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List of critical infrastructure operators in Western Australia

Tamtam tracks 29 critical infrastructure operators headquartered in Western Australia. This list ranks all of them by number of employees on LinkedIn, led by Department of Health (WA Health), Woodside Energy and St John of God Health Care. Their median headcount is 1,329. Half of them were founded in 1983 or later. The most common headquarters are Perth (15).

πŸ‡¦πŸ‡Ί Western Australia29 companiesUpdated Oct 24, 2026
#CompanyIndustryHeadquarters EmployeesFounded
1
Department of Health (WA Health)health.wa.gov.au

Provision of public hospitals, mental health, dental, Aboriginal health, and disaster preparedness services across Western Australia for all communities.

Hospitals and Health Care πŸ‡¦πŸ‡Ί Perth 6,881 n/a
2
Woodside Energywoodside.com

Operate diversified oil and gas assets globally with focus on safety, efficiency, environmental performance, and growth in gas, oil, and new energy sectors.

Oil and Gas πŸ‡¦πŸ‡Ί Perth 5,933 1954
3
St John of God Health Caresjog.org.au

A leading provider of high-quality health care and community services in Australia and New Zealand, focusing on healing, hope, and dignity for all

Hospitals and Health Care πŸ‡¦πŸ‡Ί Perth 4,826 1895
4
Water Corporationwatercorporation.com.au

Provides water, wastewater, drainage services, and bulk water for irrigation to homes, businesses, and farms in Western Australia, managing substantial infrastructure.

Utilities πŸ‡¦πŸ‡Ί Leederville 4,546 n/a
5
Western Powerwesternpower.com.au

Safe, reliable electricity transmission and distribution across south Western Australia, maintaining extensive network serving over one million customers.

Utilities πŸ‡¦πŸ‡Ί Perth 3,177 n/a
6
Bankwestbankwest.com.au

Dedicated team at Bankwest focuses on customers' needs Contact via phone or social media for banking services and support

Financial Services πŸ‡¦πŸ‡Ί Perth 2,949 n/a
7
Silverchain Groupsilverchain.org.au

A leading Australian organization providing high-quality, in-home health and aged care services supported by research, technology, and compassionate care

Hospitals and Health Care πŸ‡¦πŸ‡Ί Perth 2,214 1894
8
WA Country Health Servicewacountry.health.wa.gov.au

Provider of comprehensive health services in Western Australia, covering a vast area with regional hospitals, mental health units, health centers, and outreach services

Hospitals and Health Care πŸ‡¦πŸ‡Ί East Perth 2,202 n/a
9
Public Transport Authoritypta.wa.gov.au

Responsible for metropolitan rail, bus, ferry services, regional transport, school bus assistance, infrastructure planning, and innovative capital projects.

Government Administration πŸ‡¦πŸ‡Ί Perth 2,188 2003
10
INPEX Australiainpex.com.au

A leading oil and gas exploration company in Australia, involved in major projects like Ichthys LNG, with a strong focus on growth and success

Oil and Gas πŸ‡¦πŸ‡Ί Perth 2,160 n/a
11
Fiona Stanley Hospitalfsfhg.health.wa.gov.au

A 783-bed public hospital providing comprehensive clinical services, research, and education, equipped with advanced medical technology and single occupancy patient rooms for comfort and privacy

Hospitals and Health Care πŸ‡¦πŸ‡Ί Murdoch 2,054 2014
12
Department of Fire and Emergency Servicesdfes.wa.gov.au

A volunteer-based organization in Western Australia that provides comprehensive emergency management during natural disasters and emergency incidents, supported by over 26,000 dedicated volunteers

Public Safety πŸ‡¦πŸ‡Ί Cockburn Central 1,597 n/a
13
Main Roads Western Australiamainroads.wa.gov.au

Planning, building, and maintaining a vast state road network across Western Australia, collaborating with partners and supporting diverse road users.

Government Administration πŸ‡¦πŸ‡Ί Perth 1,423 1926
14
Child and Adolescent Health Servicecahs.health.wa.gov.au

A health service in Western Australia that specializes in treating children and adolescents, offering a range of programs and services

Hospitals and Health Care πŸ‡¦πŸ‡Ί Nedlands 1,335 n/a
15
North Metropolitan Health Servicenmhs.health.wa.gov.au

Provider of comprehensive hospital and health services to over 729,144 residents in Western Australia, offering tertiary, secondary, and specialist care

Hospitals and Health Care πŸ‡¦πŸ‡Ί Nedlands 1,329 n/a
16
Royal Perth Hospitalrph.health.wa.gov.au

A leading hospital offering adult major trauma, complex surgery, mental health, and specialized medical services since 1855 in Western Australia

Hospitals and Health Care πŸ‡¦πŸ‡Ί Perth 1,311 1855
17
South Metropolitan Health Servicesouthmetropolitan.health.wa.gov.au

A network of health services providing high quality, innovative, and accessible healthcare to over 648,000 people in southern Perth, Western Australia

Hospitals and Health Care πŸ‡¦πŸ‡Ί Murdoch 1,296 2016
18
Synergy (Electricity Generation and Retail Corporation)synergy.net.au

Leading energy generator and retailer supplying reliable, affordable electricity and gas to over one million residential and business customers in Western Australia.

Utilities πŸ‡¦πŸ‡Ί Perth 1,058 2006
19
East Metropolitan Health Serviceemhs.health.wa.gov.au

A hospital and health service network in East Metropolitan region of Western Australia providing comprehensive healthcare services to over 725,000 residents

Hospitals and Health Care πŸ‡¦πŸ‡Ί Perth 953 2016
20
PATHWEST LABORATORY MEDICINE WApathwest.health.wa.gov.au

Leading provider of pathology and forensic services in Western Australia, offering a wide range of diagnostic testing, teaching, research, and clinical support to the community

Hospitals and Health Care πŸ‡¦πŸ‡Ί Nedlands 886 n/a
21
iiNetiinet.net.au

An Australian ISP offering ADSL2+ and nbnβ„’ services with a focus on customer service and passion for connecting Australians better

Telecommunications πŸ‡¦πŸ‡Ί Perth 829 n/a
22
Horizon Powerhorizonpower.com.au

Provide safe, reliable power to regional customers, addressing unique challenges across diverse locations with dedicated local service and support.

Utilities πŸ‡¦πŸ‡Ί Bentley 746 2006
23
Brightwater Care Group Ltd.brightwatergroup.com

A leading not-for-profit provider of aged care, disability, and retirement services, supporting people of all ages to improve their quality of life

Hospitals and Health Care πŸ‡¦πŸ‡Ί Osborne Park 709 1901
24
Menzies Aviationmenziesaviation.com

The company provides tailored landside and airside services at over 200 airport locations worldwide, including ground handling, cargo, fuelling, and executive services

Airlines and Aviation πŸ‡¦πŸ‡Ί Perth Airport 687 1833
25
Amana Livingamanaliving.com.au

Amana Living provides a wide range of aged care services in Western Australia, focusing on truth, integrity, and personal enrichment for residents

Hospitals and Health Care πŸ‡¦πŸ‡Ί Subiaco 663 n/a
26
Aegis Aged Care Groupaegiscare.com.au

A leading residential aged care provider in Western Australia, offering premium accommodation and personalized care to ensure comfort, security, and fulfilling lives for residents

Hospitals and Health Care πŸ‡¦πŸ‡Ί Perth 626 1983
27
Hollywood Private Hospital

Hospital & health care provider located in Nedlands, Australia, offering services at Monash Ave Specializes in medical care and treatments

Hospitals and Health Care πŸ‡¦πŸ‡Ί Nedlands 597 n/a
28
Hall & Prior Health & Aged Care Grouphallprior.com.au

Revolutionizing aged care by providing award-winning programs and services, focused on enriching the lives of seniors through community, nature, and innovation

Hospitals and Health Care πŸ‡¦πŸ‡Ί West Perth 572 1992
29
Perth Airportperthairport.com.au

A gateway to Western Australia, Perth Airport is a major airport facilitating economic development, passenger traffic, and tourism promotion in the region

Aviation and Aerospace Component Manufacturing πŸ‡¦πŸ‡Ί Perth 567 n/a

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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 Oct 24, 2026.

More company lists in Western Australia

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