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.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
CHU de Rouenchu-rouen.fr
Large hospital network providing patient care, medical education, and research, supporting regional healthcare and training future health professionals. |
3,823 | |||
| 2 |
Université de Rouenuniv-rouen.fr
Offers education in law, economics, management, humanities, health, sports, sciences, and technology disciplines. |
3,200 | |||
| 3 |
DEPARTEMENT DE LA SEINE-MARITIMEseinemaritime.fr
Provides essential social services, manages departmental roads, supports local communities, and promotes education, culture, economic development, and tourism in the region. |
1,450 | |||
| 4 |
Université Le Havre Normandieuniv-lehavre.fr
Educates seven thousand students through specialized departments in international affairs, logistics, engineering, humanities, and sciences focused on human and professional development. |
1,042 | |||
| 5 |
Groupe Hospitalier du Havre - GHHch-havre.fr
Leading healthcare provider, comprehensive care, advanced medical technology, collaboration with other hospitals, diverse medical professions, round-the-clock technical platform. |
893 | |||
| 6 |
HAROPA PORTharopaport.com
Manages a major French river-maritime port network, connecting international shipping with a vast hinterland, handling significant maritime and river traffic. |
892 | |||
| 7 |
Métropole Rouen Normandiemetropole-rouen-normandie.fr
Manages 71 communes, providing essential services like water, transport, waste, promoting local development, tourism, and actively addressing climate change. |
886 | |||
| 8 |
District scolaire francophone Sudfrancophonesud.nbed.nb.ca
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 |
662 | |||
| 9 |
SDIS 76 - Sapeurs-pompiers de la Seine-Maritimesdis76.fr
Departmental organization managing emergency services, including fire fighting, victim rescue, risk prevention, and specialized interventions in hazardous environments. |
657 | |||
| 10 | 648 | ||||
| 11 |
Ville de Rouenrouen.fr
Leading urban center in Normandy, Rouen offers a vibrant cultural scene and diverse activities Committed to quality of life, innovation and community engagement |
597 | |||
| 12 |
Carsat Normandiecarsat-normandie.fr
Provides retirement, social action, and occupational health services. Manages substantial retirement payments, social support, and workplace prevention across the region. |
552 | |||
| 13 |
Le Havre Seine Métropolelehavreseinemetropole.fr
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. |
527 | |||
| 14 |
INSA Rouen Normandieinsa-rouen.fr
Leading engineering institution providing 9 engineering programs, conducting research across 9 laboratories, and promoting scientific culture, focusing on risk management. |
511 | |||
| 15 |
Habitat 76habitat76.fr
Manages over 28,000 social housing units across 190 municipalities, focusing on access, maintenance, and eco-efficient solutions for sustainable living. |
469 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 16 |
ENSM, École Nationale Supérieure Maritimesupmaritime.fr
Educates Merchant Navy Officers and Marine Engineers, covering navigation, maritime operations, and safety, with practical experience through internships and partnerships. |
381 | |||
| 17 |
Centre hospitalier intercommunal Elbeuf Louviers Val de Reuilchi-elbeuf-louviers.fr
Public healthcare facility in Normandy with 1083 beds, 2143 staff including 267 medical personnel, two hospital sites, maternity, and five nursing homes. |
291 | |||
| 18 |
Greta Rouen Maritimegreta.ac-normandie.fr
A company providing a wide range of vocational training programs through a network of 250 centers, offering over 280 courses to 2000+ individuals annually |
286 | |||
| 19 |
Alcéanealceane.fr
Manage over 15,000 social housing units across 17 municipalities, housing 32,000 tenants, focusing on construction, rehabilitation, and social cohesion. |
200 | |||
| 20 |
IFA CAMPUS MARCEL SAUVAGEifa-rouen.fr
A professional training institution offering apprenticeships and courses in various fields to meet the needs of local businesses and job seekers |
163 | |||
| 21 |
CCI Rouen Métropolerouen-metropole.cci.fr
Supporting businesses at every stage from creation to growth to transfer, representing and animating the economic life of 25,000 companies in various sectors |
156 | |||
| 22 |
Opéra Orchestre Normandie Rouenlinktr.ee
Main cultural institution in Normandy producing and programming opera, symphony, chamber music, contemporary dance, and jazz performances with permanent orchestra. |
144 | |||
| 23 |
Ville de Grand Quevillygrandquevilly.fr
Provides local government administration, public services, community development, and support for residents and businesses in Grand Quevilly. |
138 | |||
| 24 |
Assurance Maladie de la Seine-Maritimeameli.fr
A leading social protection organization in the Rouen-Elbeuf-Dieppe area, ensuring universal access to healthcare rights, promoting health preservation, and improving healthcare efficiency |
137 | |||
| 25 |
Ville de Montivilliersville-montivilliers.fr
This company located in Montivilliers, France, focuses on sustainable development, culture, sports, education, and community engagement in a dynamic and inclusive environment |
133 | |||
| 26 |
EPA HELEN KELLER
A public institution providing support and care to children and adults with disabilities through various services and specialized programs |
124 | |||
| 27 |
Ville de Petit-Quevillypetit-quevilly.fr
Official social media channels for local government communication, community engagement, and public information sharing in Petit-Quevilly. |
124 | |||
| 28 |
Les Escales - EHPAD publics du Havreehpad-lesescales.fr
Les Escales provides specialized care for elderly residents in Le Havre through 6 public nursing homes, alongside home care services |
115 | |||
| 29 |
Rouen Habitat
Public housing office managing 7,900 homes, focusing on social inclusion, energy efficiency, rehabilitation, and diverse housing options in Rouen. |
104 | |||
| 30 |
Institut national des Sciences appliquées de Roueninsa-rouen.fr
It is a prominent engineering school in Normandy, offering diverse programs, conducting research, and fostering strong industry partnerships for future engineers. |
101 | |||
Turn this list into pipeline
Tamtam finds the decision-makers at every company on a list like this one, with verified emails, phone numbers and the buying signals that tell you when to reach out.
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 918
- Retail chains in the Seine-Maritime department 97
- Multinational companies in the Seine-Maritime department 89
- Manufacturers in the Seine-Maritime department 72
- Companies with in-house R&D in the Seine-Maritime department 67
- Distributors and wholesalers in the Seine-Maritime department 53
- Professional services firms in the Seine-Maritime department 51
- Critical infrastructure operators in the Seine-Maritime department 46
- Family-owned companies in the Seine-Maritime department 44
- IT services companies in the Seine-Maritime department 40
- Hardware manufacturers in the Seine-Maritime department 38
- Education providers in the Seine-Maritime department 36
- Healthcare providers in the Seine-Maritime department 34
- Logistics companies in the Seine-Maritime department 34
- Financial services firms in the Seine-Maritime department 32
- IT Services and IT Consulting companies in the Seine-Maritime department 30
- Real Estate companies in the Seine-Maritime department 30
- Higher Education companies in the Seine-Maritime department 28
- Software Development companies in the Seine-Maritime department 28
- Government Administration companies in the Seine-Maritime department 27
- Industrial Machinery Manufacturing companies in the Seine-Maritime department 27
- Consulting firms in the Seine-Maritime department 26
- Hospitals and Health Care companies in the Seine-Maritime department 25
The same list elsewhere in France
- Public sector organisations in France 4,006
- Public sector organisations in Île-de-France 993
- Public sector organisations in Auvergne-Rhône-Alpes 451
- Public sector organisations in Grand Est 427
- Public sector organisations in Provence-Alpes-Côte d'Azur 384
- Public sector organisations in Occitanie 317
- Public sector organisations in Nouvelle-Aquitaine 310
- Public sector organisations in Hauts-de-France 261
- Public sector organisations in Pays de la Loire 185
- Public sector organisations in the Bouches-du-Rhône department 183
- Public sector organisations in Normandy 166
- Public sector organisations in Brittany 165
- Public sector organisations in the Nord department 135
- Public sector organisations in Bourgogne-Franche-Comté 130
- Public sector organisations in Centre-Val de Loire 121
- Public sector organisations in the Rhône department 120
- Public sector organisations in the Haute-Garonne department 111
- Public sector organisations in the Gironde department 109
- Public sector organisations in the Hauts-de-Seine department 96
- Public sector organisations in the Seine-Saint-Denis department 91
- Public sector organisations in the Isère department 80
- Public sector organisations in Paris 460
- Public sector organisations in Marseille 103
- Public sector organisations in Toulouse 83