Top 39 critical infrastructure operators in New Hampshire (2026 list)

These are critical infrastructure operators, predominantly large healthcare systems, in New Hampshire. Dartmouth Hitchcock Medical Center and Clinics is an integrated health system. Concord Hospital Health System is a nonprofit health system. Elliot Health System provides comprehensive healthcare services. Service Credit Union is a member-owned financial cooperative.

The data shows a strong concentration in the healthcare sector, with many hospitals and health systems founded in the late 19th century, such as Elliot Health System (1890), Southern New Hampshire Health (1891), and Cheshire Medical Center (1892).

#	Company	Industry	Headquarters	Employees	Founded
1	Dartmouth Hitchcock Medical Center and Clinics dartmouth-hitchcock.org Integrated health system providing advanced medical care, cancer treatment, pediatric services, and extensive ambulatory clinics across New Hampshire and Vermont.	Hospitals and Health Care	🇺🇸 Lebanon	7,814	n/a
2	Transavia transavia.com An airline with 50 years of experience flying passengers to over 160 destinations, offering easy booking, various fare options, and dedicated services for business travelers	Airlines and Aviation	🇺🇸 Schiphol	5,275	1965
3	Cordaan werkenbijcordaan.nl The company provides care and support for individuals of all ages and backgrounds, focusing on promoting self-reliance and respecting individual choices and differences	Hospitals and Health Care	🇺🇸 Amsterdam	3,647	1683
4	Concord Hospital Health System concordhospital.org Nonprofit health system in New Hampshire with multiple campuses, providing integrated healthcare services to meet community needs and improve lives	Hospitals and Health Care	🇺🇸 Concord	2,909	n/a
5	Elliot Health System elliothospital.org Comprehensive healthcare services focused on improving community wellness, patient healing, and compassionate care throughout New Hampshire.	Hospitals and Health Care	🇺🇸 Manchester	2,666	1890
6	GGZ Noord-Holland-Noord ggz-nhn.nl A mental health organization in Noord-Holland providing innovative, patient-centered care by competent professionals using the latest scientific knowledge and personal commitment	Mental Health Care	🇺🇸 Heerhugowaard	1,743	1997
7	Catholic Medical Center catholicmc.com A regional healthcare organization providing high quality and innovative healthcare services in a compassionate environment, with roots dating back to 1892	Hospitals and Health Care	🇺🇸 Manchester	1,597	n/a
8	Dartmouth Health dartmouth-health.org Leading academic health system in New Hampshire, serving northern New England with top-ranked hospital, comprehensive cancer center, children's hospital, clinics, and research initiatives	Hospitals and Health Care	🇺🇸 Lebanon	1,481	n/a
9	Southern New Hampshire Health snhhealth.org Leading healthcare network in northern MA and southern NH with primary, emergency, specialty, pediatric, and maternal care services Affiliated with Massachusetts General Hospital	Hospitals and Health Care	🇺🇸 Nashua	1,388	1891
10	Exeter Hospital exeterhospital.org A tax-exempt community-based hospital affiliated with Exeter Health Resources, focused on innovative, quality healthcare services across various medical specialties	Hospitals and Health Care	🇺🇸 Exeter	1,081	n/a
11	Valley Regional Hospital vrh.org Valley Regional Hospital provides modern healthcare services including private patient rooms, emergency care, cancer care, primary care, rehabilitation, imaging, and more since 1893	Hospitals and Health Care	🇺🇸 Claremont	1,022	1893
12	Service Credit Union servicecu.org Member-owned financial cooperative offering banking services across multiple states and Germany, focusing on member well-being and community support.	Banking	🇺🇸 Portsmouth	925	1957
13	Cheshire Medical Center cheshiremed.org A non-profit community hospital in New Hampshire's Monadnock Region providing a wide range of specialties, comprehensive care, and a supportive team environment	Hospitals and Health Care	🇺🇸 Keene	888	1892
14	Portsmouth Regional Hospital - New Hampshire wwwprod104-portsmouthhospital-sitecore-cloud.dpxmedcity.net A 234-bed acute care hospital in Portsmouth, NH, offering comprehensive cardiovascular, neurosurgical, and stroke care as part of HCA Healthcare's Capital Division	Hospitals and Health Care	🇺🇸 Portsmouth	820	n/a
15	KAS BANK caceis.com Specialized asset servicing banking group providing a comprehensive range of services across Europe, North America, and Asia to financial institutions and corporate clients	Banking	🇺🇸 Amsterdam	816	1806
16	Northeast Rehabilitation Hospital Network northeastrehab.com Provide inpatient and outpatient rehabilitation care for injuries and illnesses in New Hampshire and Massachusetts Services include therapy, home care, sports medicine, and pain management clinics	Hospitals and Health Care	🇺🇸 Salem	658	1984
17	ConvenientMD convenientmd.com A leading urgent care provider in New England focused on making healthcare more convenient, with plans for expanding primary care services	Hospitals and Health Care	🇺🇸 Portsmouth	648	2012
18	St. Joseph Hospital (Nashua, NH)stjosephhospital.com A leading-edge acute care community hospital providing innovative medical care, leading-edge technology, and specialized treatment services with a dedicated physician network	Hospitals and Health Care	🇺🇸 Nashua	564	1908
19	Cottage Hospital linktr.ee A critical access hospital in Woodsville, NH with 25 beds, 250 employees, 37 medical staff, and 35 volunteers serving the Upper Connecticut River Valley	Hospitals and Health Care	🇺🇸 Woodsville	523	1903
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20	Sprague Operating Resources LLC spragueenergy.com A leading independent supplier of energy and materials handling services in the Northeast, offering products like home heating oil, diesel, gasoline, and natural gas	Oil and Gas	🇺🇸 Portsmouth	508	1870
21	FirstLight Fiber firstlight.net A fiber-based company in the Northeast and Mid-Atlantic providing high-capacity, low-latency fiber optic network, data centers, managed services, and cloud solutions to enterprise and carrier customers	Telecommunications	🇺🇸 Portsmouth	470	1999
22	New Hampshire Mutual Bancorp nhmutual.com A shared services organization providing operational support for multiple mutual savings banks and a financial advisory and trust company in northern New England	Banking	🇺🇸 Concord	460	2013
23	Monadnock Community Hospital monadnockcommunityhospital.com A 25-bed rural community hospital providing quality care in a modern facility nestled near Mount Monadnock, prioritizing patient privacy and tranquility	Hospitals and Health Care	🇺🇸 Peterborough	459	1923
24	New London Hospital newlondonhospital.org A rural community hospital providing high-quality healthcare services to the Lake Sunapee region in central New Hampshire, with a focus on patient-centered care and community collaboration	Hospitals and Health Care	🇺🇸 New London	448	1918
25	Unitil unitil.com A public utility company delivering natural gas and electricity in New England with a focus on safety, reliability, and community involvement	Utilities	🇺🇸 Hampton	437	1984
26	Frisbie Memorial Hospital wwwprod104-frisbiehospital-sitecore-cloud.dpxmedcity.net Dedicated to providing safe, effective, and patient-centered healthcare services to the community, while collaborating with other providers to enhance overall health	Hospitals and Health Care	🇺🇸 Rochester	425	n/a
27	Parkland Medical Center parklandmedicalcenter.com An acute care hospital providing high-quality healthcare services including emergency care, behavioral health, cardiology, oncology, orthopedics, women's and children's services, and surgical care	Hospitals and Health Care	🇺🇸 Derry	399	n/a
28	Mascoma Bank mascoma.bank Mutually owned bank focused on community reinvestment, prioritizing customers with local decision-making and a wide range of financial services	Banking	🇺🇸 Lebanon	370	1899
29	City of Manchester, NH manchesternh.gov A public sector organization in Manchester with a focus on upholding core values like service, pride, integrity, respect, initiative, and teamwork	Government Administration	🇺🇸 Manchester	360	1846
30	Alice Peck Day Memorial Hospital alicepeckday.org A healthcare organization within the Dartmouth Health system, providing personalized care to over 80,000 patients annually with a focus on diverse and inclusive services	Hospitals and Health Care	🇺🇸 Lebanon	329	1932
31	New Hampshire Department of Transportation (NHDOT)dot.nh.gov A transportation department in New Hampshire ensuring safe, efficient travel options and protecting the environment Offers career opportunities and traffic updates online	Truck Transportation	🇺🇸 Concord	317	n/a
32	Lighthouse Credit Union lighthousecu.org A purpose-driven credit union investing in communities through financial services, competitive benefits, and opportunities to make a positive impact	Financial Services	🇺🇸 Dover	317	1936
33	Mental Health Center of Greater Manchester mhcgm.org A leading community mental health center in New Hampshire offering behavioral health services for all ages, with a focus on short-term counseling	Mental Health Care	🇺🇸 Manchester	315	n/a
34	Huggins Hospital hugginshospital.org A non-profit community hospital in Wolfeboro, NH offering primary, secondary, and specialty health care services to residents and visitors	Hospitals and Health Care	🇺🇸 Wolfeboro	295	n/a
35	Littleton Regional Healthcare littletonhealthcare.org Non-profit Critical Access Hospital in New Hampshire's White Mountains, offering primary and specialty healthcare to the North Country of New Hampshire and Northeast Kingdom of Vermont	Hospitals and Health Care	🇺🇸 Littleton	264	1907
36	PSNH, now Eversource Energy eversource.com A united energy company serving New England, focused on delivering reliable energy and superior customer service Bringing communities together through energy	Utilities	🇺🇸 Manchester	167	n/a
37	New Hampshire Electric Cooperative, Inc.nhec.com A member-owned electric distributor serving 84,000 members in 115 towns in New Hampshire, with over 5,500 miles of energized line	Utilities	🇺🇸 Plymouth	126	1939
38	Patriot Hydro LLC patriothydro.com The company provides local, reliable, and renewable clean energy production while focusing on safety, compliance, and high performance of generating facilities	Renewable Energy Power Generation	🇺🇸 Manchester	27	n/a
39	NextEra Energy Seabrook, LLC nexteraenergyresources.com This company based in Seabrook, NH delivers clean energy solutions in North America, developing, constructing, and operating power projects while promoting environmental stewardship and community care	Oil and Gas	🇺🇸 Seabrook	25	n/a

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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 Nov 14, 2026.

Top 39 critical infrastructure operators in New Hampshire

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