# Top 30 Government Administration companies in the Seine-Saint-Denis department

Tamtam tracks 53 Government Administration companies headquartered in the Seine-Saint-Denis department. This list ranks the 30 largest by number of employees on LinkedIn, led by Conseil départemental de la Seine-Saint-Denis, ACOSS and Agence Régionale de Santé Ile-de-France. Their median headcount is 489. The most common headquarters are Montreuil (7), Saint-Denis (5) and Aubervilliers (3).

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.

🇫🇷 Seine-Saint-Denis · 30 companies · Updated Nov 13, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Conseil départemental de la Seine-Saint-Denis](https://www.tamtam.ai/c/conseil-departemental-de-la-seine-saint-denis) (seinesaintdenis.fr)<br>The company works to create opportunities for local economic development, ensuring that residents benefit from job initiatives and new actions | Government Administration | 🇫🇷 Bobigny | 3,255 |  |
| 2 | [ACOSS](https://www.tamtam.ai/c/acoss) (linkedin.com)<br>A national organization supports employers and entrepreneurs by advising, informing, and streamlining services, ensuring social protection financing, and promoting responsibility, solidarity, and equity | Government Administration | 🇫🇷 Montreuil | 3,000 |  |
| 3 | [Agence Régionale de Santé Ile-de-France](https://www.tamtam.ai/c/agence-regionale-de-sante-ile-de-france) (linktr.ee)<br>Implements regional health policy, covering prevention, care, and medico-social support, developed in consultation with professionals and users for efficiency and transparency. | Government Administration | 🇫🇷 Saint-Denis | 2,332 | 2010 |
| 4 | [Urssaf Caisse nationale](https://www.tamtam.ai/c/urssaf-caisse-nationale) (urssaf.org)<br>Collects contributions from employers, self-employed, and employees to fund social benefits like healthcare, hospitals, and public transport, supporting economic and social development. | Government Administration | 🇫🇷 Montreuil | 1,470 | 1960 |
| 5 | [Urssaf Ile-de-France](https://www.tamtam.ai/c/urssaf-ile-de-france) (lasecurecrute.fr)<br>Collection and redistribution of social security contributions ensuring workers' social protection and supporting entrepreneurs with compliance and service. | Government Administration | 🇫🇷 Montreuil | 1,142 |  |
| 6 | [Plaine Commune](https://www.tamtam.ai/c/plaine-commune) (plainecommune.fr)<br>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 | Government Administration | 🇫🇷 Saint-Denis | 1,017 | 2000 |
| 7 | [Ville de Montreuil](https://www.tamtam.ai/c/ville-de-montreuil) (montreuil.fr)<br>Local government providing public services and employment opportunities for residents in a densely populated urban area in Île-de-France. | Government Administration | 🇫🇷 Montreuil | 823 |  |
| 8 | [Académie de La Réunion](https://www.tamtam.ai/c/academie-de-la-reunion) (ac-reunion.fr)<br>Administrative district managing regional educational policies and coordination between national education ministry and local government authorities in La Réunion region. | Government Administration | 🇫🇷 Saint-Denis | 690 | 1984 |
| 9 | [Ville de Saint-Denis](https://www.tamtam.ai/c/ville-de-saint-denis) (ville-saint-denis.fr)<br>Local government providing public services, supporting daily life and personal projects for approximately 115,000 residents in Saint-Denis. | Government Administration | 🇫🇷 Saint-Denis | 666 |  |
| 10 | [FranceAgriMer](https://www.tamtam.ai/c/franceagrimer) (franceagrimer.fr)<br>A national establishment under the French Ministry for Agriculture, providing economic expertise, market monitoring, and strategic support for the agriculture and sea sectors | Government Administration | 🇫🇷 Montreuil | 636 | 2009 |
| 11 | [Mairie de Saint Denis](https://www.tamtam.ai/c/mairie-de-saint-denis) (saintdenis.re)<br>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 | Government Administration | 🇫🇷 Saint-Denis | 604 | 1669 |
| 12 | [Ville de Pantin](https://www.tamtam.ai/c/ville-de-pantin) (pantin.fr)<br>A dynamic and creative city near Paris, Pantin preserves its industrial heritage while attracting businesses, artisans, and cultural institutions, fostering excellence and solidarity | Government Administration | 🇫🇷 Pantin | 582 |  |
| 13 | [Cour nationale du droit d'asile (CNDA)](https://www.tamtam.ai/c/cour-nationale-du-droit-d-asile-cnda) (cnda.fr)<br>Specialized administrative court in France responsible for reviewing asylum decisions and appeals against the decisions of the French Office for Refugees and Stateless Persons | Government Administration | 🇫🇷 Montreuil | 549 |  |
| 14 | [UCANSS](https://www.tamtam.ai/c/ucanss) (ucanss.fr)<br>It is an employer federation for Social Security, managing social dialogue, offering HR, purchasing, and real estate services, and promoting innovation and efficiency for its clients. | Government Administration | 🇫🇷 Montreuil | 511 | 1970 |
| 15 | [Mairie d'Aubervilliers](https://www.tamtam.ai/c/mairie-d-aubervilliers) (aubervilliers.fr)<br>Local government managing public services and urban development for a dynamic city with over 92,000 residents and 1800 employees. | Government Administration | 🇫🇷 Aubervilliers | 489 | 2021 |
| 16 | [Ville de Noisy-le-Grand](https://www.tamtam.ai/c/ville-de-noisy-le-grand) (noisylegrand.fr)<br>Local government serving a population of 70,000 residents | Government Administration | 🇫🇷 Noisy-le-Grand | 471 |  |
| 17 | [Ville de Rosny-sous-bois](https://www.tamtam.ai/c/ville-de-rosny-sous-bois) (rosnysousbois.fr)<br>Local government managing urban development, transportation infrastructure, commercial centers, and international partnerships to support community growth and connectivity. | Government Administration | 🇫🇷 Rosny-sous-Bois | 391 |  |
| 18 | [DRIEETS d'Île-de-France](https://www.tamtam.ai/c/drieets-d-ile-de-france) (idf.drieets.gouv.fr)<br>Economic and social interlocutor supporting employment policies, labor inspection, market regulation, business development, social cohesion, and professional training. | Government Administration | 🇫🇷 Aubervilliers | 365 |  |
| 19 | [Mairie du Blanc-Mesnil](https://www.tamtam.ai/c/mairie-du-blanc-mesnil) (blancmesnil.fr)<br>Local government administration serving over 57,300 residents in Seine-Saint-Denis, providing municipal services and community information. | Government Administration | 🇫🇷 Le Blanc-Mesnil | 318 |  |
| 20 | [Mairie de La Courneuve](https://www.tamtam.ai/c/mairie-de-la-courneuve) (lacourneuve.fr)<br>Focus on urban development, social housing, and community projects, enhancing connectivity and quality of life for residents in La Courneuve. | Government Administration | 🇫🇷 La Courneuve | 289 | 1793 |
| 21 | [Mairie de Livry-Gargan](https://www.tamtam.ai/c/mairie-de-livry-gargan) (livry-gargan.fr)<br>Local government administration serving 44,721 residents in Seine-Saint-Denis, employing over 1,200 public service agents for community management. | Government Administration | 🇫🇷 Livry-Gargan | 265 |  |
| 22 | [Ville de Bobigny](https://www.tamtam.ai/c/ville-de-bobigny) (bobigny.fr)<br>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 | Government Administration | 🇫🇷 Bobigny | 261 |  |
| 23 | [Ined - Institut national d'études démographiques](https://www.tamtam.ai/c/ined-institut-national-d-etudes-demographiques) (ined.fr)<br>Research institute studying populations using multidisciplinary approaches, disseminating knowledge, and training researchers in France and internationally. | Government Administration | 🇫🇷 Aubervilliers | 256 | 1945 |
| 24 | [Ville de Noisy-le-Sec](https://www.tamtam.ai/c/ville-de-noisy-le-sec) (noisylesec.fr)<br>Provides cultural, sports, and leisure services with strategic transport access, managing public policies for 45,000 residents through 1200 staff. | Government Administration | 🇫🇷 Noisy-le-Sec | 244 |  |
| 25 | [Ville de Clichy-sous-Bois](https://www.tamtam.ai/c/ville-de-clichy-sous-bois) (clichy-sous-bois.fr)<br>Innovative and forward-looking community in Clichy-sous-Bois, focused on future urban development projects like the Grand Paris integration for modernity and inclusion | Government Administration | 🇫🇷 Clichy-sous-Bois | 234 |  |
| 26 | [Mairie de Drancy](https://www.tamtam.ai/c/mairie-de-drancy) (drancy.fr)<br>Manages a Parisian suburb, providing local services, fostering economic development with over 3,000 businesses, and promoting sustainable initiatives and equal opportunities. | Government Administration | 🇫🇷 Drancy | 208 |  |
| 27 | [Ville de Tremblay-en-France](https://www.tamtam.ai/c/ville-de-tremblay-en-france) (tremblay-en-france.fr)<br>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 | Government Administration | 🇫🇷 Tremblay-en-France | 203 |  |
| 28 | [Ville de Neuilly-sur-Marne](https://www.tamtam.ai/c/ville-de-neuilly-sur-marne) (neuillysurmarne.fr)<br>The company in Neuilly-sur-Marne focuses on creating a high quality living environment for its residents through public policies and community involvement | Government Administration | 🇫🇷 Neuilly-sur-Marne | 193 |  |
| 29 | [Épinay-sur-Seine](https://www.tamtam.ai/c/epinay-sur-seine) (epinay-sur-seine.fr)<br>City located near Paris with extensive public transport connections, serving over 55,000 residents across seven neighborhoods. | Government Administration | 🇫🇷 Épinay-sur-Seine | 189 | 1918 |
| 30 | [Caf de la Seine-Saint-Denis](https://www.tamtam.ai/c/caf-de-la-seine-saint-denis) (caf.fr)<br>The organization is a private entity managing public services, providing financial aid and social services to support families in need | Government Administration | 🇫🇷 Bobigny | 186 | 1991 |

## 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 13, 2026.

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- [SaaS companies in the Seine-Saint-Denis department](https://www.tamtam.ai/l/saas-companies-seine-saint-denis) (37)
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## The same list elsewhere in France

- [Government Administration companies in France](https://www.tamtam.ai/l/government-administration-companies-france) (1,862)
- [Government Administration companies in Île-de-France](https://www.tamtam.ai/l/government-administration-companies-ile-de-france) (496)
- [Government Administration companies in Auvergne-Rhône-Alpes](https://www.tamtam.ai/l/government-administration-companies-auvergne-rhone-alpes) (201)
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- [Government Administration companies in Nouvelle-Aquitaine](https://www.tamtam.ai/l/government-administration-companies-nouvelle-aquitaine) (145)
- [Government Administration companies in Occitanie](https://www.tamtam.ai/l/government-administration-companies-occitanie) (138)
- [Government Administration companies in Hauts-de-France](https://www.tamtam.ai/l/government-administration-companies-hauts-de-france) (126)
- [Government Administration companies in Pays de la Loire](https://www.tamtam.ai/l/government-administration-companies-pays-de-la-loire) (96)
- [Government Administration companies in Normandy](https://www.tamtam.ai/l/government-administration-companies-normandy) (93)
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- [Government Administration companies in the Hauts-de-Seine department](https://www.tamtam.ai/l/government-administration-companies-hauts-de-seine) (43)
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## The same list elsewhere

- [Government Administration companies in the world](https://www.tamtam.ai/l/government-administration-companies-in-the-world) (8,776)
- [Government Administration companies in Europe](https://www.tamtam.ai/l/government-administration-companies-in-europe) (4,201)

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Source: https://www.tamtam.ai/l/government-administration-companies-seine-saint-denis