67 leading critical infrastructure operators in Maryland (2026 list)

#	Company	Industry	Headquarters	Employees	Founded
1	Johns Hopkins Medicine hopkinsmedicine.org Coordinates research, teaching, patient care, and related enterprises for the university's School of Medicine and health system, including hospitals and healthcare practices.	Hospitals and Health Care	🇺🇸 Baltimore	39,325	n/a
2	University of Maryland Medical System umms.org Multi-hospital system providing trauma, cancer, neuro, cardiac, women's, children's health, rehabilitation, and kidney transplant services across Maryland and beyond.	Hospitals and Health Care	🇺🇸 Baltimore	15,960	1984
3	Johns Hopkins Hospital hopkinsmedicine.org Leading hospital providing expert patient care, emergency services, and specialized medical support to local and international patients.	Hospitals and Health Care	🇺🇸 Baltimore	14,032	1889
4	Constellation constellationenergy.com Leader in clean energy production and services, accelerating transition to carbon-free future through diverse energy portfolio, sustainability initiatives, and technology investments	Utilities	🇺🇸 Baltimore	13,291	n/a
5	Bon Secours bonsecours.com Not-for-profit Catholic health system operating hospitals, senior housing, home care, and hospice services across seven states on East Coast.	Hospitals and Health Care	🇺🇸 Marriottsville	10,384	n/a
6	MedStar Health medstarhealth.org Not-for-profit health system providing medical care, education, research, and training with a patient-first approach in Maryland and Washington, D.C.	Hospitals and Health Care	🇺🇸 Columbia	10,037	1999
7	CareFirst BlueCross BlueShield carefirst.com Providing affordable, accessible, and quality healthcare services to over 3.5 million people with empathy, innovation, and community focus.	Insurance	🇺🇸 Baltimore	7,214	1934
8	OneMain Financial onemainfinancial.com A leading provider of responsible credit access for nonprime customers, focusing on improving financial well-being and offering personal loans and credit cards	Financial Services	🇺🇸 Baltimore	7,203	1912
9	University of Maryland Medical Center umm.edu A renowned teaching hospital in Baltimore providing comprehensive healthcare services, specializing in trauma, cancer care, organ transplants, and minimally invasive surgeries since 1823	Hospitals and Health Care	🇺🇸 Baltimore	6,540	n/a
10	Indian Health Service ihs.gov A US government agency providing comprehensive healthcare services to American Indian and Alaska Native communities through various career opportunities and programs	Hospitals and Health Care	🇺🇸 Rockville	6,468	1955
11	Centers for Medicare & Medicaid Services cms.gov Administration of Medicare, Medicaid, CHIP, and Health Insurance Marketplace providing health coverage to over 160 million Americans nationwide.	Government Administration	🇺🇸 Baltimore	6,340	1977
12	Montgomery County Government montgomerycountymd.gov Providing responsive government services, affordable housing, transportation, education, health, safety, economic vitality, and inclusive community support for residents.	Government Administration	🇺🇸 Rockville	4,825	n/a
13	LifeBridge Health lifebridgehealth.org Regional healthcare organization providing hospital services, primary and specialty care, wellness programs, and community health education in northwest Baltimore.	Hospitals and Health Care	🇺🇸 Baltimore	4,617	1998
14	Luminis Health luminishealth.org A nationally recognized health system in Maryland providing high-quality care at nearly 100 sites of care, prioritizing health equity and community partnerships	Hospitals and Health Care	🇺🇸 Parole	4,547	n/a
15	Piedmont Airlines piedmont-airlines.com An airline with a long history of providing scheduled service to over 70 cities in the eastern US and Canada Operating the ERJ-145 aircraft	Airlines and Aviation	🇺🇸 Salisbury	3,883	1931
16	Exelon Generation constellationenergy.com A leading producer of carbon-free energy, offering power and energy products for homes and businesses nationwide, accelerating the transition to clean energy	Oil and Gas	🇺🇸 Baltimore	3,675	n/a
17	LAPO Microfinance lapo-nigeria.org A microfinance bank in Nigeria offering financial products to support small businesses and low-income households nationwide through a large branch network	Banking	🇺🇸 Maryland	3,501	1987
18	Adventist HealthCare adventisthealthcare.com Faith-based healthcare organization in Maryland, dedicated to improving physical, mental, and spiritual health through hospitals, rehabilitation centers, home care, and physician networks	Hospitals and Health Care	🇺🇸 Gaithersburg	3,422	1907
19	Sheppard Pratt sheppardpratt.org A leading nonprofit provider of mental health, substance use, special education, and social services through hospital- and community-based resources, prioritizing global mental health care quality	Mental Health Care	🇺🇸 Baltimore	3,354	n/a
20	Hughes hughes.com Provides broadband equipment, services, and network operations to millions of consumers, businesses, and governments worldwide via satellite and multi-transport technologies.	Telecommunications	🇺🇸 Germantown	3,209	1971
21	Holy Cross Health holycrosshealth.org A Catholic, not-for-profit health system in Maryland offering a full range of inpatient, outpatient, and community-based services to over 200,000 patients annually	Hospitals and Health Care	🇺🇸 Silver Spring	3,007	1963
22	Kennedy Krieger Institute kennedykrieger.org A renowned institute in Baltimore, MD, specializing in improving the lives of children and adolescents with brain, spinal cord, and musculoskeletal disorders	Hospitals and Health Care	🇺🇸 Baltimore	2,841	1937
23	GBMC HealthCare gbmc.org A not-for-profit healthcare corporation with a regional hospital, primary care providers, specialists, and end-of-life care services, dedicated to patient-centered care	Hospitals and Health Care	🇺🇸 Baltimore	2,603	1965
24	Mercy Medical Center, Baltimore, MD careers.mdmercy.com Catholic health care facility in Baltimore providing cutting-edge medical services, recognized for excellence in nursing and various medical specialties	Hospitals and Health Care	🇺🇸 Baltimore	2,352	1874
25	Walter Reed National Military Medical Center walterreed.tricare.mil Largest joint military medical center providing specialized healthcare, education, research, and operational readiness for wounded and ill military beneficiaries.	Hospitals and Health Care	🇺🇸 Bethesda	1,920	n/a
26	Frederick Health frederickhealth.org Comprehensive healthcare services including a hospital, medical group, employer solutions, home care, and hospice, serving Frederick County, MD	Hospitals and Health Care	🇺🇸 Frederick	1,790	1902
27	TidalHealth tidalhealth.org Health system on Delmarva Peninsula focused on quality care and community impact Committed to improving health in resilient communities through connected teamwork	Hospitals and Health Care	🇺🇸 Salisbury	1,636	1899
28	Baltimore Gas and Electric bge.com Maryland's largest gas and electric utility delivering power to over 13 million electric customers and 700,000 natural gas customers, emphasizing safety, reliability, and energy conservation	Utilities	🇺🇸 Baltimore	1,604	1816
29	Meritus Health meritushealth.com A leading healthcare provider in Western Maryland with over 3,000 employees, serving over 200,000 residents with 327 beds and 160 providers	Hospitals and Health Care	🇺🇸 Hagerstown	1,579	1905
30	WSSC Water wsscwater.com A leading water and wastewater utility established in 1918, serving 19 million residents with a vast network of pipelines meeting federal standards	Utilities	🇺🇸 Laurel	1,448	1918
31	University of Maryland Baltimore Washington Medical Center umbwmc.org A 285-bed acute-care facility part of the University of Maryland Medical System, providing high-quality healthcare services including various specialized centers and services	Hospitals and Health Care	🇺🇸 Glen Burnie	1,446	1965
32	Howard County Government howardcountymd.gov Focus on public safety, education, fiscal management, environmental protection, and community health to create a vibrant, efficient local government.	Government Administration	🇺🇸 Ellicott City	1,417	n/a
33	Suburban Hospital hopkinsmedicine.org A non-profit hospital in Maryland, offering cutting-edge medical services and distinguished stroke, trauma, cardiac, orthopedic, neuroscience, and oncology programs	Hospitals and Health Care	🇺🇸 Bethesda	1,328	1943
34	Baltimore Police Department baltimorepolice.org A dedicated police department serving the residents, business owners, and visitors of Baltimore, organizing into nine districts to police the city's land and waterways	Law Enforcement	🇺🇸 Baltimore	1,324	1853
35	MedStar Franklin Square Medical Center medstarhealth.org A top community teaching hospital providing leading-edge medical services, recognized for excellence in nursing and quality care Contact for appointments	Hospitals and Health Care	🇺🇸 Baltimore	1,190	1898
36	Johns Hopkins Howard County Medical Center hopkinsmedicine.org Providing award-winning health care services to improve community health through innovation, collaboration, service excellence, diversity, and patient safety since 1973	Hospitals and Health Care	🇺🇸 Columbia	1,162	n/a
37	Maryland State Highway Administration roads.maryland.gov A long-standing organization focused on building and maintaining quality infrastructure through a dedicated team and continuous skill development programs	Civil Engineering	🇺🇸 Baltimore	1,019	n/a
38	Maryland Department of Transportation mdot.maryland.gov A customer-driven provider of safe, sustainable, intelligent transportation solutions connecting customers to life's opportunities	Government Administration	🇺🇸 Hanover	1,019	1971
39	Carroll Hospital lifebridgehealth.org A community hospital turned medical center offering top-notch programs and services, such as Family Birthplace, surgical services, Imaging Center, and wellness center	Hospitals and Health Care	🇺🇸 Westminster	982	1961
40	MedStar Union Memorial Hospital medstarhealth.org A leading not-for-profit acute care teaching hospital specializing in cardiac care, orthopaedics, sports medicine, and various outpatient services in Maryland	Hospitals and Health Care	🇺🇸 Baltimore	910	1854
41	UM Upper Chesapeake Health umuch.org A not-for-profit health care system in northeastern Maryland, providing clinical expertise, advanced technology, and community-focused services for residents' wellness and health education	Hospitals and Health Care	🇺🇸 Bel Air	902	n/a
42	Howard County General Hospital hopkinsmedicine.org Providing award-winning healthcare services since 1973, committed to improving community health through innovation, collaboration, diversity, service excellence, and patient safety	Hospitals and Health Care	🇺🇸 Columbia	843	1973
43	University of Maryland St. Joseph Medical Center umstjoseph.org A not-for-profit community hospital offering a wide range of clinical programs and centers of excellence, committed to zero patient harm and exceptional care	Hospitals and Health Care	🇺🇸 Towson	835	1864
44	Lower lower.company We make homeownership more accessible by offering mortgage lending services through a variety of brands and branches across the country	Financial Services	🇺🇸 Columbia	747	2014
45	MedStar Southern Maryland Hospital Center medstarhealth.org A full-service acute care facility offering emergency care, critical care, outpatient services, behavioral health programs, cancer treatment, and community health promotion initiatives	Hospitals and Health Care	🇺🇸 Clinton	741	n/a
46	MedStar Harbor Hospital medstarhealth.org A community-focused hospital offering state-of-the-art healthcare services, governed by a board of trustees, and dedicated to meeting patients' needs	Hospitals and Health Care	🇺🇸 Baltimore	731	1903
47	Stella Maris Inc stellamaris.org A nonprofit long-term care facility offering health, residential, hospice, dementia care, counseling, rehabilitation, pastoral, and senior day center services	Hospitals and Health Care	🇺🇸 Lutherville Timonium	710	1953
48	Peninsula Regional Medical Center tidalhealth.org Health system with hospitals, health campuses, and doctor's offices across multiple locations dedicated to enhancing the well-being of communities served	Hospitals and Health Care	🇺🇸 Salisbury	709	1897
49	CalvertHealth calverthealthmedicine.org A private, not-for-profit hospital in Southern Maryland providing high-quality care, with a wide range of specialties and community-focused services	Hospitals and Health Care	🇺🇸 Prince Frederick	691	1919
50	Sandy Spring Bank atlanticunionbank.com A premier community bank in the Greater Washington, DC region offering commercial and retail banking, mortgage, wealth management, and trust services	Banking	🇺🇸 Olney	685	1868
51	EagleBank eaglebankcorp.com A local community business bank in Maryland, Northern Virginia, and DC, offering superior customer service and custom financial solutions for businesses and individuals	Banking	🇺🇸 Bethesda	653	1998
52	Frederick Regional Health System frederickhealth.org A private, not-for-profit 298 bed hospital in Frederick offering education on healthy lifestyle choices, disease prevention, outpatient care, and immediate care services	Hospitals and Health Care	🇺🇸 Frederick	633	1902
53	Tower Federal Credit Union towerfcu.org Member-owned financial institution offering a variety of products and services, with headquarters in Maryland and serving over 210,000 members worldwide through branches and digital banking	Financial Services	🇺🇸 Laurel	622	1953
54	UPMC Western Maryland wmhs.com A healthcare provider offering general and specialty medical services, diagnostic testing, and health promotion activities to improve community health	Hospitals and Health Care	🇺🇸 Cumberland	621	1996
55	Asbury Communities, Inc.asbury.org A leader in aging services, providing vibrant retirement living, long-term care, and innovative wellness opportunities for older adults across four states	Hospitals and Health Care	🇺🇸 Frederick	617	1926
56	MedStar Montgomery Medical Center medstarhealth.org Acute care hospital providing emergency services, inpatient beds, wellness programs, and community health resources in Montgomery County.	Hospitals and Health Care	🇺🇸 Olney	613	1918
57	Advanced Radiology advancedradiology.com Specializing in diagnostic imaging services, our board-certified radiologists offer advanced technology for accurate diagnoses at multiple locations throughout Maryland, accepting all major insurances	Hospitals and Health Care	🇺🇸 Baltimore	574	n/a
58	Defense Information Systems Agency disa.mil A combat support agency of the DoD providing command and control capabilities, enterprise information infrastructure, and DODIN operations for joint warfighters	Other	🇺🇸 Fort Meade	572	1947
59	Calvert County Government calvertcountymd.gov Established in 1654, this organization operates in Calvert County, Maryland, offering a high standard of living and diverse industries	Government Administration	🇺🇸 Prince Frederick	553	1654
60	MedStar St. Mary's Hospital medstarhealth.org A 103-bed full-service community hospital in Maryland offering state-of-the-art emergency, inpatient, and outpatient care with a focus on excellence and compassionate medical care	Hospitals and Health Care	🇺🇸 Leonardtown	415	1912
61	U.S. Financial Technology usfintech.com This company operates a mortgage securitization platform for Fannie Mae and Freddie Mac, providing issuance, administration, disclosure, and tax services	Financial Services	🇺🇸 Bethesda	330	2014
62	NASA Federal Credit Union nasafcu.com Offers financial services and career opportunities, including competitive salaries, benefits, and professional development programs to its employees and members.	Financial Services	🇺🇸 Upper Marlboro	303	1949
63	Competitive Power Ventures cpv.com Development and operation of efficient, low-emission electric generation and renewable projects, advancing next-generation technologies and decarbonization goals.	Utilities	🇺🇸 Silver Spring	181	1999
64	Chaberton Energy chaberton.com A public benefit corporation focused on sustainable infrastructure and renewable energy projects, emphasizing distributed energy and community solar initiatives	Renewable Energy Power Generation	🇺🇸 Rockville	57	2020
65	SkyPoint Federal Credit Union skypointfcu.com A premier financial institution offering a wide array of services in Maryland, Virginia, and DC, prioritizing member needs, financial integrity, and value	Financial Services	🇺🇸 Germantown	37	1968
66	Calvert Cliffs Nuclear Power Plant Inc calvertcliffs.com An energy company offering electricity, natural gas, and sustainable solutions to both residential and business customers	Oil and Gas	🇺🇸 Baltimore	37	n/a
67	U.S. EcoGen, LLC usecogen.com A company dedicated to developing and operating clean renewable energy facilities for Utility & Federal customers in an environmentally responsible manner nationwide	Utilities	🇺🇸 Potomac	2	2009

Turn this list into pipeline

Tamtam finds the decision-makers at every company on a list like this one, with verified emails, phone numbers and the buying signals that tell you when to reach out.

Build your own list, free

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.

67 leading critical infrastructure operators in Maryland

Turn this list into pipeline

How this list is built

More company lists in Maryland

The same list elsewhere in United States