Hôpital de Poissy-Saint-Germain-en-Laye and Pôle Emploi are based in nearby towns such as Poissy and Plaisir, indicating a regional distribution of essential public services.

#CompanyIndustryHeadquarters EmployeesFounded
1
Département des Yvelinesyvelines.fr

Local government providing social support, education, mobility, and territorial development services to improve daily life for residents.

Government Administration 🇫🇷 Versailles 4,000 1964
2
Académie de Versaillesac-versailles.fr

The company oversees education in four departments, serving 11 million students and managing 90,000 employees in various roles

Primary and Secondary Education 🇫🇷 Versailles 2,769 1972
3
UVSQ Université de Versailles Saint-Quentin-en-Yvelinesuvsq.fr

Provides diverse higher education, conducts innovative research across various fields, and fosters technological advancements with strong industry and international partnerships.

Research Services 🇫🇷 Versailles 2,170 1991
4
SDIS 78sdis78.fr

Public establishment managing fire and rescue services in Yvelines, under mayors and prefects. Responsible for operations, personnel, and equipment.

Government Administration 🇫🇷 Versailles 1,061 1996
5
Service d’infrastructure de la Défensedefense.gouv.fr

Manages, builds, and maintains the French Ministry of Armed Forces' real estate, ensuring infrastructure support and energy control for military operations domestically and abroad.

Construction 🇫🇷 Versailles 850 2005
6
Ville de Versaillesversailles.fr

A historic city known for its palace and gardens, offering a vibrant local economy, employment opportunities in various fields, and a high quality of life

Government Administration 🇫🇷 Versailles 757 n/a
7
Château de Versailleschateauversailles.fr

The company is a public institution maintaining and showcasing cultural heritage like the Versailles Palace, Trianon, gardens, and Marly domain They collaborate with various organizations

Museums, Historical Sites, and Zoos 🇫🇷 Versailles 732 1623
8
Hôpital de Poissy-Saint-Germain-en-Layeghtyvelinesnord.fr

Public hospital in Yvelines, France, providing healthcare, education, and research across eight specialized care poles for all ages

Hospitals and Health Care 🇫🇷 Poissy 636 n/a
9
Pôle Emploipole-emploi.fr

Distributor of IKON, a platform helping companies improve IT service performance and business activities through unified real-time monitoring and data management.

Government Administration 🇫🇷 Plaisir 511 n/a
10
CPAM des Yvelinesameli.fr

A private organization serving the CNAM for public service, protecting over 15 million individuals by implementing healthcare policies locally in Yvelines

Government Administration 🇫🇷 Versailles 480 1981
11
Grand Paris Seine & Oisegpseo.fr

management of a large urban and rural territory focusing on economic sectors, innovation, infrastructure, environment, and public services organization

Government Administration 🇫🇷 Aubergenville 429 2016
12
Centre Hospitalier de Plaisirch-plaisir.fr

Provides diverse, specialized hospital and outpatient care in South Yvelines, including radiology, MRI, and CT scans, focusing on gerontological, medico-social, and mental health.

Hospitals and Health Care 🇫🇷 Plaisir 349 n/a
13
Centre hospitalier de Rambouilletch-rambouillet.fr

Provides diverse medical services including imaging, surgery, cardiology, dialysis, emergency care, and laboratory support for local population.

Hospitals and Health Care 🇫🇷 Rambouillet 345 1731
14
Crous de Versaillescrous-versailles.fr

State operator in charge of all student life aspects, serving 206,000 students in the Versailles academic region through 700 agents

Government Administration 🇫🇷 Versailles 344 1955
15
Woodford County Public Schoolsbeechwood.kyschools.us

A highly reputable and long-standing educational institution known for its outstanding academic performance in the state

Primary and Secondary Education 🇫🇷 Versailles 324 1852

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16
Cour d'appel de Versailles (78)cours-appel.justice.fr

The Court of Appeal of Versailles is a judicial institution handling appeals from lower courts within a jurisdiction covering 4 departments

Courts of Law 🇫🇷 Versailles 307 1975
17
Lycée Jules Ferrylyc-ferry-versailles.ac-versailles.fr

The company is a high school providing diverse educational pathways in science, technology, literature, languages, humanities, and social sciences to around 2000 students

Education Administration Programs 🇫🇷 Versailles 262 1907
18
Hôpital de Mantes-la-Jolieghtyvelinesnord.fr

Provides comprehensive, specialized hospital care, day hospital and outpatient surgery, accommodation beds, and various specialized consultations, as part of a public hospital group.

Hospitals and Health Care 🇫🇷 Mantes-la-Jolie 253 n/a
19
Lycée Hochelyc-hoche-versailles.ac-versailles.fr

College, high school, and preparatory classes provider based in Versailles, France since 1803 Has a strong alumni association

Primary and Secondary Education 🇫🇷 Versailles 222 1803
20
SIMMT - Structure Intégrée du Maintien en condition opérationnelle des Matériels Terrestresterre.defense.gouv.fr

Manages operational maintenance for land equipment, ensuring availability for military operations, cost coherence, and logistics for army, directorates, and services.

Armed Forces 🇫🇷 Versailles 219 2010
21
Caf des Yvelinescaf.fr

The company is a private organization providing public services in the Yvelines department, handling social benefits, family support, and migrant worker affairs

Government Administration 🇫🇷 Versailles 196 n/a
22
Hôpital de Meulan - Les Mureauxghtyvelinesnord.fr

Provides hospital care, day care, and consultations in various specialties, part of the Yvelines Nord hospital group.

Hospitals and Health Care 🇫🇷 Meulan-en-Yvelines 186 n/a
23
Sciences Po Saint-Germain-en-Layesciencespo-saintgermainenlaye.fr

Sciences Po Saint-Germain-en-Laye is a prestigious French institution providing a five-year program in political sciences, law, economics, history, and more, with a strong commitment to social justice and international experiences

Higher Education 🇫🇷 Saint-Germain-en-Laye 162 2013
24
Ecole nationale supérieure d'architecture de Versaillesarchi.fr

Educates future architects through various degrees, encouraging innovation and interdisciplinary collaboration, offering a vibrant learning environment and international partnerships.

Higher Education 🇫🇷 Versailles 162 1969
25
Ville de Houillesville-houilles.fr

The company is located in Houilles, a friendly city near Paris, focusing on urban development with a strong emphasis on quality of life and community engagement

Government Administration 🇫🇷 Houilles 154 n/a
26
Lycée Marie Curie - Versailleslyc-curie-versailles.ac-versailles.fr

A school in Versailles offering various academic programs to 1,700 students, including general and technological courses, specialized baccalaureates, BTS programs, and a preparatory class for top schools

Education 🇫🇷 Versailles 142 n/a
27
Handi Val de Seinehandivaldeseine.org

A syndicate and management association serving citizens by providing prevention, education, rehabilitation, accommodation, and housing services for people with disabilities

Services for the Elderly and Disabled 🇫🇷 Verneuil-sur-Seine 139 1969
28
Versailles Grand Parcversaillesgrandparc.fr

Versailles Grand Parc supports entrepreneurs and project leaders in urban ecology and innovative mobility, aiming to modernize and enhance their exceptional living environment

Government Administration 🇫🇷 Versailles 135 2003
29
GRETA des Yvelinesgreta-yvelines.fr

A training organization within the National Education system in the Yvelines region, offering continuing education programs, certifications, and professional development services

Professional Training and Coaching 🇫🇷 Plaisir 123 n/a
30
Ville de Maisons-Laffittemaisonslaffitte.fr

Official online platform providing residents and visitors with information about local administration, services, events, and community resources.

Government Administration 🇫🇷 Maisons-Laffitte 112 n/a

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How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026.

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