These public sector organisations in Seine-Saint-Denis are primarily large entities, many of them national in scope. They represent a mix of government administration, higher education, and public transportation. For example, SNCF Réseau manages national railway infrastructure, AFPA is a leading adult professional training organization, and ACOSS supports employers and entrepreneurs.
The data shows a strong concentration of headquarters in Saint-Denis and Montreuil. Several universities, such as Université Sorbonne Paris Nord and Université Paris 8, are also prominent. The presence of entities like Société des grands projets highlights ongoing development in urban transit services.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
SNCF Réseausncf-reseau.fr
public entity managing national railway infrastructure, unifying previous services, ensuring clear governance, and coordinating with railway operator SNCF Mobilités. |
23,115 | |||
| 2 | 19,244 | ||||
| 3 |
SNCF Voyageurssncf-voyageurs.com
SNCF Voyageurs is a subsidiary of the SNCF Group responsible for passenger transportation on the French national railway network |
18,564 | |||
| 4 |
Conseil départemental de la Seine-Saint-Denisseinesaintdenis.fr
The company works to create opportunities for local economic development, ensuring that residents benefit from job initiatives and new actions |
3,255 | |||
| 5 |
ACOSSlinkedin.com
A national organization supports employers and entrepreneurs by advising, informing, and streamlining services, ensuring social protection financing, and promoting responsibility, solidarity, and equity |
3,000 | |||
| 6 |
Agence Régionale de Santé Ile-de-Francelinktr.ee
Implements regional health policy, covering prevention, care, and medico-social support, developed in consultation with professionals and users for efficiency and transparency. |
2,332 | |||
| 7 |
Université Sorbonne Paris Norduniv-spn.fr
A multidisciplinary university located in the northern region of Île-de-France, with campuses in Villetaneuse, Saint-Denis, La Plaine Saint-Denis, Bobigny, and Argenteuil |
2,033 | |||
| 8 |
Université Paris 8univ-paris8.fr
A leading university in Paris, specializing in Arts, Literature, Social Sciences, and Humanities, providing students with tools to understand and engage with the contemporary world |
1,594 | |||
| 9 |
Urssaf Caisse nationaleurssaf.org
Collects contributions from employers, self-employed, and employees to fund social benefits like healthcare, hospitals, and public transport, supporting economic and social development. |
1,470 | |||
| 10 |
Société des grands projetssocietedesgrandsprojets.fr
Development and management of decarbonized transport projects including new metro lines and regional express services to improve daily mobility. |
1,367 | |||
| 11 |
Université Paris 8 Vincennes-Saint-Denisuniv-paris8.fr
Higher education institution specializing in cultural sciences, hosting over 21,000 students, numerous research teams, and doctoral schools in Paris. |
1,177 | |||
| 12 |
Urssaf Ile-de-Francelasecurecrute.fr
Collection and redistribution of social security contributions ensuring workers' social protection and supporting entrepreneurs with compliance and service. |
1,142 | |||
| 13 |
Université Paris 13univ-spn.fr
Higher education institution offering diverse academic programs across four main campuses located in northern Île-de-France region. |
1,049 | |||
| 14 |
Plaine Communeplainecommune.fr
A territory in the Greater Paris region undergoing significant transformation, known for culture, creativity, and hosting events like Paris 2024 Keep updated on social media |
1,017 | |||
| 15 |
Ville de Montreuilmontreuil.fr
Local government providing public services and employment opportunities for residents in a densely populated urban area in Île-de-France. |
823 | |||
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 |
Ville de Saint-Denisville-saint-denis.fr
Local government providing public services, supporting daily life and personal projects for approximately 115,000 residents in Saint-Denis. |
666 | |||
| 17 |
FranceAgriMerfranceagrimer.fr
A national establishment under the French Ministry for Agriculture, providing economic expertise, market monitoring, and strategic support for the agriculture and sea sectors |
636 | |||
| 18 |
SNCF Voyageurs Matérielsncf-voyageurs.com
Manages maintenance for nearly 17,000 rolling stock units. Provides high-level industrial performance, ensuring safety, quality, and technical expertise for internal and external clients. |
606 | |||
| 19 |
Cour nationale du droit d'asile (CNDA)cnda.fr
Specialized administrative court in France responsible for reviewing asylum decisions and appeals against the decisions of the French Office for Refugees and Stateless Persons |
549 | |||
| 20 |
Economat des arméeseconomat-armees.com
Central purchasing and service provider supporting defense administrative units with food supply, collective catering, general goods, transport, and camp management. |
521 | |||
| 21 | 511 | ||||
| 22 |
Grand Paris Expressgrandparisexpress.fr
Public organization creating the new Grand Paris automated metro, responsible for designing, developing, and building the network's infrastructure and stations |
454 | |||
| 23 | 432 | ||||
| 24 |
UGECAM Ile-de-Francegroupe-ugecam.fr
Non-profit organization providing comprehensive health and social care services, supporting rehabilitation and reintegration for individuals with disabilities across various age groups and needs. |
419 | |||
| 25 | 
CENTRE HOSPITALIER DE MONTREUIL HOPITAL ANDRE GREGOIREght-gpne.fr
Medical practice company based in Montreuil, France, providing a range of healthcare services at Hôpital André Grégoire |
388 | |||
| 26 |
Centre Interdépartemental de Gestion de la petite couronne d'Ile de Francecig929394.fr
Provides human resources management services to local authorities and public establishments. Offers HR advice, services, and expert support in employment, health, and statutory matters. |
337 | |||
| 27 |
Mairie du Blanc-Mesnilblancmesnil.fr
Local government administration serving over 57,300 residents in Seine-Saint-Denis, providing municipal services and community information. |
318 | |||
| 28 |
Seine-Saint-Denis habitatseinesaintdenishabitat.fr
A leading social housing provider in Seine-Saint-Denis, managing over 33,000 rental units in 30 municipalities in the department |
306 | |||
| 29 |
GHT Grand Paris Nord-Estght-gpne.fr
Three hospitals in Seine-Saint-Denis providing specialized, teaching, and research healthcare services with over 6000 professionals ensuring coordinated, quality patient care. |
297 | |||
| 30 |
Centre Hospitalier de Saint-Denisch-stdenis.fr
Public hospital offering medical care without discrimination, with a focus on multicultural patient care Provides various medical specialties, including emergency services and perinatal care |
293 | |||
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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-Saint-Denis department
- The largest companies in the Seine-Saint-Denis department 1,293
- Multinational companies in the Seine-Saint-Denis department 198
- Companies with in-house R&D in the Seine-Saint-Denis department 102
- Retail chains in the Seine-Saint-Denis department 101
- Distributors and wholesalers in the Seine-Saint-Denis department 81
- IT services companies in the Seine-Saint-Denis department 79
- IT Services and IT Consulting companies in the Seine-Saint-Denis department 78
- Manufacturers in the Seine-Saint-Denis department 72
- Professional services firms in the Seine-Saint-Denis department 71
- Education providers in the Seine-Saint-Denis department 69
- Hardware manufacturers in the Seine-Saint-Denis department 58
- Critical infrastructure operators in the Seine-Saint-Denis department 53
- Government Administration companies in the Seine-Saint-Denis department 53
- Family-owned companies in the Seine-Saint-Denis department 50
- Consulting firms in the Seine-Saint-Denis department 44
- Companies with a mobile app in the Seine-Saint-Denis department 44
- Construction companies in the Seine-Saint-Denis department 44
- Logistics companies in the Seine-Saint-Denis department 40
- Professional Training and Coaching companies in the Seine-Saint-Denis department 39
- Advertising Services companies in the Seine-Saint-Denis department 37
- SaaS companies in the Seine-Saint-Denis department 37
- Civic and Social Organizations companies in the Seine-Saint-Denis department 36
- Environmental Services companies in the Seine-Saint-Denis department 36
- Software Development companies in the Seine-Saint-Denis department 35
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 Isère department 80
- Public sector organisations in the Loire-Atlantique department 80
- Public sector organisations in Paris 460
- Public sector organisations in Marseille 103
- Public sector organisations in Toulouse 83