The 54 largest companies in Silver Spring (2026 list)

#	Company	Industry	Headquarters	Employees	Founded
1	FDA fda.gov Agency safeguards public health by ensuring human, veterinary drugs, biologics, medical devices, food, cosmetics, radiation-emitting products, tobacco products, all safe and effective.	Government Administration	🇺🇸 Silver Spring	17,527	n/a
2	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
3	American Nurses Association nursingworld.org Advocating for 5 million registered nurses, promoting high standards in nursing practice, advancing healthcare quality, and supporting nurses' health and wellness	Non-profit Organizations	🇺🇸 Silver Spring	2,528	n/a
4	National Weather Service weather.gov This company provides weather, water, and climate data services, forecasts, warnings, and decision support for safety and economic benefit, with various career opportunities available	Environmental Services	🇺🇸 Silver Spring	2,369	1890
5	SEVENTH DAY ADVENTIST CHURCH adventist.org A religious denomination based in Silver Spring, MD, focused on Seventh-day Adventist beliefs and practices	Religious Institutions	🇺🇸 Silver Spring	2,337	1863
6	ADRA International adra.org ADRA provides unconditional assistance to families worldwide by offering essentials, livelihood support, health care, education, disaster relief, and empowerment programs	Non-profit Organizations	🇺🇸 Silver Spring	2,018	1983
7	United Therapeutics Corporation unither.com Biotechnology company developing unique products for patients with chronic conditions, with a focus on providing transplantable organs Employees collaborate worldwide	Pharmaceutical Manufacturing	🇺🇸 Silver Spring	1,515	1996
8	General Conference of Seventh-day Adventists gc.adventist.org The company operates a worldwide network of education institutions, publishing houses, media outlets, hospitals, clinics, and humanitarian agencies	Religious Institutions	🇺🇸 Silver Spring	1,105	1863
9	HIAS hias.org A humanitarian organization providing vital services to refugees and asylum seekers globally, advocating for their rights and creating a welcoming world	Non-profit Organizations	🇺🇸 Silver Spring	974	1881
10	NOAA Fisheries fisheries.noaa.gov Utilizing science-based approaches, the organization focuses on conservation and management of marine resources to promote sustainable living and healthy ecosystems	Government Administration	🇺🇸 Silver Spring	861	n/a
11	SEEC seeconline.org A progressive nonprofit agency providing community supports for people with developmental disabilities to live independently, pursue goals, and access resources for personal growth	Individual and Family Services	🇺🇸 Silver Spring	720	1987
12	Walter Reed Army Institute of Research wrair.health.mil The company conducts research to develop vaccines, drugs, and solutions to protect military personnel from infectious diseases and enhance their resilience and readiness	Research Services	🇺🇸 Silver Spring	678	1893
13	Ad Astra, Inc.ad-astrainc.com Global communication solutions and language services provider leveraging human expertise and technology to bridge linguistic divides for diverse industries	Translation and Localization	🇺🇸 Silver Spring	646	2010
14	Ahmadiyya Muslim Community alislam.org A not-for-profit religious entity associated with the Ahmadiyya Muslim Community	Religious Institutions	🇺🇸 Silver Spring	633	1889
15	Sisters of Mercy of the Americas sistersofmercy.org An international community of Roman Catholic women dedicated to the Gospel of Jesus, providing sponsor and operate numerous service organizations globally	Religious Institutions	🇺🇸 Silver Spring	549	1831
16	Urban One, Inc urban1.com The company is a leading distributor of urban content, including radio, television, and digital media, with a focus on representing Black culture	Broadcast Media Production and Distribution	🇺🇸 Silver Spring	527	1980
17	Security Industry Association (SIA)securityindustry.org This company represents and advocates for manufacturers, service providers, and integrators of electronic physical security equipment, while also promoting industry standards and professionalism	Security and Investigations	🇺🇸 Silver Spring	487	1969
18	Trees for the Future trees.org The company provides agroforestry training to farmers worldwide, promoting sustainable land practices and helping communities improve food systems	Environmental Services	🇺🇸 Silver Spring	435	1989
19	1st Choice, LLC 1stchoicegov.com Management consulting firm specializing in organizational performance improvement through strategic guidance, optimization of business operations, talent optimization, innovation, and cost savings for clients nationwide	Staffing and Recruiting	🇺🇸 Silver Spring	423	2000
20	Webs webs.com A company founded in 2001 offering a simple online marketing platform for small businesses, personal users, and non-profits, acquired by Vistaprint in 2011	Technology, Information and Internet	🇺🇸 Silver Spring	417	2001
21	Taxi Cab Driver A transportation company in Maryland offering taxi cab services from Silver Spring	Truck Transportation	🇺🇸 Silver Spring	400	n/a
22	Social & Scientific Systems s-3.com A health research company based in Maryland, providing technical and program management services to improve global public health outcomes	Research Services	🇺🇸 Silver Spring	393	1978
23	TV One tvone.tv TV One offers original programming, classic series, movies, and music for African American viewers, reaching millions of households through TV and HD channels	Broadcast Media Production and Distribution	🇺🇸 Silver Spring	392	n/a
24	Toole Design Group tooledesign.com Leaders in planning, engineering, and landscape architecture for active, multimodal transportation projects, pioneering innovative solutions to move people efficiently and sustainably	Civil Engineering	🇺🇸 Silver Spring	349	2003
25	Vietnam Veterans of America vva.org A national veterans organization founded in 1978, dedicated to advocating for veterans, ensuring quality healthcare, and supporting the next generation of war veterans	Non-profit Organizations	🇺🇸 Silver Spring	344	1978
26	IBSS ibsscorp.com Transformational consulting services in cybersecurity, IT, environmental science, and professional management Emphasis on employee growth, community engagement, and quality results	IT Services and IT Consulting	🇺🇸 Silver Spring	334	1992
27	General Conference Auditing Service (GCAS)gcasconnect.org Providing exceptional audit services to the Seventh-day Adventist Church as a way to serve God through our work	Accounting	🇺🇸 Silver Spring	327	1974
28	eSimplicity esimplicity.com Digital services and telecommunications company offering Healthcare IT, Cybersecurity, and Telecommunications solutions to improve healthcare, national security, and defense	IT Services and IT Consulting	🇺🇸 Silver Spring	310	2016
29	NOAA National Ocean Service oceanservice.noaa.gov A federal science agency specializing in ocean and coastal research, technology, and management, providing services, tools, and outreach for decision making and conservation efforts	Government Administration	🇺🇸 Silver Spring	199	n/a
30	Vitas Microfinance Group vitasgroup.com A for-profit microfinance organization providing reliable and affordable financing to small businesses in the Middle East and Romania, creating social impact and supporting job creation	Financial Services	🇺🇸 Silver Spring	183	2011
31	Family & Nursing Care familynursingcare.com Trusted family-owned home care agency since 1968, providing personalized caregiver services to enhance quality of life for clients in Maryland and Washington DC	Home Health Care Services	🇺🇸 Silver Spring	182	1968
32	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
33	International NGO Safety & Security Association (INSSA)inssa.org A global non-profit association dedicated to improving safety and security for humanitarian workers through advocacy, collaboration, education, and standardization	Non-profit Organizations	🇺🇸 Silver Spring	180	2010
34	Hope Channel International, Inc.hopechannelinternational.org A global network under the Seventh-day Adventist Church, providing holistic Christian living programs on faith, health, relationships, and community	Media and Telecommunications	🇺🇸 Silver Spring	177	2003
35	T. Howard Foundation t-howard.org The company promotes diversity in the media and entertainment industry by providing internships and career opportunities for men and women of color	Non-profit Organizations	🇺🇸 Silver Spring	174	1994
36	Naval Medical Research Command med.navy.mil Conducts research in a wide range of areas from infectious diseases to combat casualty care to support Navy, Marine Corps, and US warfighters	Research Services	🇺🇸 Silver Spring	170	1942
37	CCI Health Services cciweb.org Providing equitable and accessible healthcare services for vulnerable communities through a comprehensive approach including medical, behavioral, dental care, and specialty programs	Hospitals and Health Care	🇺🇸 Silver Spring	170	1969
38	Bobtail bobtail.com Bobtail is a company founded in 2015 with a mission to streamline the supply chain, eliminate inefficiencies, and promote innovation and respect	Financial Services	🇺🇸 Silver Spring	169	n/a
39	Summit Group summitmg.com This company partners with organizations to enhance their brand's strength and engage their target audiences through creative communications and recognition strategies	Marketing Services	🇺🇸 Silver Spring	165	1969
40	Association of Zoos and Aquariums aza.org Nonprofit organization promoting conservation, education, and recreation in zoos and aquariums Leading global wildlife conservation efforts and supporting animals in their natural habitats	Museums, Historical Sites, and Zoos	🇺🇸 Silver Spring	153	1924
41	A&T Systems, Inc.ats.com Provider specializing in mission critical IT and telecom infrastructure solutions for government and commercial clients, with expertise in data center, cloud computing, and telecommunications services	IT Services and IT Consulting	🇺🇸 Silver Spring	152	1984
42	CNA/NNOC/NNU nationalnursesunited.org A large union and professional organization of registered nurses in the US, advocating for nurses, patients, and healthcare workers worldwide	Non-profit Organizations	🇺🇸 Silver Spring	151	2009
43	Kids After Hours Inc kidsafterhours.com An individual & family services company providing childcare services located in Silver Spring, MD, United States	Individual and Family Services	🇺🇸 Silver Spring	151	n/a
44	Rackner rackner.com Innovative company specializing in DevSecOps, AI, Edge Computing, Cloud-Native development, with expertise in Kubernetes and WebAssembly Serving startups and government agencies	IT Services and IT Consulting	🇺🇸 Silver Spring	57	2015
45	PsychoGeriatric Services, LLC pgs-nhcare.com A clinician-owned healthcare practice in Silver Spring, MD offering comprehensive mental health services in long-term care facilities through expert clinical staff	Mental Health Care	🇺🇸 Silver Spring	42	1994
46	e-Management e-mcinc.com A provider of professional IT services and cybersecurity solutions, offering innovative software for cybersecurity assurance and Enterprise Risk Management to government agencies and commercial companies	IT Services and IT Consulting	🇺🇸 Silver Spring	39	1999
47	Mount Everest Consulting mtevc.com This company helps organizations with digital transformation by providing end-to-end services, specializing in AWS, Azure, Google Cloud Platform, and microservices consulting	IT Services and IT Consulting	🇺🇸 Silver Spring	30	2016
48	Georgetown Insurance Service, an Alera Group Company georgetownins.com Providing tailored business and personal insurance solutions in the DC metro area since 1977, focusing on exemplary customer service and cost-effective products	Insurance	🇺🇸 Silver Spring	25	1977
49	Homer Optical Company Inc.homeroptical.com A trusted lab partner for eye care professionals, offering in-house processing of premium lenses, expert training, marketing support, and strong industry relationships	Wholesale	🇺🇸 Silver Spring	25	1973
50	Spectrum Design + Build spectrumdesignbuild.com Specializing in design-build remodeling projects, Spectrum delivers professional, transparent, and high-quality renovations with personalized service and creative design solutions	Construction	🇺🇸 Silver Spring	11	2012
51	Zora Corp zorcorp.com A talent discovery platform helping companies find exceptional candidates for projects and teams Connect with us for a test-drive	Technology, Information and Internet	🇺🇸 Silver Spring	11	2009
52	Alfa International Enterprises A manufacturing company specializing in precision-machined products, providing quality items to an international market	Appliances, Electrical, and Electronics Manufacturing	🇺🇸 Silver Spring	8	n/a
53	e-SwapMeet e-swapmeet.com A swapping platform where users can exchange, buy, or sell unwanted items for home, business, personal, or recreational use, with an optional escrow service for secure transactions	Retail	🇺🇸 Silver Spring	3	2018
54	OSA Consulting osaconsultingdc.com OSA Consulting, LLC provides a diverse range of consulting services for aerospace, technology, nonprofit, political, fundraising, export control, and government-business relations	Aviation and Aerospace Component Manufacturing	🇺🇸 Silver Spring	3	2018

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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.

The same list elsewhere in United States

The largest companies in the United States 91,669
The largest companies in California 12,813
The largest companies in New York State 10,485
The largest companies in Texas 8,086
The largest companies in Florida 4,945
The largest companies in Illinois 4,175
The largest companies in Pennsylvania 3,110
The largest companies in Massachusetts 3,093
The largest companies in Georgia 2,632
The largest companies in Ohio 2,618
The largest companies in New Jersey 2,569
The largest companies in Virginia 2,503
The largest companies in Michigan 2,346
The largest companies in North Carolina 2,174
The largest companies in Alabama 1,806
The largest companies in Washington State 1,785
The largest companies in Colorado 1,774
The largest companies in Minnesota 1,700
The largest companies in Maryland 1,527
The largest companies in Wisconsin 1,482
The largest companies in New York 6,920
The largest companies in San Francisco 2,030
The largest companies in Houston 1,791
The largest companies in Chicago 1,668