| # | Company | Employees |
|---|---|---|
| 1 |
City of Torontotoronto.ca
Provides diverse public services to residents, businesses, and visitors, encompassing technology, finance, culture, and innovation, employing a large workforce across numerous divisions. |
23,495 |
| 2 |
City of Ottawa / Ville d’Ottawajobs-emplois.ottawa.ca
A diverse workforce providing essential programs and services for over one million residents in Ottawa, with a focus on customer service and community well-being |
9,194 |
| 3 |
Health Canada | Santé Canadahealth.canada.ca
A Federal department in Canada focused on improving health for individuals through recruitment of professionals in various fields and student programs |
8,686 |
| 4 |
Global Affairs Canada | Affaires mondiales Canadainternational.gc.ca
Manage diplomatic and consular relations, promote international trade, lead international development and humanitarian assistance efforts for Canada. |
7,379 |
| 5 |
Agriculture and Agri-Food Canada/ Agriculture et Agroalimentaire Canadaagriculture.canada.ca
Agriculture and agri-food company supporting farmers and food producers in growth and development Terms of use: http://owly/gnCW50FjUsI / http://owly/XHSU50FjUvL |
6,405 |
| 6 |
Statistics Canada | Statistique Canadastatcan.gc.ca
A leading statistical agency providing relevant, accurate, and timely data to help Canadians better understand their country through an app and podcast series |
5,917 |
| 7 |
Fisheries and Oceans Canada / Pêches et Océans Canadadfo-mpo.gc.ca
Manage fisheries and aquaculture sustainably, protect aquatic ecosystems, maintain navigable waterways, and respond to maritime emergencies with Indigenous collaboration. |
5,665 |
| 8 |
Transport Canada - Transports Canadatc.canada.ca
A department with 5000 employees nationwide seeks individuals to contribute to meaningful work, growth opportunities, attractive benefits, and inclusive work environment |
5,540 |
| 9 |
Shared Services Canada | Services partagés Canadacanada.ca
Modernizing Government of Canada's IT infrastructure by delivering email, data centre, telecommunication, videoconferencing, and Wi-Fi services to customers |
5,161 |
| 10 |
Region of Peelpeelregion.ca
A diverse and inclusive organization in Peel Region delivering social services and infrastructure for residents and businesses, fostering a Community for Life |
4,959 |
| 11 |
City Of Hamiltonhamilton.ca
The organization aims to provide high-quality public services for a healthy, safe, and prosperous community while fostering collective ownership and diversity |
4,633 |
| 12 |
Natural Resources Canada (NRCan)natural-resources.canada.ca
A department of the Government of Canada focused on advancing sustainable resource management, economic growth, and environmental stewardship through innovative policies and programs |
4,579 |
| 13 |
City of Mississaugamississauga.ca
Dedicated team collaborating to improve quality of life, influence community growth, and deliver valuable services to residents and businesses. |
4,577 |
| 14 |
Canada Border Services Agency | Agence des services frontaliers du Canadacbsa-asfc.gc.ca
Ensures national security and economic prosperity by managing and monitoring international travel and trade at Canada's borders. |
4,369 |
| 15 |
City of Bramptonbrampton.ca
City with diverse cultures and innovative spirit focusing on technology, environmental innovation, and community-driven progress for residents and businesses. |
4,240 |
| 16 |
Canadian Food Inspection Agencyinspection.canada.ca
A federal regulator in Canada focused on enhancing food safety, animal health, and protecting plant resources with a commitment to employee growth and impact |
4,024 |
| 17 |
Department of Justice Canada | Ministère de la Justice Canadajustice.gc.ca
The Department of Justice Canada ensures a fair, accessible, and efficient justice system, led by the Minister of Justice and Attorney General |
3,940 |
| 18 |
Innovation, Science and Economic Development Canadaic.gc.ca
The company helps small and medium-sized businesses grow, supports science, promotes tourism, and offers diverse career opportunities with a focus on professional development |
3,817 |
| 19 |
York Region (The Regional Municipality of York)york.ca
The company provides services to 12 million residents, 54,000 businesses, and 650,000 employees in a two-tier government structure |
3,799 |
| 20 |
Education | Éducationontario.ca
The organization oversees Ontario's education and child care systems, helping children develop skills for lifelong success and contributing to a prosperous province |
3,771 |
| 21 |
Health | Santéontario.ca
Focused on protecting and strengthening publicly funded health care in Ontario by providing patient-focused, sustainable, and high-quality care for all residents |
3,762 |
| 22 |
Canadian Coast Guard/Garde côtière canadiennecanada.ca
A federal agency that operates a civilian fleet and provides maritime services to Canadians, ensuring safe waters, environmental protection, and economic growth |
2,892 |
| 23 |
Canada Mortgage and Housing Corporation (CMHC) Société canadienne d'hypothèques et de logement(SCHL)cmhc-schl.gc.ca
Provide housing financing solutions, implement government housing programs, and share research and data to support the housing sector. |
2,887 |
| 24 |
Durham Region (The Regional Municipality of Durham)durham.ca
Durham Region provides a wide range of services to a group of diverse communities, including paramedics, recycling, water supply, transit, and social programs |
2,624 |
| 25 |
Public & Business Services & Procurement | Services au public et aux entreprises & Approvisionnementontario.ca
Providing essential identity documents, consumer protection, and public safety services while managing provincial records and promoting a fair marketplace and workplace diversity. |
2,360 |
| 26 |
Solicitor General | Solliciteur généralontario.ca
The company is responsible for managing adult correctional institutions, probation and parole offices, policing, forensic sciences, fire safety, emergency management, animal welfare, and security services in Ontario |
2,315 |
| 27 |
Region of Waterlooregionofwaterloo.ca
Provides municipal services including transit, waste management, health, housing, and employs over 3,500 people in diverse roles. |
2,165 |
| 28 |
Ontario Public Service Leadership | Leadership dans la fonction publique de l’Ontarioontario.ca
The organization is a high-performing, innovative employer impacting the lives of millions through career opportunities in Ontario's public service |
2,105 |
| 29 |
Niagara Regionniagararegion.ca
Providing essential municipal services including water, roads, waste collection, public safety, and housing to support a diverse community. |
2,038 |
| 30 |
Halton Regionhalton.ca
Providing high-quality programs and services supporting safe, healthy communities and economic growth across multiple municipalities in Halton Region. |
1,992 |
| 31 |
City of Vaughanvaughan.ca
A forward-looking municipality in Vaughan, Canada, focused on city-building initiatives, environmental protection, economic prosperity, and fostering an inclusive community for its residents |
1,855 |
| 32 |
City of Markhammarkham.ca
Fast-growing city with diverse communities, strong tech industry, numerous corporate headquarters, quality infrastructure, and recognized as a top government employer. |
1,839 |
| 33 |
City of London, Canadalondon.ca
A large team of over 3000 employees in London delivering 100+ services, working together to build a better city for all |
1,749 |
| 34 |
ONresources | RichessesONontario.ca
A government ministry responsible for managing Ontario's natural resources sustainably to support economic prosperity, environmental sustainability, and quality of life for residents |
1,728 |
| 35 |
Environment, Conservation and Parks | Environnement, Protection de la nature et Parcsontario.ca
Environmental organization responsible for conservation, protection, and management of Ontario's environment, nature, and parks in Canada |
1,711 |
| 36 |
Treasury Board of Canada Secretariat | Secrétariat du Conseil du Trésor du Canadacanada.ca
The company provides advice and recommendations on government spending, regulations, and management to ensure tax dollars are spent wisely for Canadians |
1,655 |
| 37 |
Treasury Board Secretariat | Secrétariat du Conseil du Trésorontario.ca
The organization focuses on enhancing government transparency, accountability, and value for money, while improving services for the people of Ontario |
1,640 |
| 38 |
Municipal Property Assessment Corporationmpac.ca
An independent organization in Ontario accurately assesses and classifies all properties, prioritizing employee well-being with generous benefits and flexible work arrangements |
1,595 |
| 39 |
City of Kitchenerkitchener.ca
Deliver diverse municipal services including planning, engineering, IT, operations, horticulture, emergency response, and community center management for residents. |
1,526 |
| 40 |
City of Windsorcitywindsor.ca
Provides municipal services and governance for Windsor, Ontario, including public inquiries and community support through accessible contact numbers. |
1,515 |
| 41 |
City of Greater Sudburygreatersudbury.ca
Dynamic team in Northeastern Ontario's regional capital focused on enhancing citizens' quality of life through services in technology, tourism, education, government, and health |
1,443 |
| 42 |
Toronto Community Housingtorontohousing.ca
Canada's largest social housing provider, serving nearly 60,000 low and moderate-income households in Toronto, creating partnerships to build vibrant communities |
1,376 |
| 43 |
Town of Oakvilleoakville.ca
The company focuses on creating and preserving a vibrant, livable community in Oakville within the Greater Toronto Area |
1,372 |
| 44 |
Labour, Immigration, Training and Skills / Travail, Immigration, Formation et Compétencesontario.ca
The company promotes safe, fair, and harmonious workplace practices in Ontario, focusing on occupational health and safety, employment rights, and labor relations |
1,342 |
| 45 |
City Of Guelphguelph.ca
Provides diverse public programs and services supporting community well-being, inclusion, employee development, and environmental care in a growing city. |
1,318 |
| 46 |
Children, Community and Social Services | Services à l’enfance et Services sociaux et communautairesontario.ca
Government organization in Ontario focused on providing services and support for children, communities, and social welfare initiatives |
1,297 |
| 47 |
City of Richmond Hillrichmondhill.ca
Creating a welcoming, diverse, and sustainable community through exceptional public services and partnership with residents for managed growth and environmental sustainability |
1,224 |
| 48 |
City of Burlingtonburlington.ca
The City of Burlington offers a collaborative and award-winning work environment with excellent benefits, flexible work arrangements, and a focus on public service |
1,197 |
| 49 |
City of Barriebarrie.ca
Provides municipal services, maintains infrastructure, supports community development, and fosters connections to improve quality of life for residents. |
1,185 |
| 50 |
Department of Fisheriesfisheries.gov.bd
Established in 1908, the Department of Fisheries in Bangladesh works on maximizing fish production, poverty alleviation through employment generation, and marine fisheries |
1,184 |
| 51 |
Housing, Infrastructure and Communities Canada | Logement, Infrastructures et Collectivités Canadahousing-infrastructure.canada.ca
Infrastructure Canada collaborates with governments and partners to invest in modern public infrastructure, fostering inclusive, connected, and resilient communities throughout Canada |
1,110 |
| 52 |
City of Kingstoncityofkingston.ca
The company is dedicated to creating a smart, livable 21st century city with a diverse economy, world-class institutions, and vibrant entertainment and tourism activities |
1,103 |
| 53 |
Ontario Finance | Ontario Financesontario.ca
The Ministry of Finance in Ontario provides fiscal, taxation, and economic policy advice, prepares budgets, and oversees agencies supporting provincial programs |
1,052 |
| 54 |
County of Simcoesimcoe.ca
The County of Simcoe is a diverse workplace offering competitive salaries, benefits, and opportunities for career development in a picturesque location |
994 |
| 55 |
Finance Canada / Finances Canadafin.canada.ca
The Department supports the Government of Canada in developing and implementing policies in various areas such as economics, finance, security, and international relations |
893 |
| 56 |
City of Thunder Baythunderbay.ca
This organization in Thunder Bay focuses on promoting economic development, education, and a clean, green community while supporting a high quality of life for residents |
877 |
| 57 |
Office of the Superintendent of Financial Institutions Canadaosfi-bsif.gc.ca
Independent agency ensuring safety and soundness of Canadian financial system by supervising banks, insurers, trust companies, and private pension plans. |
876 |
| 58 |
City of Oshawaoshawa.ca
Local government providing community services, infrastructure, education, transit, and economic development to support a growing, inclusive urban population. |
868 |
| 59 |
Canada School of Public Service | École de la fonction publique du Canadacsps-efpc.gc.ca
The Canada School of Public Service provides tailored learning products for the Canadian Public Service, helping employees apply relevant knowledge in their work environments |
866 |
| 60 |
City of Brantfordbrantford.ca
Dedicated community staff deliver programs/services to enhance residents' quality of life CAO leads departments to meet community demands/expectations Talent investment for building a better city |
854 |
| 61 |
Town of Miltonmilton.ca
The company promotes Milton, Ontario as a fast-growing community with diverse opportunities for families, individuals, visitors, and investors Visit miltonca/socialmedia for more information |
815 |
| 62 |
Library and Archives Canada | Bibliothèque et Archives Canadabibliotheque-archives.canada.ca
Preserving and providing access to Canada's documentary heritage through acquiring, preserving, and making accessible publications, archival documents, recordings, and more |
800 |
| 63 |
Office of the Auditor General of Canada / Bureau du vérificateur général du Canadaoag-bvg.gc.ca
The company conducts independent audits and studies to provide objective information, advice, and assurance to government bodies, including Parliament and crown corporations |
796 |
| 64 |
Privy Council Officecanada.ca
Supporting the Prime Minister and Cabinet to implement vision, goals, and decisions in a timely manner at the highest administrative level |
790 |
| 65 |
Municipality of Chatham-Kentchatham-kent.ca
A municipality in Ontario with a population of 100,000+, Chatham-Kent focuses on providing services, preserving heritage, and promoting economic growth in a diverse region |
773 |
| 66 |
City of Waterloowaterloo.ca
Provides diverse municipal jobs and services, supports employee development, promotes safety, diversity, and community involvement for residents. |
754 |
| 67 |
Kawartha Lakeskawarthalakes.ca
Municipality in Central Ontario with diverse urban and rural areas, offering a range of municipal services through various departments |
746 |
| 68 |
Town of Caledoncaledon.ca
A dynamic municipality balancing urban, rural, and agricultural communities, offering a rewarding work environment with flexible arrangements, continuous learning, and competitive benefits |
724 |
| 69 |
Toronto Fire Servicestoronto.ca
All-hazards municipal fire service in Toronto, Ontario providing full-time emergency response and fire protection services to the community |
695 |
| 70 |
Natural Sciences and Engineering Research Council of Canada (NSERC)nserc-crsng.gc.ca
Investments in natural sciences and engineering research, supporting discoveries, industry partnerships, and training for over 30,000 students and fellows. |
673 |
| 71 |
Elections Ontarioelections.on.ca
A non-partisan office within the Legislative Assembly of Ontario responsible for administering provincial elections in Ontario led by the Chief Electoral Officer |
661 |
| 72 |
City of Peterboroughpeterborough.ca
A diverse and inclusive community in Central Ontario, offering a variety of career opportunities with competitive compensation and excellent benefits |
658 |
| 73 |
City of St. Catharinesstcatharines.ca
A vibrant city in the Niagara Region offering diverse attractions, festivals, and experiences to enhance quality of life for residents and visitors alike |
638 |
| 74 |
Town of Newmarketnewmarket.ca
A dynamic and diverse town in York Region, known for being one of the best places to live in Canada with innovative environmental projects and premium amenities |
633 |
| 75 |
Ontario Parks | Parcs Ontarioontarioparks.ca
An exceptional network of parks that protects and manages Ontario's Provincial Park system, providing opportunities for inspiration, enjoyment, and education for future generations |
587 |
| 76 |
Norfolk Countynorfolkcounty.ca
A municipality in Southern Ontario known for its agriculture, award-winning wineries, sandy beaches, outdoor activities, and cultural festivals, focusing on tourism and economic development |
579 |
| 77 |
City of Sault Ste. Mariesaultstemarie.ca
Leading municipal corporation promoting economic and social growth through efficient provision of services and community partnerships |
571 |
| 78 |
Town of Whitbywhitby.ca
A lakefront community focused on building an age-friendly environment, revitalizing historic downtowns, and encouraging growth for residents and businesses |
568 |
| 79 |
City of Cambridge Ontariocambridge.ca
Fast-growing city with diverse industries including manufacturing, technology, pharmaceuticals, and services, fostering a multicultural, close-knit community with strong values. |
556 |
| 80 |
The Corporation of the Town of Ajaxajax.ca
A leading municipal sector innovator in Ontario, providing services to a rapidly growing community through strategic priorities and a customer-focused approach |
544 |
| 81 |
City of Niagara Fallsniagarafalls.ca
The company promotes Niagara Falls as a family-friendly location with various activities, beautiful trails, golf courses, and community-focused recreational amenities |
536 |
| 82 |
National Capital Commission - Commission de la capitale nationalencc-ccn.gc.ca
The organization is responsible for long-term planning of federal lands in the Capital Region, stewardship of significant public places, and excellence in development and conservation |
533 |
| 83 |
Canadian Institutes of Health Research | Instituts de recherche en santé du Canadacihr-irsc.gc.ca
A government health research investment agency in Canada, supporting researchers and trainees to create new knowledge for improved healthcare outcomes |
517 |
| 84 |
The Alcohol and Gaming Commission of Ontarioagco.ca
Regulating alcohol, gaming, horse racing, and cannabis retail sectors in Ontario, ensuring honesty, integrity, and public interest Offering diverse career opportunities |
498 |
| 85 |
City of Pickeringpickering.ca
A welcoming and diverse municipality in Durham Region, offering a high quality of life, business opportunities, career development, and equitable workplace environment |
494 |
| 86 |
Municipality of Claringtonclarington.net
A municipality in Durham Region offering career opportunities, emphasizing teamwork and diversity, with a focus on providing accessibility accommodations for all |
481 |
| 87 |
Public Prosecution Service of Canada | Service des poursuites pénales du Canadappsc-sppc.gc.ca
National prosecuting authority for federal offences, providing legal advice and assistance to law enforcement Prosecutes cases related to environmental, financial, organized crime, terrorism, and regulatory offences |
479 |
| 88 |
Electrical Safety Authorityesasafe.com
Dedicated team of over 500 professionals ensuring electrical safety regulations in Ontario, promoting safe living, working, and playing environments. |
476 |
| 89 |
County of Wellingtonwellington.ca
Rural municipalities in south-western Ontario, fostering inclusive communities and equitable workplaces with diverse applicants welcomed Explore career opportunities online |
433 |
| 90 |
Town of Halton Hillshaltonhills.ca
Contribute to improving the quality of life in a dynamic town with metropolitan amenities, small-town charm, historical preservation, and natural beauty |
418 |
| 91 |
Oxford Countyoxfordcounty.ca
A municipal government in southwestern Ontario focused on sustainable growth, renewable energy, waste reduction, poverty alleviation, and providing various community services |
416 |
| 92 |
Ontario Ministry of Long-Term Care | Ministère des Soins de longue durée de l'Ontarioontario.ca
Official account representing Ontario’s Ministry of Long-Term Care, sharing information and engaging with the public on social media platforms |
397 |
| 93 |
ONeconomy | ÉconomieONontario.ca
Dedicated team delivering policies and services to support businesses in Ontario to start, grow, invest, trade, create jobs, and attract investment |
380 |
| 94 |
Northumberland Countynorthumberland.ca
Northumberland County is a municipal government uniting seven municipalities to provide abundant opportunities, prioritize career growth, and cultivate an inclusive workplace culture |
380 |
| 95 |
Colleges, Universities, Research & Security | Collèges, Universités, Recherche & Sécuritéontario.ca
Government organization responsible for overseeing training, colleges, and universities to ensure quality education and workforce development in the province |
379 |
| 96 |
Canada Council for the Arts | Conseil des arts du Canadacanadacouncil.ca
This organization is Canada's national public arts funder, supporting a creative and diverse arts scene across Canada and globally |
373 |
| 97 |
County of Brantbrant.ca
The County of Brant seeks motivated individuals to create a vibrant, safe, and caring community, offering services to residents, visitors, and businesses |
371 |
| 98 |
City of Cornwallcornwall.ca
This municipal government in Eastern Ontario with close to 50,000 residents offers vital services and career opportunities, promoting a high quality of life for its residents |
360 |
| 99 |
Standards Council of Canada (SCC)scc-ccn.ca
A Canadian organization established in 1970 specializing in standards and accreditation to protect public health, safety, well-being, and promote business prosperity globally |
343 |
| 100 |
Hastings Countyhastingscounty.com
Hastings County offers human services such as Ontario Works, Child Care, Subsidized Housing, Long Term Care, and Land Ambulance, along with Planning and Economic Development Services |
342 |
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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 Oct 24, 2026.
More company lists in Ontario
- The largest companies in Ontario 4,330
- Financial services firms in Ontario 315
- Critical infrastructure operators in Ontario 262
- SaaS companies in Ontario 232
- Financial Services companies in Ontario 228
- Retail chains in Ontario 213
- Truck Transportation companies in Ontario 206
- Transportation, Logistics, Supply Chain and Storage companies in Ontario 196
- Public sector organisations in Ontario 196
- Hospitals and Health Care companies in Ontario 195
- Software Development companies in Ontario 188
- IT Services and IT Consulting companies in Ontario 179
- Manufacturers in Ontario 169
- Education providers in Ontario 148
- Logistics companies in Ontario 133
- Healthcare providers in Ontario 131
- Construction companies in Ontario 127
- Insurance companies in Ontario 123
- Contract manufacturers in Ontario 113
- Retail companies in Ontario 113
- Non-profit Organizations companies in Ontario 106
- Higher Education companies in Ontario 102
- Distributors and wholesalers in Ontario 100
- Real Estate companies in Ontario 98
The same list elsewhere in Canada
- Government Administration companies in Canada 324
- Government Administration companies in the province of Quebec 83
- Government Administration companies in British Columbia 48
- Government Administration companies in Alberta 32
- Government Administration companies in Quebec City 33
- Government Administration companies in Ottawa 30