# Public sector organisations headquartered in the Val-d'Oise department

Tamtam tracks 30 public sector organisations headquartered in the Val-d'Oise department. This list ranks all of them by number of employees on LinkedIn, led by Hôpital Simone Veil - Groupement hospitalier Eaubonne-Montmorency, Centre Hospitalier de Gonesse and Service Départemental d'Incendie et de Secours du Val-d'Oise - SDIS 95. Their median headcount is 104. The most common headquarters are Cergy (6) and Argenteuil (2).

This selection of public sector organizations in Val-d'Oise primarily consists of mid-sized to large entities in healthcare, education, and government administration. Key organizations include Hôpital Simone Veil, a public hospital in Eaubonne-Montmorency offering diverse medical services, and Centre Hospitalier de Gonesse, another public healthcare facility. The Service Départemental d'Incendie et de Secours du Val-d'Oise (SDIS 95) manages emergency services, while CY Tech is a higher education institution in Sciences, Engineering, Economics, and Management.

A notable pattern is the concentration of headquarters in Cergy, which hosts CY Tech, CPAM du Val-d'Oise (part of the national health security system), Ecole nationale supérieure de l'Electronique et de ses Applications, and Val d'Oise Habitat, the leading public housing agency. This suggests Cergy serves as a significant administrative and educational hub within the department.

🇫🇷 Val-d'Oise · 30 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Hôpital Simone Veil - Groupement hospitalier Eaubonne-Montmorency](https://www.tamtam.ai/c/hopital-simone-veil-groupement-hospitalier-eaubonne-montmorency) (hopital-simoneveil.fr)<br>Public hospital offering diverse medical, surgical, pediatric, psychiatric, and elderly care services with advanced equipment and extensive patient support. | Government Administration | 🇫🇷 Eaubonne | 1,008 |  |
| 2 | [Centre Hospitalier de Gonesse](https://www.tamtam.ai/c/centre-hospitalier-de-gonesse) (ch-gonesse.fr)<br>A public healthcare facility in Gonesse, France, serving a population of 350,000 with modern amenities and a long history of providing quality care | Hospitals and Health Care | 🇫🇷 Gonesse | 716 |  |
| 3 | [Service Départemental d'Incendie et de Secours du Val-d'Oise - SDIS 95](https://www.tamtam.ai/c/service-departemental-d-incendie-et-de-secours-du-val-d-oise-sdis-95) (pompiers95.fr)<br>The service department manages emergency services in Val-d’Oise, hiring firefighters and administrative staff to support public safety and rescue operations | Government Administration | 🇫🇷 Neuville-sur-Oise | 711 | 1972 |
| 4 | [CENTRE HOSPITALIER VICTOR DUPOUY](https://www.tamtam.ai/c/centre-hospitalier-victor-dupouy) (ch-argenteuil.fr)<br>A hospital providing comprehensive medical services and care to patients in need of healthcare assistance and treatments | Hospitals and Health Care | 🇫🇷 Argenteuil | 674 |  |
| 5 | [CY Tech](https://www.tamtam.ai/c/cy-tech) (cytech.cyu.fr)<br>CY Tech is a leading institution in Sciences, Engineering, Economics, and Management with multiple campuses, formed from the merger of EISTI and UCP | Higher Education | 🇫🇷 Cergy | 368 | 2020 |
| 6 | [CPAM du Val-d'Oise](https://www.tamtam.ai/c/cpam-du-val-d-oise) (ameli.fr)<br>The company, part of the national health security system, supports over 11 million individuals in accessing healthcare services and managing health expenses | Government Administration | 🇫🇷 Cergy | 338 |  |
| 7 | [Ecole nationale supérieure de l'Electronique et de ses Applications](https://www.tamtam.ai/c/ecole-nationale-superieure-de-l-electronique-et-de-ses-applications) (ensea.fr)<br>This company offers high-quality engineering education with a focus on expertise, inclusivity, and sustainability, fostering innovation and responsible professionals in a supportive environment | Higher Education | 🇫🇷 Cergy | 249 | 1952 |
| 8 | [Val d'Oise Habitat](https://www.tamtam.ai/c/val-d-oise-habitat) (valdoisehabitat.fr)<br>Val d'Oise Habitat manages over 20,000 social housing units, serving as the leading public housing agency in the Val d'Oise department | Real Estate | 🇫🇷 Cergy | 248 | 1969 |
| 9 | [ANCV](https://www.tamtam.ai/c/ancv) (ancv.com)<br>A public establishment managing holiday vouchers to help 33 million employees go on vacation Profits fund holiday programs for disadvantaged populations | Government Administration | 🇫🇷 Sarcelles | 230 |  |
| 10 | [Mairie de Cormeilles-en-Parisis](https://www.tamtam.ai/c/mairie-de-cormeilles-en-parisis) (ville-cormeilles95.fr)<br>Provides information on municipal job and internship opportunities, enabling online applications for positions within the local government administration. | Government Administration | 🇫🇷 Cormeilles-en-Parisis | 155 |  |
| 11 | [IUT de Cergy-Pontoise](https://www.tamtam.ai/c/iut-de-cergy-pontoise) (cyiut.cyu.fr)<br>The company provides personalized academic support, emphasizes industry-recognized degrees, fosters innovation through project-based learning, and offers various educational paths | Higher Education | 🇫🇷 Neuville-sur-Oise | 137 | 1989 |
| 12 | [Mairie d'Ermont](https://www.tamtam.ai/c/mairie-d-ermont) (ermont.fr)<br>Local government providing municipal services, managing city affairs, and offering employment, internships, and apprenticeship opportunities to residents. | Government Administration | 🇫🇷 Ermont | 117 |  |
| 13 | [VILLE DE DEUIL-LA BARRE](https://www.tamtam.ai/c/ville-de-deuil-la-barre) (mairie-deuillabarre.fr)<br>A vibrant city focused on sports, health, culture, social cohesion, safety, and green mobility, fostering a high quality of life. | Government Administration | 🇫🇷 Deuil-la-Barre | 111 | 1789 |
| 14 | [Ville de Villiers-le-Bel](https://www.tamtam.ai/c/ville-de-villiers-le-bel) (ville-villiers-le-bel.fr)<br>Provides municipal services, manages local government operations, offers information and job opportunities to residents and community members. | Government Administration | 🇫🇷 Villiers-le-Bel | 109 |  |
| 15 | [Ville de Pontoise](https://www.tamtam.ai/c/ville-de-pontoise) (ville-pontoise.fr)<br>A historical city with over 32,000 residents, located near Paris, at the heart of the Cergy-Pontoise urban area Visit their website for job opportunities | Government Administration | 🇫🇷 Pontoise | 104 |  |
| 16 | [Ville de Soisy-sous-Montmorency](https://www.tamtam.ai/c/ville-de-soisy-sous-montmorency) (soisy-sous-montmorency.fr)<br>Municipality located in Val d’Oise, offering a privileged living environment near Enghien lake and Montmorency forest, accessible by highway and public transport. | Government Administration | 🇫🇷 Soisy-sous-Montmorency | 98 |  |
| 17 | [Ville de Montigny-lès-Cormeilles](https://www.tamtam.ai/c/ville-de-montigny-les-cormeilles) (montigny95.fr)<br>Dynamic municipality near Paris offering quality public services with innovation, humanism, and social values 450 employees serving the needs of its residents | Government Administration | 🇫🇷 Montigny-lès-Cormeilles | 96 |  |
| 18 | [Ville de Sannois](https://www.tamtam.ai/c/ville-de-sannois) (ville-sannois.fr)<br>The company promotes the town of Sannois, known for its residential area surrounded by hills with green spaces, vineyards, and a windmill from the 18th century | Government Administration | 🇫🇷 Sannois | 75 |  |
| 19 | [Plaine Vallée Agglo](https://www.tamtam.ai/c/plaine-vallee-agglo) (agglo-plainevallee.fr)<br>Intercommunal organization managing 18 communes near Paris, focusing on mobility, education, employment, urban-rural balance, and economic development. | Government Administration | 🇫🇷 Soisy-sous-Montmorency | 74 | 2016 |
| 20 | [Ville de Montmorency](https://www.tamtam.ai/c/ville-de-montmorency) (ville-montmorency.fr)<br>A dynamic municipality near Paris focused on service modernization and innovation, offering extensive public services, recreational facilities, and cultural events | Government Administration | 🇫🇷 Montmorency | 55 |  |
| 21 | [Hôpital Le Parc de Taverny](https://www.tamtam.ai/c/hopital-le-parc-de-taverny) (hopital-parc-taverny.fr)<br>Specialized healthcare facility providing post-acute care and rehabilitation services focused on cardio-pulmonary recovery and patient functional improvement. | Hospitals and Health Care | 🇫🇷 Taverny | 50 |  |
| 22 | [Château de La Roche-Guyon](https://www.tamtam.ai/c/chateau-de-la-roche-guyon) (chateaudelarocheguyon.fr)<br>A cultural heritage site in the heart of French Vexin, offering a unique experience blending history, arts, and sciences to over 76,000 visitors annually | Museums, Historical Sites, and Zoos | 🇫🇷 La Roche-Guyon | 39 | 1994 |
| 23 | [Points communs - Scène nationale Cergy-Pontoise / Val d'Oise](https://www.tamtam.ai/c/points-communs-scene-nationale-cergy-pontoise-val-d-oise) (points-communs.com)<br>A multidisciplinary arts organization in the Paris region, focusing on dance, music, and circus, with a strong emphasis on community engagement and artist residencies | Performing Arts | 🇫🇷 Cergy | 37 | 2018 |
| 24 | [GHT Sud Val d'Oise](https://www.tamtam.ai/c/ght-sud-val-d-oise)<br>A collective of public hospitals in Southern Val d’Oise and Northern Hauts-de-Seine providing coordinated healthcare services with a focus on quality, innovation, and efficiency | Hospitals and Health Care | 🇫🇷 Argenteuil | 32 | 2017 |
| 25 | [Ville de Vauréal](https://www.tamtam.ai/c/ville-de-vaureal) (vaureal.fr)<br>The company is located in Vauréal, offering a peaceful city life with a countryside feel and vibrant urban atmosphere | Government Administration | 🇫🇷 Vauréal | 29 |  |
| 26 | [Lycée Polyvalent - Louis Armand EAUBONNE](https://www.tamtam.ai/c/lycee-polyvalent-louis-armand-eaubonne) (lycee-louis-armand-eaubonne.fr)<br>A versatile high school in Eaubonne offering general and professional education in various sectors such as industry and commerce Visit website for updates | Education | 🇫🇷 Eaubonne | 24 |  |
| 27 | [Château d'Auvers](https://www.tamtam.ai/c/chateau-d-auvers) (chateau-auvers.fr)<br>A historic castle built in 1635, now offering multimedia experiences on Impressionism, hosting events, and team-building activities in its nine-hectare park | Travel Arrangements | 🇫🇷 Auvers-sur-Oise | 18 | 1994 |
| 28 | [PUI CY Transfer](https://www.tamtam.ai/c/pui-cy-transfer) (pui-cy-transfer.fr)<br>Transforms public research into concrete innovations, supports entrepreneurship, and fosters an attractive innovation ecosystem for researchers, students, and businesses. | Research Services | 🇫🇷 Cergy | 14 | 2021 |
| 29 | [Musée National De La Renaissance](https://www.tamtam.ai/c/musee-national-de-la-renaissance) (musee-renaissance.fr)<br>Musee National De La Renaissance is a French museums and institutions company located in Écouen, focusing on Renaissance art and history | Museums, Historical Sites, and Zoos | 🇫🇷 Écouen | 10 |  |
| 30 | [Office de Tourisme d'Enghien-les-Bains](https://www.tamtam.ai/c/office-de-tourisme-d-enghien-les-bains) (enghienlesbains-tourisme.fr)<br>The Enghien-les-Bains Tourism Office provides information and assistance to visitors, promoting the city's thermal waters, recreational activities, cultural amenities, and proximity to Paris | Travel Arrangements | 🇫🇷 Enghien-les-Bains | 9 |  |

## 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 11, 2026.

## More company lists in the Val-d'Oise department

- [The largest companies in the Val-d'Oise department](https://www.tamtam.ai/l/largest-companies-val-doise) (849)
- [Multinational companies in the Val-d'Oise department](https://www.tamtam.ai/l/multinational-companies-val-doise) (128)
- [Companies with in-house R&D in the Val-d'Oise department](https://www.tamtam.ai/l/r-and-d-companies-val-doise) (88)
- [Manufacturers in the Val-d'Oise department](https://www.tamtam.ai/l/manufacturers-val-doise) (85)
- [Hardware manufacturers in the Val-d'Oise department](https://www.tamtam.ai/l/hardware-companies-val-doise) (70)
- [Distributors and wholesalers in the Val-d'Oise department](https://www.tamtam.ai/l/distributors-and-wholesalers-val-doise) (67)
- [Retail chains in the Val-d'Oise department](https://www.tamtam.ai/l/retail-chains-val-doise) (56)
- [Professional services firms in the Val-d'Oise department](https://www.tamtam.ai/l/professional-services-firms-val-doise) (44)
- [Family-owned companies in the Val-d'Oise department](https://www.tamtam.ai/l/family-owned-companies-val-doise) (42)
- [IT services companies in the Val-d'Oise department](https://www.tamtam.ai/l/it-services-companies-val-doise) (42)
- [IT Services and IT Consulting companies in the Val-d'Oise department](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-val-doise) (38)
- [Transportation, Logistics, Supply Chain and Storage companies in the Val-d'Oise department](https://www.tamtam.ai/l/transportation-logistics-supply-chain-and-storage-companies-val-doise) (33)
- [Aerospace and defence companies in the Val-d'Oise department](https://www.tamtam.ai/l/aerospace-and-defense-companies-val-doise) (31)
- [Construction companies in the Val-d'Oise department](https://www.tamtam.ai/l/construction-companies-val-doise) (29)
- [Wholesale companies in the Val-d'Oise department](https://www.tamtam.ai/l/wholesale-companies-val-doise) (29)
- [Healthcare providers in the Val-d'Oise department](https://www.tamtam.ai/l/healthcare-providers-val-doise) (27)
- [Industrial Machinery Manufacturing companies in the Val-d'Oise department](https://www.tamtam.ai/l/industrial-machinery-manufacturing-companies-val-doise) (27)
- [Government Administration companies in the Val-d'Oise department](https://www.tamtam.ai/l/government-administration-companies-val-doise) (26)
- [Logistics companies in the Val-d'Oise department](https://www.tamtam.ai/l/logistics-companies-val-doise) (25)

## The same list elsewhere in France

- [Public sector organisations in France](https://www.tamtam.ai/l/public-sector-organisations-france) (4,006)
- [Public sector organisations in Île-de-France](https://www.tamtam.ai/l/public-sector-organisations-ile-de-france) (993)
- [Public sector organisations in Auvergne-Rhône-Alpes](https://www.tamtam.ai/l/public-sector-organisations-auvergne-rhone-alpes) (451)
- [Public sector organisations in Grand Est](https://www.tamtam.ai/l/public-sector-organisations-grand-est) (425)
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- [Public sector organisations in Occitanie](https://www.tamtam.ai/l/public-sector-organisations-occitanie) (317)
- [Public sector organisations in Nouvelle-Aquitaine](https://www.tamtam.ai/l/public-sector-organisations-nouvelle-aquitaine) (310)
- [Public sector organisations in Hauts-de-France](https://www.tamtam.ai/l/public-sector-organisations-hauts-de-france) (261)
- [Public sector organisations in Pays de la Loire](https://www.tamtam.ai/l/public-sector-organisations-pays-de-la-loire) (187)
- [Public sector organisations in the Bouches-du-Rhône department](https://www.tamtam.ai/l/public-sector-organisations-bouches-du-rhone) (183)
- [Public sector organisations in Normandy](https://www.tamtam.ai/l/public-sector-organisations-normandy) (166)
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- [Public sector organisations in the Nord department](https://www.tamtam.ai/l/public-sector-organisations-nord) (135)
- [Public sector organisations in Bourgogne-Franche-Comté](https://www.tamtam.ai/l/public-sector-organisations-bourgogne-franche-comte) (130)
- [Public sector organisations in Centre-Val de Loire](https://www.tamtam.ai/l/public-sector-organisations-centre-val-de-loire) (121)
- [Public sector organisations in the Rhône department](https://www.tamtam.ai/l/public-sector-organisations-rhone) (120)
- [Public sector organisations in the Haute-Garonne department](https://www.tamtam.ai/l/public-sector-organisations-haute-garonne) (111)
- [Public sector organisations in the Gironde department](https://www.tamtam.ai/l/public-sector-organisations-gironde) (109)
- [Public sector organisations in the Hauts-de-Seine department](https://www.tamtam.ai/l/public-sector-organisations-hauts-de-seine) (96)
- [Public sector organisations in the Seine-Saint-Denis department](https://www.tamtam.ai/l/public-sector-organisations-seine-saint-denis) (91)
- [Public sector organisations in the Loire-Atlantique department](https://www.tamtam.ai/l/public-sector-organisations-loire-atlantique) (82)
- [Public sector organisations in Paris](https://www.tamtam.ai/l/public-sector-organisations-paris) (460)
- [Public sector organisations in Marseille](https://www.tamtam.ai/l/public-sector-organisations-marseille) (103)
- [Public sector organisations in Toulouse](https://www.tamtam.ai/l/public-sector-organisations-toulouse) (83)

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Source: https://www.tamtam.ai/l/public-sector-organisations-val-doise