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

Tamtam tracks 33 public sector organisations headquartered in the Charente-Maritime department. This list ranks the 30 largest by number of employees on LinkedIn, led by La Rochelle Université, Département de la Charente-Maritime and Groupe Hospitalier Littoral Atlantique. Their median headcount is 75. Half of them were founded in 1980 or later. The most common headquarters are La Rochelle (8), Saintes (7) and Périgny (3).

This list compiles public sector organizations in Charente-Maritime, primarily large public bodies. These entities encompass a broad range of services, from higher education to healthcare and local administration. Notable organizations include La Rochelle Université, providing higher education, and the Département de la Charente-Maritime, employing over 2500 agents in various public service roles. Groupe Hospitalier Littoral Atlantique offers diverse healthcare services, while SDIS 17 is the Fire and Rescue Department.

The organizations are mainly concentrated in key urban centers. La Rochelle serves as the headquarters for several entities, including Port Atlantique La Rochelle, the fifth-largest French maritime port, and La Rochelle Université. Saintes is another significant hub, hosting Groupe Hospitalier Saintes - Saint-Jean-d'Angély and Communauté d'Agglomération de Saintes. The data shows a strong presence of government administration and healthcare services across the region.

🇫🇷 Charente-Maritime · 30 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [La Rochelle Université](https://www.tamtam.ai/c/la-rochelle-universite) (univ-larochelle.fr)<br>Higher education institution offering personalized learning, active research involvement, and strong partnerships with businesses for innovation and development. | Higher Education | 🇫🇷 La Rochelle | 1,213 | 1993 |
| 2 | [Département de la Charente-Maritime](https://www.tamtam.ai/c/departement-de-la-charente-maritime) (la.charente-maritime.fr)<br>Employs over 2500 agents in diverse roles including medical, social work, engineering, administration, and management to serve public needs. | Government Administration | 🇫🇷 La Rochelle | 576 |  |
| 3 | [Groupe Hospitalier Littoral Atlantique](https://www.tamtam.ai/c/groupe-hospitalier-littoral-atlantique) (ch-larochelle.fr)<br>The Groupe Hospitalier Littoral-Atlantique is a multi-site hospital group with various specialties, providing a wide range of healthcare services | Hospitals and Health Care | 🇫🇷 La Rochelle | 452 |  |
| 4 | [SDIS 17](https://www.tamtam.ai/c/sdis-17) (sdis17.fr)<br>Official page of the Fire and Rescue Department in Charente-Maritime, providing emergency response and fire safety services to the community | Public Safety | 🇫🇷 Périgny | 377 |  |
| 5 | [Groupe Hospitalier Saintes - Saint-Jean-d'Angély](https://www.tamtam.ai/c/groupe-hospitalier-saintes-saint-jean-d-angely) (gh-saintesangely.fr)<br>A healthcare group in Nouvelle-Aquitaine, France with 1300 beds and 3000 employees, located in the heart of Charente-Maritime | Hospitals and Health Care | 🇫🇷 Saintes | 311 |  |
| 6 | [RESE](https://www.tamtam.ai/c/rese) (rese.fr)<br>The company produces drinking water, provides water distribution and sewage services to over 300,000 users for municipalities choosing public operation | Manufacturing | 🇫🇷 Saintes | 225 | 1954 |
| 7 | [Enim - Le régime social des marins](https://www.tamtam.ai/c/enim-le-regime-social-des-marins) (enim.eu)<br>An administrative public institution overseeing the social security regime for maritime workers, managing risks and providing healthcare and social services for mariners and employers | Government Administration | 🇫🇷 Périgny | 145 |  |
| 8 | [Université de La Rochelle](https://www.tamtam.ai/c/universite-de-la-rochelle) (univ-larochelle.fr)<br>Based in La Rochelle, Nouvelle-Aquitaine, France. This internet company operates from 23 Avenue Albert Einstein. | Technology, Information and Internet | 🇫🇷 La Rochelle | 120 |  |
| 9 | [Communauté d'Agglomération de Saintes](https://www.tamtam.ai/c/communaute-d-agglomeration-de-saintes) (agglo-saintes.fr)<br>A government administration company located in Saintes, France, serving the community and managing regional development projects in Nouvelle-Aquitaine | Government Administration | 🇫🇷 Saintes | 117 |  |
| 10 | [Port Atlantique La Rochelle](https://www.tamtam.ai/c/port-atlantique-la-rochelle) (port.fr)<br>Fifth largest French maritime port, responsible for developing sea transport, managing access infrastructure, and facilitating logistics for goods. Significant player in grain, pulp, and forest product trade. | Maritime Transportation | 🇫🇷 La Rochelle | 109 | 1890 |
| 11 | [CCI Charente-Maritime](https://www.tamtam.ai/c/cci-charente-maritime) (cci.fr)<br>Offers tailored support, guidance, and resources to entrepreneurs, small and medium businesses, artisans, and merchants for growth, innovation, and international development. | Government Administration | 🇫🇷 Rochefort | 105 | 2021 |
| 12 | [Rochefort Océan, le territoire](https://www.tamtam.ai/c/rochefort-ocean-le-territoire) (agglo-rochefortocean.fr)<br>Regional community fostering economic development, innovation, job creation, and sustainable growth across 25 municipalities with cultural heritage. | Government Administration | 🇫🇷 Rochefort | 99 | 2014 |
| 13 | [Ville de Saintes](https://www.tamtam.ai/c/ville-de-saintes) (ville-saintes.fr)<br>A city in France with 25,000 residents focused on economic development, environmental sustainability, and offering job opportunities in various fields | Government Administration | 🇫🇷 Saintes | 94 |  |
| 14 | [Communauté d'agglomération Royan Atlantique](https://www.tamtam.ai/c/communaute-d-agglomeration-royan-atlantique) (agglo-royan.fr)<br>Management of water, waste, transport, economic development, urban planning, housing balance, and community social policies across 33 municipalities. | Government Administration | 🇫🇷 Royan | 93 | 2001 |
| 15 | [Communauté de communes de l'île de Ré](https://www.tamtam.ai/c/communaute-de-communes-de-l-ile-de-re) (cdciledere.fr)<br>Management of urban planning, economic development, environment, housing, culture, sports, social services, tourism, and infrastructure across ten island communes. | Government Administration | 🇫🇷 Saint-Martin-de-Ré | 75 | 1993 |
| 16 | [Office Public de l'Habitat de l'agglomération de La Rochelle](https://www.tamtam.ai/c/office-public-de-l-habitat-de-l-agglomeration-de-la-rochelle) (office-agglo-larochelle.fr)<br>The company is a leading social housing provider in La Rochelle offering construction, improvement, management, and support services to residents for quality housing solutions | Real Estate | 🇫🇷 La Rochelle | 70 | 1891 |
| 17 | [Yélo - RTCR](https://www.tamtam.ai/c/yelo-rtcr) (rtcr.fr)<br>A public transport company in La Rochelle managing bus lines, bike services, park-and-ride facilities, and marketing for Yélo brand | Urban Transit Services | 🇫🇷 Lagord | 67 |  |
| 18 | [Communauté des Communes de la Haute Saintonge](https://www.tamtam.ai/c/communaute-des-communes-de-la-haute-saintonge) (haute-saintonge.org)<br>A French intermunicipal community in Charente-Maritime, Nouvelle-Aquitaine, promoting economic and tourism development in a territory of 129 municipalities since 1993 | Government Administration | 🇫🇷 Jonzac | 67 | 1993 |
| 19 | [Lycée Merleau Ponty](https://www.tamtam.ai/c/lycee-merleau-ponty) (lycee-merleauponty.fr)<br>A high school in Rochefort offering general and technological education, as well as post-bac programs in Communication and Computer Systems | Education | 🇫🇷 Rochefort | 59 | 1965 |
| 20 | [UNIMA](https://www.tamtam.ai/c/unima-perigny) (unima.fr)<br>Manages and maintains rivers and marshes, prevents floods, and handles surface hydraulics across over 70% of the Charente-Maritime department. | Environmental Services | 🇫🇷 Périgny | 58 | 1954 |
| 21 | [Soluris](https://www.tamtam.ai/c/soluris) (soluris.fr)<br>Support and guide 580 public institutions in Nouvelle Aquitaine through digital transformation as a public digital services operator. | IT Services and IT Consulting | 🇫🇷 Saintes | 50 | 1985 |
| 22 | [Les Antilles de Jonzac](https://www.tamtam.ai/c/les-antilles-de-jonzac) (lesantillesdejonzac.com)<br>A public water park created through a collaboration of government entities, built in 2001 with a budget of 20 million euros Inaugurated in 2002 | Wellness and Fitness Services | 🇫🇷 Jonzac | 50 | 2022 |
| 23 | [CAMPUS DE L'ALIMENTATION ENILIA ENSMIC](https://www.tamtam.ai/c/campus-de-l-alimentation-enilia-ensmic) (campus-alimentation.fr)<br>ENILIA-ENSMIC offers 200 years of experience in training and research in the food industry, providing specialized programs, technical equipment, and research facilities | Food and Beverage Manufacturing | 🇫🇷 Surgères | 48 |  |
| 24 | [Assurance Maladie de la Charente-Maritime](https://www.tamtam.ai/c/assurance-maladie-de-la-charente-maritime) (ameli.fr)<br>Working at this health insurance company means protecting the health of over 68 million insured individuals, ensuring access to healthcare and improving the system | Government Administration | 🇫🇷 La Rochelle | 47 | 1975 |
| 25 | [Eau 17](https://www.tamtam.ai/c/eau-17) (eau17.fr)<br>Public organization managing water supply and sanitation services for 450,000 residents across 432 communes with sustainable resource preservation. | Government Administration | 🇫🇷 Saintes | 46 | 1952 |
| 26 | [CENTRE HOSPITALIER ROYAN-ATLANTIQUE](https://www.tamtam.ai/c/centre-hospitalier-royan-atlantique) (linktr.ee)<br>Public healthcare institution with 318 beds, offering short-term care, rehabilitation, elderly housing, and long-term care services across two locations. | Hospitals and Health Care | 🇫🇷 Vaux-sur-Mer | 45 | 1945 |
| 27 | [La Rochelle Tourisme et Evénements](https://www.tamtam.ai/c/la-rochelle-tourisme-et-evenements) (nous-larochelle.fr)<br>Managing convention centers and tourism offices to promote regional travel, business conventions, and large events while providing specialized local expertise and engagement. | Events Services | 🇫🇷 La Rochelle | 41 | 1989 |
| 28 | [Syndicat Mixte Cyclad](https://www.tamtam.ai/c/syndicat-mixte-cyclad) (cyclad.org)<br>Public service for waste collection, processing, and valorization for over 233,481 residents in Charente-Maritime Leading initiatives on waste reduction and circular economy innovation | Waste Treatment and Disposal | 🇫🇷 Surgères | 34 | 1980 |
| 29 | [Habitat 17](https://www.tamtam.ai/c/habitat-17) (habitat17.fr)<br>Public organization managing and maintaining over 4700 social rental housing units, partnering with municipalities for technical and financial project support. | Real Estate | 🇫🇷 La Rochelle | 33 | 1950 |
| 30 | [Société d'Economie Mixte Immobilière de la Saintonge (S.E.M.I.S)](https://www.tamtam.ai/c/societe-d-economie-mixte-immobiliere-de-la-saintonge-s-e-m-i-s) (semis17.com)<br>The company manages a real estate portfolio across over 80 municipalities in Charente Maritime, becoming a major social landlord in the Saintes agglomeration | Real Estate | 🇫🇷 Saintes | 25 | 1922 |

## 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 11, 2026.

## More company lists in the Charente-Maritime department

- [The largest companies in the Charente-Maritime department](https://www.tamtam.ai/l/largest-companies-charente-maritime) (444)
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- [Multinational companies in the Charente-Maritime department](https://www.tamtam.ai/l/multinational-companies-charente-maritime) (36)
- [Professional services firms in the Charente-Maritime department](https://www.tamtam.ai/l/professional-services-firms-charente-maritime) (26)

## 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)
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- [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) (187)
- [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)
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- [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 Loire-Atlantique department](https://www.tamtam.ai/l/public-sector-organisations-loire-atlantique) (82)
- [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)
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Source: https://www.tamtam.ai/l/public-sector-organisations-charente-maritime