The 32 largest critical infrastructure operators in Washington (2026 list)

#	Company	Industry	Headquarters	Employees	Founded
1	United States Postal Service usps.com Delivers mail and packages to over 157 million addresses nationwide, connecting every American, every door, every business, everywhere, funded by sales, not tax dollars.	Government Administration	🇺🇸 Washington	159,003	n/a
2	Amtrak amtrak.com A transportation company with 21,000 route miles across North America, operating high-speed trains to over 500 destinations while prioritizing customer needs and safety	Rail Transportation	🇺🇸 Washington	13,914	1971
3	Fannie Mae fanniemae.com Provides affordable mortgage credit and financing solutions to support homebuyers and renters, promoting stability and accessibility in housing markets.	Financial Services	🇺🇸 Washington	12,201	1938
4	Washington Metropolitan Area Transit Authority (WMATA)wmata.com A regional transit company in the DC area, offering rail, bus, and paratransit services, seeking innovators to tackle system challenges	Urban Transit Services	🇺🇸 Washington	6,711	1967
5	Federal Deposit Insurance Corporation (FDIC)fdic.gov Protecting deposits by insuring up to $250,000 in banks and thrift institutions, monitoring risks, and minimizing economic impact of failures since 1933	Banking	🇺🇸 Washington	6,690	1933
6	FINRA finra.org Regulatory organization focusing on investor protection and market integrity by enforcing rules for over 3,300 financial firms and 610,000 brokers	Financial Services	🇺🇸 Washington	6,112	2007
7	United States Department of the Air Force af.mil A military department of the US Department of Defense that oversees the organization of the United States Air Force and United States Space Force	Armed Forces	🇺🇸 Washington	5,392	1947
8	VA Healthcare Administration va.gov The organization is the largest integrated healthcare system in America, providing medical care to 9 million enrolled veterans through various health care facilities	Hospitals and Health Care	🇺🇸 Washington	4,778	n/a
9	MedStar Georgetown University Hospital medstarhealth.org A leading not-for-profit hospital in DC offering innovative medical treatments, research, and compassionate care in various specialties like neurosciences and cancer	Hospitals and Health Care	🇺🇸 Washington	4,215	1898
10	MedStar Washington Hospital Center medstarhealth.org A prominent not-for-profit teaching and research hospital in the nation's capital, specializing in cardiology, cardiac surgery, stroke care, trauma, and burn treatment	Hospitals and Health Care	🇺🇸 Washington	4,010	1958
11	Bureau of Reclamation usbr.gov A key player in water resource management, providing irrigation water to farmers and delivering water to over 31 million people in the western states	Government Administration	🇺🇸 Washington	3,623	1902
12	Federal Reserve Board federalreserve.gov Central bank managing monetary policy, supervising banks, maintaining financial stability, and providing financial services to government and institutions.	Banking	🇺🇸 Washington	2,964	1913
13	Cogent Communications cogentco.com Provides high-quality Internet, Ethernet, and Colocation services to enterprises worldwide through a vast all-optical IP network.	Telecommunications	🇺🇸 Washington	2,890	1999
14	Federal Reserve System selectminds.com The company is the central bank of the United States, promoting a stable economy through monetary policy, bank supervision, and financial services	Banking	🇺🇸 Washington	2,249	n/a
15	Federal Highway Administration highways.dot.gov Supporting state and local governments in designing, constructing, and maintaining highways to ensure safety and innovation in the transportation system	Government Administration	🇺🇸 Washington	2,077	1967
16	The George Washington University Hospital gwhospital.com A hospital in Washington, DC region, part of UHS, focused on defining medicine through research, innovation, education, and patient-centered care	Hospitals and Health Care	🇺🇸 Washington	1,950	n/a
17	Pepco Holdings exeloncorp.com A major energy delivery company in the Mid-Atlantic region serving over 2 million customers with regulated electricity and natural gas services	Utilities	🇺🇸 Washington	1,868	n/a
18	National Nuclear Security Administration (NNSA)energy.gov A semi-autonomous agency within the US Department of Energy, dedicated to safeguarding the nation's nuclear stockpile, promoting global security, and addressing emerging challenges	Government Administration	🇺🇸 Washington	1,701	2000
19	Sibley Memorial Hospital hopkinsmedicine.org A not-for-profit, full-service community hospital in Washington, DC offering various medical services, skilled nursing care, and state-of-the-art facilities	Hospitals and Health Care	🇺🇸 Washington	1,590	1890
20	Howard University Hospital huhealthcare.com A Level One Trauma Center with a rich history, providing comprehensive healthcare facilities and medical education in the District of Columbia	Hospitals and Health Care	🇺🇸 Washington	1,442	1862
21	Metropolitan Washington Airports Authority mwaa.com Management and operation of two major airports providing domestic and international air service with dedicated administration, security, and emergency services.	Airlines and Aviation	🇺🇸 Washington	1,157	1987
22	DC Water dcwater.com Providing innovative solutions and leadership to address environmental challenges in the nation's capital through skilled and dedicated employees.	Utilities	🇺🇸 Washington	1,055	n/a
23	Walter Reed Army Medical Center en.wikipedia.org A medical center specializing in serving the needs of US Army personnel while providing advanced healthcare services	Hospitals and Health Care	🇺🇸 Washington	971	1947
24	Mid-Atlantic Permanente Medical Group \| Kaiser Permanente kpmidatlantic.sapphirecareselect.com A premier multi-specialty medical group working exclusively with Kaiser Foundation Health Plan, providing innovative care to over 800,000 members in Mid-Atlantic region	Medical Practices	🇺🇸 Washington	879	n/a
25	IDB Invest idbinvest.org Multilateral bank providing financial solutions and advisory services to sustainable private sector companies for economic, social, and environmental growth in Caribbean countries.	Financial Services	🇺🇸 Washington	867	n/a
26	Unity Health Care unityhealthcare.org A leading network of community health centers in Washington, DC providing healthcare services to over 106,000 patients annually	Hospitals and Health Care	🇺🇸 Washington	773	1985
27	The GW Medical Faculty Associates gwdocs.com A leading medical group with over 700 providers across 50 specialties, committed to comprehensive patient care, healthcare education, and advancing discovery	Hospitals and Health Care	🇺🇸 Washington	747	n/a
28	WGL wgl.com A leading energy solutions source offering natural gas, electricity, green power, and energy services in 30 states, focusing on making energy easy for customers	Utilities	🇺🇸 Washington	708	n/a
29	MedStar National Rehabilitation Hospital medstarhealth.org A regional rehabilitation network in Washington, DC, Maryland, and Northern Virginia, offering inpatient, day treatment, and outpatient services for various neurologic and orthopedic conditions	Hospitals and Health Care	🇺🇸 Washington	528	n/a
30	Genser Energy genserenergy.com Specializing in sustainable distributed generation energy solutions, the company powers the future of Africa with a focus on environmental friendliness	Oil and Gas	🇺🇸 Washington	397	n/a
31	Washington Health System whs.org A healthcare system in southwestern Pennsylvania with over 350 physicians dedicated to providing high quality care and improving community health	Hospitals and Health Care	🇺🇸 Washington	352	1897
32	Waterman Logistics watermanlogistics.com A global shipping company specializing in Roll On/Roll Off services, known for solving complex challenges and offering comprehensive logistics solutions worldwide	Truck Transportation	🇺🇸 Washington	6	1919

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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.

The 32 largest critical infrastructure operators in Washington

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