These companies in Seine-Saint-Denis are predominantly large government administration entities, focusing on public services, social protection, and regional development. They include organizations like the Conseil départemental de la Seine-Saint-Denis, which supports local economic development, and ACOSS, a national body streamlining services for employers. Other notable entities are Agence Régionale de Santé Ile-de-France, implementing regional health policy, and Urssaf Caisse nationale, which collects contributions for social benefits. These organizations are generally well-established, with several founded decades ago.
A significant pattern observed is the concentration of headquarters in Montreuil and Saint-Denis, indicating these cities serve as key administrative hubs within the department. The companies collectively manage a wide array of public responsibilities, from social security collection and redistribution by Urssaf Ile-de-France to local government services provided by Ville de Montreuil and Ville de Saint-Denis. The presence of entities like FranceAgriMer highlights specialized governmental support for specific sectors.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
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 | |||
| 2 |
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 | |||
| 3 |
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 | |||
| 4 |
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 | |||
| 5 |
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 | |||
| 6 |
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 | |||
| 7 |
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 | |||
| 8 |
Académie de La Réunionac-reunion.fr
Administrative district managing regional educational policies and coordination between national education ministry and local government authorities in La Réunion region. |
690 | |||
| 9 |
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 | |||
| 10 |
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 | |||
| 11 |
Mairie de Saint Denissaintdenis.re
Established in 1669, this company became the capital of the island in 1738 with a population of 2,166 Today, it is the largest city overseas with nearly 150,000 residents spread across over 140 km², ranging from 0 to 2276 meters in altitude |
604 | |||
| 12 |
Ville de Pantinpantin.fr
A dynamic and creative city near Paris, Pantin preserves its industrial heritage while attracting businesses, artisans, and cultural institutions, fostering excellence and solidarity |
582 | |||
| 13 |
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 | |||
| 14 | 511 | ||||
| 15 |
Mairie d'Aubervilliersaubervilliers.fr
Local government managing public services and urban development for a dynamic city with over 92,000 residents and 1800 employees. |
489 | |||
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 | 471 | ||||
| 17 |
Ville de Rosny-sous-boisrosnysousbois.fr
Local government managing urban development, transportation infrastructure, commercial centers, and international partnerships to support community growth and connectivity. |
391 | |||
| 18 |
DRIEETS d'Île-de-Franceidf.drieets.gouv.fr
Economic and social interlocutor supporting employment policies, labor inspection, market regulation, business development, social cohesion, and professional training. |
365 | |||
| 19 |
Mairie du Blanc-Mesnilblancmesnil.fr
Local government administration serving over 57,300 residents in Seine-Saint-Denis, providing municipal services and community information. |
318 | |||
| 20 |
Mairie de La Courneuvelacourneuve.fr
Focus on urban development, social housing, and community projects, enhancing connectivity and quality of life for residents in La Courneuve. |
289 | |||
| 21 |
Mairie de Livry-Garganlivry-gargan.fr
Local government administration serving 44,721 residents in Seine-Saint-Denis, employing over 1,200 public service agents for community management. |
265 | |||
| 22 |
Ville de Bobignybobigny.fr
A municipality in the Seine-Saint-Denis department, Bobigny showcases its historical, architectural, and artistic heritage, undergoing urban renewal and integration in the Grand Paris metropolitan area |
261 | |||
| 23 |
Ined - Institut national d'études démographiquesined.fr
Research institute studying populations using multidisciplinary approaches, disseminating knowledge, and training researchers in France and internationally. |
256 | |||
| 24 |
Ville de Noisy-le-Secnoisylesec.fr
Provides cultural, sports, and leisure services with strategic transport access, managing public policies for 45,000 residents through 1200 staff. |
244 | |||
| 25 |
Ville de Clichy-sous-Boisclichy-sous-bois.fr
Innovative and forward-looking community in Clichy-sous-Bois, focused on future urban development projects like the Grand Paris integration for modernity and inclusion |
234 | |||
| 26 |
Mairie de Drancydrancy.fr
Manages a Parisian suburb, providing local services, fostering economic development with over 3,000 businesses, and promoting sustainable initiatives and equal opportunities. |
208 | |||
| 27 |
Ville de Tremblay-en-Francetremblay-en-france.fr
A city with 35,000 residents, upgraded to a higher stratum due to development projects around Roissy Charles-deGaulle Airport in the Grand Paris metropolitan area |
203 | |||
| 28 |
Ville de Neuilly-sur-Marneneuillysurmarne.fr
The company in Neuilly-sur-Marne focuses on creating a high quality living environment for its residents through public policies and community involvement |
193 | |||
| 29 |
Épinay-sur-Seineepinay-sur-seine.fr
City located near Paris with extensive public transport connections, serving over 55,000 residents across seven neighborhoods. |
189 | |||
| 30 |
Caf de la Seine-Saint-Deniscaf.fr
The organization is a private entity managing public services, providing financial aid and social services to support families in need |
186 | |||
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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 13, 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
- Public sector organisations in the Seine-Saint-Denis department 91
- 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
- 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
- Government Administration companies in France 1,862
- Government Administration companies in Île-de-France 496
- Government Administration companies in Auvergne-Rhône-Alpes 201
- Government Administration companies in Grand Est 168
- Government Administration companies in Provence-Alpes-Côte d'Azur 150
- Government Administration companies in Nouvelle-Aquitaine 145
- Government Administration companies in Occitanie 138
- Government Administration companies in Hauts-de-France 126
- Government Administration companies in Pays de la Loire 96
- Government Administration companies in Normandy 93
- Government Administration companies in Brittany 81
- Government Administration companies in Bourgogne-Franche-Comté 69
- Government Administration companies in Centre-Val de Loire 64
- Government Administration companies in the Nord department 58
- Government Administration companies in the Bouches-du-Rhône department 57
- Government Administration companies in the Rhône department 51
- Government Administration companies in the Yvelines department 51
- Government Administration companies in the Gironde department 46
- Government Administration companies in the Val-de-Marne department 45
- Government Administration companies in the Hauts-de-Seine department 43
- Government Administration companies in the Haute-Garonne department 42
- Government Administration companies in the Seine-et-Marne department 39
- Government Administration companies in the Loire-Atlantique department 35
- Government Administration companies in Paris 176