# Top 30 public sector organisations in the Seine-Maritime department

Tamtam tracks 65 public sector organisations headquartered in the Seine-Maritime department. This list ranks the 30 largest by number of employees on LinkedIn, led by CHU de Rouen, Université de Rouen and DEPARTEMENT DE LA SEINE-MARITIME. Their median headcount is 469. Half of them were founded in 1985 or later. The most common headquarters are Rouen (10), Le Havre (7) and Mont-Saint-Aignan (3).

These organizations in Seine-Maritime are predominantly public sector entities, including large hospitals, universities, and government administrations. They are generally large groups, with employee numbers ranging from several hundred to several thousand. CHU de Rouen, for example, is a large hospital network, while Université de Rouen provides higher education in various disciplines. HAROPA PORT manages a major river-maritime port network, and DEPARTEMENT DE LA SEINE-MARITIME provides essential social services.

The data shows a strong concentration of these organizations in Rouen, with many having their headquarters there. Other cities like Le Havre and Mont-Saint-Aignan also host significant public sector entities. The industries represented are primarily healthcare, education, and government administration, reflecting the core public services provided in the region.

🇫🇷 Seine-Maritime · 30 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [CHU de Rouen](https://www.tamtam.ai/c/chu-de-rouen) (chu-rouen.fr)<br>Large hospital network providing patient care, medical education, and research, supporting regional healthcare and training future health professionals. | Hospitals and Health Care | 🇫🇷 Rouen | 3,823 |  |
| 2 | [Université de Rouen](https://www.tamtam.ai/c/universite-de-rouen) (univ-rouen.fr)<br>Offers education in law, economics, management, humanities, health, sports, sciences, and technology disciplines. | Higher Education | 🇫🇷 Mont-Saint-Aignan | 3,200 | 1966 |
| 3 | [DEPARTEMENT DE LA SEINE-MARITIME](https://www.tamtam.ai/c/departement-de-la-seine-maritime) (seinemaritime.fr)<br>Provides essential social services, manages departmental roads, supports local communities, and promotes education, culture, economic development, and tourism in the region. | Government Administration | 🇫🇷 Rouen | 1,450 |  |
| 4 | [Université Le Havre Normandie](https://www.tamtam.ai/c/universite-le-havre-normandie) (univ-lehavre.fr)<br>Educates seven thousand students through specialized departments in international affairs, logistics, engineering, humanities, and sciences focused on human and professional development. | Higher Education | 🇫🇷 Le Havre | 1,042 | 1984 |
| 5 | [Groupe Hospitalier du Havre - GHH](https://www.tamtam.ai/c/groupe-hospitalier-du-havre-ghh) (ch-havre.fr)<br>Leading healthcare provider, comprehensive care, advanced medical technology, collaboration with other hospitals, diverse medical professions, round-the-clock technical platform. | Hospitals and Health Care | 🇫🇷 Montivilliers | 893 | 1669 |
| 6 | [HAROPA PORT](https://www.tamtam.ai/c/haropa-port) (haropaport.com)<br>Manages a major French river-maritime port network, connecting international shipping with a vast hinterland, handling significant maritime and river traffic. | Transportation, Logistics, Supply Chain and Storage | 🇫🇷 Le Havre | 892 | 2021 |
| 7 | [Métropole Rouen Normandie](https://www.tamtam.ai/c/metropole-rouen-normandie) (metropole-rouen-normandie.fr)<br>Manages 71 communes, providing essential services like water, transport, waste, promoting local development, tourism, and actively addressing climate change. | Government Administration | 🇫🇷 Rouen | 886 | 2015 |
| 8 | [District scolaire francophone Sud](https://www.tamtam.ai/c/district-scolaire-francophone-sud) (francophonesud.nbed.nb.ca)<br>A French school district in New Brunswick with over 17,000 students in 38 schools, focusing on academic success, Acadian identity, and overall well-being of students and staff | Education | 🇫🇷 Dieppe | 662 |  |
| 9 | [SDIS 76 - Sapeurs-pompiers de la Seine-Maritime](https://www.tamtam.ai/c/sdis-76-sapeurs-pompiers-de-la-seine-maritime) (sdis76.fr)<br>Departmental organization managing emergency services, including fire fighting, victim rescue, risk prevention, and specialized interventions in hazardous environments. | Public Safety | 🇫🇷 Yvetot | 657 |  |
| 10 | [IDEFHI](https://www.tamtam.ai/c/idefhi) (idefhi.fr)<br>A public institution focused on child protection and disability services in Seine-Maritime, offering support for children, adolescents, and adults with disabilities | Community Services | 🇫🇷 Canteleu | 648 | 2008 |
| 11 | [Ville de Rouen](https://www.tamtam.ai/c/ville-de-rouen) (rouen.fr)<br>Leading urban center in Normandy, Rouen offers a vibrant cultural scene and diverse activities Committed to quality of life, innovation and community engagement | Government Administration | 🇫🇷 Rouen | 597 |  |
| 12 | [Carsat Normandie](https://www.tamtam.ai/c/carsat-normandie) (carsat-normandie.fr)<br>Provides retirement, social action, and occupational health services. Manages substantial retirement payments, social support, and workplace prevention across the region. | Government Administration | 🇫🇷 Rouen | 552 |  |
| 13 | [Le Havre Seine Métropole](https://www.tamtam.ai/c/le-havre-seine-metropole) (lehavreseinemetropole.fr)<br>This Metropolis aims for excellence through innovation in economy, society, and environment. It focuses on green and blue economy, higher education, and tourism, serving its 275,000 inhabitants. | Government Administration | 🇫🇷 Le Havre | 527 | 2019 |
| 14 | [INSA Rouen Normandie](https://www.tamtam.ai/c/insa-rouen-normandie) (insa-rouen.fr)<br>Leading engineering institution providing 9 engineering programs, conducting research across 9 laboratories, and promoting scientific culture, focusing on risk management. | Higher Education | 🇫🇷 Saint-Étienne-du-Rouvray | 511 |  |
| 15 | [Habitat 76](https://www.tamtam.ai/c/habitat-76) (habitat76.fr)<br>Manages over 28,000 social housing units across 190 municipalities, focusing on access, maintenance, and eco-efficient solutions for sustainable living. | Real Estate | 🇫🇷 Rouen | 469 | 1919 |
| 16 | [ENSM, École Nationale Supérieure Maritime](https://www.tamtam.ai/c/ensm-ecole-nationale-superieure-maritime) (supmaritime.fr)<br>Educates Merchant Navy Officers and Marine Engineers, covering navigation, maritime operations, and safety, with practical experience through internships and partnerships. | Higher Education | 🇫🇷 Le Havre | 381 | 1571 |
| 17 | [Centre hospitalier intercommunal Elbeuf Louviers Val de Reuil](https://www.tamtam.ai/c/centre-hospitalier-intercommunal-elbeuf-louviers-val-de-reuil) (chi-elbeuf-louviers.fr)<br>Public healthcare facility in Normandy with 1083 beds, 2143 staff including 267 medical personnel, two hospital sites, maternity, and five nursing homes. | Hospitals and Health Care | 🇫🇷 Saint-Aubin-lès-Elbeuf | 291 | 1989 |
| 18 | [Greta Rouen Maritime](https://www.tamtam.ai/c/greta-rouen-maritime) (greta.ac-normandie.fr)<br>A company providing a wide range of vocational training programs through a network of 250 centers, offering over 280 courses to 2000+ individuals annually | Professional Training and Coaching | 🇫🇷 Mont-Saint-Aignan | 286 | 1974 |
| 19 | [Alcéane](https://www.tamtam.ai/c/alceane) (alceane.fr)<br>Manage over 15,000 social housing units across 17 municipalities, housing 32,000 tenants, focusing on construction, rehabilitation, and social cohesion. | Real Estate | 🇫🇷 Le Havre | 200 |  |
| 20 | [IFA CAMPUS MARCEL SAUVAGE](https://www.tamtam.ai/c/ifa-campus-marcel-sauvage) (ifa-rouen.fr)<br>A professional training institution offering apprenticeships and courses in various fields to meet the needs of local businesses and job seekers | Education Administration Programs | 🇫🇷 Mont-Saint-Aignan | 163 | 1982 |
| 21 | [CCI Rouen Métropole](https://www.tamtam.ai/c/cci-rouen-metropole) (rouen-metropole.cci.fr)<br>Supporting businesses at every stage from creation to growth to transfer, representing and animating the economic life of 25,000 companies in various sectors | Government Administration | 🇫🇷 Rouen | 156 |  |
| 22 | [Opéra Orchestre Normandie Rouen](https://www.tamtam.ai/c/opera-orchestre-normandie-rouen) (linktr.ee)<br>Main cultural institution in Normandy producing and programming opera, symphony, chamber music, contemporary dance, and jazz performances with permanent orchestra. | Performing Arts | 🇫🇷 Rouen | 144 | 1998 |
| 23 | [Ville de Grand Quevilly](https://www.tamtam.ai/c/ville-de-grand-quevilly) (grandquevilly.fr)<br>Provides local government administration, public services, community development, and support for residents and businesses in Grand Quevilly. | Government Administration | 🇫🇷 Le Grand-Quevilly | 138 |  |
| 24 | [Assurance Maladie de la Seine-Maritime](https://www.tamtam.ai/c/assurance-maladie-de-la-seine-maritime) (ameli.fr)<br>A leading social protection organization in the Rouen-Elbeuf-Dieppe area, ensuring universal access to healthcare rights, promoting health preservation, and improving healthcare efficiency | Government Administration | 🇫🇷 Rouen | 137 | 1945 |
| 25 | [Ville de Montivilliers](https://www.tamtam.ai/c/ville-de-montivilliers) (ville-montivilliers.fr)<br>This company located in Montivilliers, France, focuses on sustainable development, culture, sports, education, and community engagement in a dynamic and inclusive environment | Government Administration | 🇫🇷 Montivilliers | 133 |  |
| 26 | [EPA HELEN KELLER](https://www.tamtam.ai/c/epa-helen-keller)<br>A public institution providing support and care to children and adults with disabilities through various services and specialized programs | Civic and Social Organizations | 🇫🇷 Le Havre | 124 | 2017 |
| 27 | [Ville de Petit-Quevilly](https://www.tamtam.ai/c/ville-de-petit-quevilly) (petit-quevilly.fr)<br>Official social media channels for local government communication, community engagement, and public information sharing in Petit-Quevilly. | Government Administration | 🇫🇷 Le Petit-Quevilly | 124 |  |
| 28 | [Les Escales - EHPAD publics du Havre](https://www.tamtam.ai/c/les-escales-ehpad-publics-du-havre) (ehpad-lesescales.fr)<br>Les Escales provides specialized care for elderly residents in Le Havre through 6 public nursing homes, alongside home care services | Hospitals and Health Care | 🇫🇷 Le Havre | 115 | 2016 |
| 29 | [Rouen Habitat](https://www.tamtam.ai/c/rouen-habitat)<br>Public housing office managing 7,900 homes, focusing on social inclusion, energy efficiency, rehabilitation, and diverse housing options in Rouen. | Real Estate | 🇫🇷 Rouen | 104 | 1930 |
| 30 | [Institut national des Sciences appliquées de Rouen](https://www.tamtam.ai/c/institut-national-des-sciences-appliquees-de-rouen) (insa-rouen.fr)<br>It is a prominent engineering school in Normandy, offering diverse programs, conducting research, and fostering strong industry partnerships for future engineers. | Higher Education | 🇫🇷 Saint-Étienne-du-Rouvray | 101 | 1985 |

## 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.

## More company lists in the Seine-Maritime department

- [The largest companies in the Seine-Maritime department](https://www.tamtam.ai/l/largest-companies-seine-maritime) (918)
- [Retail chains in the Seine-Maritime department](https://www.tamtam.ai/l/retail-chains-seine-maritime) (97)
- [Multinational companies in the Seine-Maritime department](https://www.tamtam.ai/l/multinational-companies-seine-maritime) (89)
- [Manufacturers in the Seine-Maritime department](https://www.tamtam.ai/l/manufacturers-seine-maritime) (72)
- [Companies with in-house R&D in the Seine-Maritime department](https://www.tamtam.ai/l/r-and-d-companies-seine-maritime) (67)
- [Distributors and wholesalers in the Seine-Maritime department](https://www.tamtam.ai/l/distributors-and-wholesalers-seine-maritime) (53)
- [Professional services firms in the Seine-Maritime department](https://www.tamtam.ai/l/professional-services-firms-seine-maritime) (51)
- [Critical infrastructure operators in the Seine-Maritime department](https://www.tamtam.ai/l/critical-infrastructure-operators-seine-maritime) (46)
- [Family-owned companies in the Seine-Maritime department](https://www.tamtam.ai/l/family-owned-companies-seine-maritime) (44)
- [IT services companies in the Seine-Maritime department](https://www.tamtam.ai/l/it-services-companies-seine-maritime) (40)
- [Hardware manufacturers in the Seine-Maritime department](https://www.tamtam.ai/l/hardware-companies-seine-maritime) (38)
- [Education providers in the Seine-Maritime department](https://www.tamtam.ai/l/education-companies-seine-maritime) (36)
- [Healthcare providers in the Seine-Maritime department](https://www.tamtam.ai/l/healthcare-providers-seine-maritime) (34)
- [Logistics companies in the Seine-Maritime department](https://www.tamtam.ai/l/logistics-companies-seine-maritime) (34)
- [Financial services firms in the Seine-Maritime department](https://www.tamtam.ai/l/financial-services-firms-seine-maritime) (32)
- [IT Services and IT Consulting companies in the Seine-Maritime department](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-seine-maritime) (30)
- [Real Estate companies in the Seine-Maritime department](https://www.tamtam.ai/l/real-estate-companies-seine-maritime) (30)
- [Higher Education companies in the Seine-Maritime department](https://www.tamtam.ai/l/higher-education-companies-seine-maritime) (28)
- [Software Development companies in the Seine-Maritime department](https://www.tamtam.ai/l/software-development-companies-seine-maritime) (28)
- [Government Administration companies in the Seine-Maritime department](https://www.tamtam.ai/l/government-administration-companies-seine-maritime) (27)
- [Industrial Machinery Manufacturing companies in the Seine-Maritime department](https://www.tamtam.ai/l/industrial-machinery-manufacturing-companies-seine-maritime) (27)
- [Consulting firms in the Seine-Maritime department](https://www.tamtam.ai/l/consulting-firms-seine-maritime) (26)
- [Hospitals and Health Care companies in the Seine-Maritime department](https://www.tamtam.ai/l/hospitals-and-health-care-companies-seine-maritime) (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) (427)
- [Public sector organisations in Provence-Alpes-Côte d'Azur](https://www.tamtam.ai/l/public-sector-organisations-provence-alpes-cote-dazur) (384)
- [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) (185)
- [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)
- [Public sector organisations in Brittany](https://www.tamtam.ai/l/public-sector-organisations-brittany) (165)
- [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 Isère department](https://www.tamtam.ai/l/public-sector-organisations-isere) (80)
- [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)

## The same list elsewhere

- [Public sector organisations in the world](https://www.tamtam.ai/l/public-sector-organisations-in-the-world) (18,493)
- [Public sector organisations in Europe](https://www.tamtam.ai/l/public-sector-organisations-in-europe) (8,568)

---

Source: https://www.tamtam.ai/l/public-sector-organisations-seine-maritime