# Government Administration companies headquartered in the Yvelines department Tamtam tracks 51 Government Administration companies headquartered in the Yvelines department. This list ranks the 30 largest by number of employees on LinkedIn, led by Département des Yvelines, SDIS 78 and Ville de Versailles. Their median headcount is 196. The most common headquarters are Versailles (10) and Plaisir (2). The government administration entities in Yvelines are primarily local government bodies and public service providers. These include large departmental organizations like Département des Yvelines, which provides social support and education, and SDIS 78, managing fire and rescue services. Other significant entities are Ville de Versailles, offering local services in the historic city, and Pôle Emploi, a public employment service. The majority of these organizations are based in Versailles, indicating a strong concentration of administrative functions in the departmental capital. Many are well-established, with several founded in the mid-20th century, such as Crous de Versailles (1955) and Département des Yvelines (1964). They cover a broad spectrum of public services, from healthcare with CPAM des Yvelines to urban planning and community well-being with various city councils. 🇫🇷 Yvelines · 30 companies · Updated Nov 12, 2026 | # | Company | Industry | Headquarters | Employees | Founded | |---|---|---|---|---|---| | 1 | [Département des Yvelines](https://www.tamtam.ai/c/departement-des-yvelines) (yvelines.fr)
Local government providing social support, education, mobility, and territorial development services to improve daily life for residents. | Government Administration | 🇫🇷 Versailles | 4,000 | 1964 | | 2 | [SDIS 78](https://www.tamtam.ai/c/sdis-78) (sdis78.fr)
Public establishment managing fire and rescue services in Yvelines, under mayors and prefects. Responsible for operations, personnel, and equipment. | Government Administration | 🇫🇷 Versailles | 1,061 | 1996 | | 3 | [Ville de Versailles](https://www.tamtam.ai/c/ville-de-versailles) (versailles.fr)
A historic city known for its palace and gardens, offering a vibrant local economy, employment opportunities in various fields, and a high quality of life | Government Administration | 🇫🇷 Versailles | 757 | | | 4 | [Pôle Emploi](https://www.tamtam.ai/c/pole-emploi) (pole-emploi.fr)
Distributor of IKON, a platform helping companies improve IT service performance and business activities through unified real-time monitoring and data management. | Government Administration | 🇫🇷 Plaisir | 511 | | | 5 | [CPAM des Yvelines](https://www.tamtam.ai/c/cpam-des-yvelines) (ameli.fr)
A private organization serving the CNAM for public service, protecting over 15 million individuals by implementing healthcare policies locally in Yvelines | Government Administration | 🇫🇷 Versailles | 480 | 1981 | | 6 | [Grand Paris Seine & Oise](https://www.tamtam.ai/c/grand-paris-seine-and-oise) (gpseo.fr)
management of a large urban and rural territory focusing on economic sectors, innovation, infrastructure, environment, and public services organization | Government Administration | 🇫🇷 Aubergenville | 429 | 2016 | | 7 | [Ville de Mantes-la-Jolie](https://www.tamtam.ai/c/ville-de-mantes-la-jolie) (manteslajolie.fr)
City near a natural park balancing historic center, residential areas, economic development, urban planning, and upcoming RER line connection. | Government Administration | 🇫🇷 Mantes-la-Jolie | 420 | | | 8 | [Crous de Versailles](https://www.tamtam.ai/c/crous-de-versailles) (crous-versailles.fr)
State operator in charge of all student life aspects, serving 206,000 students in the Versailles academic region through 700 agents | Government Administration | 🇫🇷 Versailles | 344 | 1955 | | 9 | [Mairie des Mureaux](https://www.tamtam.ai/c/mairie-des-mureaux) (lesmureaux.fr)
Provides administrative and local government services to residents and businesses in the Mureaux community within Yvelines, Île-de-France region. | Government Administration | 🇫🇷 Les Mureaux | 342 | | | 10 | [Mairie de Conflans Sainte Honorine](https://www.tamtam.ai/c/mairie-de-conflans-sainte-honorine) (conflans-sainte-honorine.fr)
Local government entity managing administrative, social, and urban development services within Île de France, Yvelines department, and Grand Paris Seine & Oise community. | Government Administration | 🇫🇷 Conflans-Sainte-Honorine | 272 | | | 11 | [Mairie de Velizy](https://www.tamtam.ai/c/mairie-de-velizy) (velizy-villacoublay.fr)
Manage residential neighborhoods, economic activity centers, commercial hubs, and green spaces to maintain an attractive living environment near Paris. | Government Administration | 🇫🇷 Velizy-Villacoublay | 264 | | | 12 | [Ville de Saint-Germain-en-Laye](https://www.tamtam.ai/c/ville-de-saint-germain-en-laye) (saintgermainenlaye.fr)
Local government managing urban development, cultural heritage, public services, infrastructure projects, and community well-being with a focus on sustainability and employment. | Government Administration | 🇫🇷 Saint-Germain-en-Laye | 252 | | | 13 | [Ville de Chatou](https://www.tamtam.ai/c/ville-de-chatou) (chatou.fr)
Local government focused on cultural heritage, digital transformation, eco-responsible administration, public service quality, and innovative human resources policies. | Government Administration | 🇫🇷 Chatou | 223 | | | 14 | [Ville de Montigny-le-Bretonneux](https://www.tamtam.ai/c/ville-de-montigny-le-bretonneux) (montigny78.fr)
Manages a French commune near Paris, focusing on environment, sports, and culture, housing major companies and Olympic venues, serving its residents. | Government Administration | 🇫🇷 Montigny-le-Bretonneux | 206 | | | 15 | [Caf des Yvelines](https://www.tamtam.ai/c/caf-des-yvelines) (caf.fr)
The company is a private organization providing public services in the Yvelines department, handling social benefits, family support, and migrant worker affairs | Government Administration | 🇫🇷 Versailles | 196 | | | 16 | [Ville de Trappes](https://www.tamtam.ai/c/ville-de-trappes) (trappes.fr)
A city undergoing urban renewal with diverse housing, economic growth, quality public services, and a young, talented population determined to succeed | Government Administration | 🇫🇷 Trappes | 181 | | | 17 | [Préfecture des Yvelines](https://www.tamtam.ai/c/prefecture-des-yvelines) (yvelines.gouv.fr)
Official page of the Prefect and State services in Yvelines, providing information and updates on government activities and services | Government Administration | 🇫🇷 Versailles | 159 | 1968 | | 18 | [Ville de Poissy](https://www.tamtam.ai/c/ville-de-poissy) (ville-poissy.fr)
Manages a French city with a rich history, known for agriculture, trade, religious significance, and a strategic river crossing from antiquity to the present. | Government Administration | 🇫🇷 Poissy | 156 | | | 19 | [Ville de Houilles](https://www.tamtam.ai/c/ville-de-houilles) (ville-houilles.fr)
The company is located in Houilles, a friendly city near Paris, focusing on urban development with a strong emphasis on quality of life and community engagement | Government Administration | 🇫🇷 Houilles | 154 | | | 20 | [Versailles Grand Parc](https://www.tamtam.ai/c/versailles-grand-parc) (versaillesgrandparc.fr)
Versailles Grand Parc supports entrepreneurs and project leaders in urban ecology and innovative mobility, aiming to modernize and enhance their exceptional living environment | Government Administration | 🇫🇷 Versailles | 135 | 2003 | | 21 | [24e régiment d'infanterie](https://www.tamtam.ai/c/24e-regiment-d-infanterie) (facebook.com)
A French infantry regiment, mainly composed of reserve military personnel, engaging in domestic security missions and deployment overseas, with a focus on recruitment | Government Administration | 🇫🇷 Versailles | 122 | 1775 | | 22 | [DDT 78](https://www.tamtam.ai/c/ddt-78) (yvelines.gouv.fr)
Government agency responsible for regional planning and development in the department 78, implementing policies related to land use and environmental management | Government Administration | 🇫🇷 Versailles | 115 | | | 23 | [Ville de Maisons-Laffitte](https://www.tamtam.ai/c/ville-de-maisons-laffitte) (maisonslaffitte.fr)
Official online platform providing residents and visitors with information about local administration, services, events, and community resources. | Government Administration | 🇫🇷 Maisons-Laffitte | 112 | | | 24 | [Ville de Marly-le-Roi](https://www.tamtam.ai/c/ville-de-marly-le-roi) (marlyleroi.fr)
A vibrant town in Yvelines, near Paris, attracting businesses and residents with quality public services, a green setting, and diverse economic opportunities Join us! | Government Administration | 🇫🇷 Marly-le-Roi | 110 | | | 25 | [Mairie du Vésinet](https://www.tamtam.ai/c/mairie-du-vesinet) (villeduvesinet.fr)
municipal administration managing historic heritage, green spaces, and community projects to enhance quality of life and sustainability for residents | Government Administration | 🇫🇷 Le Vésinet | 104 | 1875 | | 26 | [Ville de Carrières-sous-Poissy](https://www.tamtam.ai/c/ville-de-carrieres-sous-poissy) (carrieres-sous-poissy.fr)
Official online presence providing information and updates about the city, its services, and community activities for residents and visitors. | Government Administration | 🇫🇷 Carrières-sous-Poissy | 101 | 1993 | | 27 | [Ville de Jouy-en-Josas](https://www.tamtam.ai/c/ville-de-jouy-en-josas) (jouy-en-josas.fr)
The company is a municipality located in Jouy-en-Josas, Yvelines, focusing on providing a high quality of life for its residents while promoting ecological and energy transition | Government Administration | 🇫🇷 Jouy-en-Josas | 97 | 1790 | | 28 | [Ville de Plaisir](https://www.tamtam.ai/c/ville-de-plaisir) (ville-plaisir.fr)
Provides residential living with cultural, sports, and commercial facilities in a dynamic economic environment near Paris, supporting community development. | Government Administration | 🇫🇷 Plaisir | 92 | | | 29 | [Mairie des Clayes-sous-Bois](https://www.tamtam.ai/c/mairie-des-clayes-sous-bois) (lesclayessousbois.fr)
A town in a UNESCO World Heritage site, Les Clayes-sous-Bois offers a pleasant living environment with a strong economic activity and vibrant community life | Government Administration | 🇫🇷 Les Clayes-sous-Bois | 85 | | | 30 | [CASGBS - Communauté d'agglomération Saint Germain Boucles de Seine](https://www.tamtam.ai/c/casgbs-communaute-d-agglomeration-saint-germain-boucles-de-seine) (saintgermainbouclesdeseine.fr)
Join a dynamic intercommunal organization near Paris, dedicated to innovation in active mobility, environment, economic development, and more for the benefit of its diverse population | Government Administration | 🇫🇷 Le Pecq | 78 | 2016 | ## 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 Yvelines department - [The largest companies in the Yvelines department](https://www.tamtam.ai/l/largest-companies-yvelines) (1,469) - [Multinational companies in the Yvelines department](https://www.tamtam.ai/l/multinational-companies-yvelines) (226) - [Companies with in-house R&D in the Yvelines department](https://www.tamtam.ai/l/r-and-d-companies-yvelines) (160) - [IT services companies in the Yvelines department](https://www.tamtam.ai/l/it-services-companies-yvelines) (121) - [IT Services and IT Consulting companies in the Yvelines department](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-yvelines) (118) - [Manufacturers in the Yvelines department](https://www.tamtam.ai/l/manufacturers-yvelines) (109) - [Professional services firms in the Yvelines department](https://www.tamtam.ai/l/professional-services-firms-yvelines) (108) - [Hardware manufacturers in the Yvelines department](https://www.tamtam.ai/l/hardware-companies-yvelines) (106) - [Distributors and wholesalers in the Yvelines department](https://www.tamtam.ai/l/distributors-and-wholesalers-yvelines) (91) - [Retail chains in the Yvelines department](https://www.tamtam.ai/l/retail-chains-yvelines) (89) - [Consulting firms in the Yvelines department](https://www.tamtam.ai/l/consulting-firms-yvelines) (72) - [Aerospace and defence companies in the Yvelines department](https://www.tamtam.ai/l/aerospace-and-defense-companies-yvelines) (65) - [Public sector organisations in the Yvelines department](https://www.tamtam.ai/l/public-sector-organisations-yvelines) (65) - [Software Development companies in the Yvelines department](https://www.tamtam.ai/l/software-development-companies-yvelines) (56) - [Business Consulting and Services companies in the Yvelines department](https://www.tamtam.ai/l/business-consulting-and-services-companies-yvelines) (53) - [Construction companies in the Yvelines department](https://www.tamtam.ai/l/construction-companies-yvelines) (50) - [Automotive manufacturers and suppliers in the Yvelines department](https://www.tamtam.ai/l/automotive-companies-yvelines) (49) - [Motor Vehicle Manufacturing companies in the Yvelines department](https://www.tamtam.ai/l/motor-vehicle-manufacturing-companies-yvelines) (49) - [SaaS companies in the Yvelines department](https://www.tamtam.ai/l/saas-companies-yvelines) (49) - [Education providers in the Yvelines department](https://www.tamtam.ai/l/education-companies-yvelines) (46) - [Industrial Machinery Manufacturing companies in the Yvelines department](https://www.tamtam.ai/l/industrial-machinery-manufacturing-companies-yvelines) (43) - [Critical infrastructure operators in the Yvelines department](https://www.tamtam.ai/l/critical-infrastructure-operators-yvelines) (41) - [Family-owned companies in the Yvelines department](https://www.tamtam.ai/l/family-owned-companies-yvelines) (36) - [Environmental services companies in the Yvelines department](https://www.tamtam.ai/l/environmental-services-companies-yvelines) (35) ## 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) - [Government Administration companies in Grand Est](https://www.tamtam.ai/l/government-administration-companies-grand-est) (168) - [Government Administration companies in Provence-Alpes-Côte d'Azur](https://www.tamtam.ai/l/government-administration-companies-provence-alpes-cote-dazur) (150) - [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) - [Government Administration companies in Brittany](https://www.tamtam.ai/l/government-administration-companies-brittany) (81) - [Government Administration companies in Bourgogne-Franche-Comté](https://www.tamtam.ai/l/government-administration-companies-bourgogne-franche-comte) (69) - [Government Administration companies in Centre-Val de Loire](https://www.tamtam.ai/l/government-administration-companies-centre-val-de-loire) (64) - [Government Administration companies in the Nord department](https://www.tamtam.ai/l/government-administration-companies-nord) (58) - [Government Administration companies in the Bouches-du-Rhône department](https://www.tamtam.ai/l/government-administration-companies-bouches-du-rhone) (57) - [Government Administration companies in the Seine-Saint-Denis department](https://www.tamtam.ai/l/government-administration-companies-seine-saint-denis) (53) - [Government Administration companies in the Rhône department](https://www.tamtam.ai/l/government-administration-companies-rhone) (51) - [Government Administration companies in the Gironde department](https://www.tamtam.ai/l/government-administration-companies-gironde) (46) - [Government Administration companies in the Val-de-Marne department](https://www.tamtam.ai/l/government-administration-companies-val-de-marne) (45) - [Government Administration companies in the Hauts-de-Seine department](https://www.tamtam.ai/l/government-administration-companies-hauts-de-seine) (43) - [Government Administration companies in the Haute-Garonne department](https://www.tamtam.ai/l/government-administration-companies-haute-garonne) (42) - [Government Administration companies in the Seine-et-Marne department](https://www.tamtam.ai/l/government-administration-companies-seine-et-marne) (39) - [Government Administration companies in the Loire-Atlantique department](https://www.tamtam.ai/l/government-administration-companies-loire-atlantique) (35) - [Government Administration companies in Paris](https://www.tamtam.ai/l/government-administration-companies-paris) (176) ## 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) --- Source: https://www.tamtam.ai/l/government-administration-companies-yvelines