| # | Company | Employees |
|---|---|---|
| 1 |
Social Security Administrationssa.gov
A government agency providing financial protection and support through retirement, disability, and survivors benefits to over 64 million individuals and families nationwide |
47,537 |
| 2 | 17,527 | |
| 3 |
State of Marylandjobapscloud.com
This company offers various opportunities for full-time, part-time, contractual, internship, and seasonal positions in public service in the state of Maryland |
10,542 |
| 4 |
Centers for Medicare & Medicaid Servicescms.gov
Administration of Medicare, Medicaid, CHIP, and Health Insurance Marketplace providing health coverage to over 160 million Americans nationwide. |
6,340 |
| 5 |
National Cancer Institute (NCI)cancer.gov
Leading federal agency for cancer research, part of the National Institutes of Health Visit wwwcancergov for more information Privacy policy available |
5,247 |
| 6 |
Montgomery County Governmentmontgomerycountymd.gov
Providing responsive government services, affordable housing, transportation, education, health, safety, economic vitality, and inclusive community support for residents. |
4,825 |
| 7 |
City of Baltimorebaltimorecity.gov
The company is based in Baltimore, Maryland, and focuses on historical preservation, with a focus on National Register historic districts and public monuments |
3,376 |
| 8 |
USDA Animal and Plant Health Inspection Service (APHIS)aphis.usda.gov
This organization protects agriculture and natural resources, regulates genetically modified organisms, enforces the Animal Welfare Act, and manages wildlife damage |
3,235 |
| 9 |
Baltimore Countybaltimorecountymd.gov
Supports businesses and individuals in Baltimore County with resources and opportunities to thrive, emphasizing a diverse community and vibrant environment for success |
3,043 |
| 10 |
U.S. Nuclear Regulatory Commissionnrc.gov
Licensing and regulating civilian radioactive materials to ensure public health, safety, security, and environmental protection nationwide. |
2,628 |
| 11 |
Health Resources and Services Administration (HRSAgov), HHShrsa.gov
Enhance healthcare access for underserved, rural communities, support people with HIV, strengthen maternal-child health, and expand healthcare workforce. |
2,571 |
| 12 |
Prince George's Countyprincegeorgescountymd.gov
The Office of Human Resources Management in Prince George's County provides expertise in recruiting, training, and supporting employees while promoting health, wellness, and financial planning |
2,069 |
| 13 |
Maryland Department of Healthhealth.maryland.gov
Protect health and well-being of Maryland residents through regulation, healthcare system oversight, disease prevention, and ensuring access to quality care. |
1,925 |
| 14 |
Maryland-National Capital Park and Planning Commissionmncppc.org
Manage parks and recreation, plan land use, protect natural and cultural resources, serve diverse communities in Montgomery and Prince George's Counties. |
1,904 |
| 15 |
Howard County Governmenthowardcountymd.gov
Focus on public safety, education, fiscal management, environmental protection, and community health to create a vibrant, efficient local government. |
1,417 |
| 16 |
Prince George's County, Marylandprincegeorgescountymd.gov
Urban county in the Baltimore/Washington corridor bordering DC and Baltimore Offers diverse culture, economic opportunities, and scenic living environment |
1,370 |
| 17 |
National Institute of Allergy and Infectious Diseases (NIAID)niaid.nih.gov
Conducts and supports research on infectious, immunologic, and allergic diseases to develop therapies, vaccines, and technologies for improved global health |
1,330 |
| 18 |
Frederick County Government, Marylandfrederickcountymd.gov
Official account for Frederick County Government showcasing rich history and bright future Working towards becoming the #2023HealthiestCounty for a population of 243,675 |
1,200 |
| 19 |
Substance Abuse and Mental Health Services Administration (SAMHSA)samhsa.gov
A leading agency in the US Department of Health and Human Services focused on advancing behavioral health, reducing substance abuse, and supporting mental health nationwide |
1,103 |
| 20 |
Maryland Department of Human Servicesdhs.maryland.gov
A leading social services provider in Maryland, assisting over one million people annually through economic support, preventive services, and protecting vulnerable populations |
1,086 |
| 21 |
Maryland Department of Transportationmdot.maryland.gov
A customer-driven provider of safe, sustainable, intelligent transportation solutions connecting customers to life's opportunities |
1,019 |
| 22 |
NOAA Fisheriesfisheries.noaa.gov
Utilizing science-based approaches, the organization focuses on conservation and management of marine resources to promote sustainable living and healthy ecosystems |
861 |
| 23 |
Harford County Governmentharfordcountymd.gov
Harford County Government in Maryland serves 250,000 residents with an elected County Executive and seven-member Council, providing programs and services |
772 |
| 24 |
M-NCPPC, Department of Parks and Recreation, Prince George's Countypgparks.com
Dedicated to providing parks, recreation programs, and services to enhance quality of life in communities through citizen partnership and open space preservation |
764 |
| 25 |
Baltimore County Police Departmentbaltimorecountymd.gov
Law enforcement agency ensuring safety, enforcing laws, preventing crime, preserving peace, and protecting rights of all citizens in Baltimore County |
743 |
| 26 |
Maryland Department of Natural Resourcesdnr.maryland.gov
The company in Maryland focuses on preserving, protecting, restoring, and enhancing the environment for future generations through sustainable practices and diverse outdoor recreation opportunities |
717 |
| 27 |
Maryland State Department of Education (MSDE)marylandpublicschools.org
The company is focused on providing a high-quality and equitable education for students in Maryland through various services and strategic plans |
685 |
| 28 |
Maryland Department of the Environmentmde.maryland.gov
The company focuses on promoting healthy and sustainable communities in Maryland through service, science-driven regulation, innovation, integration, partnerships, performance tracking, and employee development |
672 |
| 29 |
National Heart, Lung, and Blood Institutenhlbi.nih.gov
A global leader in research, training, and education to prevent and treat heart, lung, and blood diseases, promoting longer, fulfilling lives |
631 |
| 30 |
Maryland Department of Laborlabor.maryland.gov
The company focuses on creating a fair, inclusive environment in Maryland by supporting residents, businesses, and ensuring workplace safety and economic growth |
619 |
| 31 |
City of Rockvillerockvillemd.gov
Provides citizen-centric public services for a diverse community, supporting prominent biomedical and technology companies while maintaining neighborhoods and local economic growth. |
597 |
| 32 |
Comptroller of Marylandmarylandcomptroller.gov
Elected official in Maryland overseeing state finances, tax administration, accounting for state agencies, regulating fuel industries, and serving on state boards/commissions |
592 |
| 33 |
Calvert County Governmentcalvertcountymd.gov
Established in 1654, this organization operates in Calvert County, Maryland, offering a high standard of living and diverse industries |
553 |
| 34 |
Baltimore City Health Departmentbaltimorecity.gov
Providing public health services in Baltimore since 1793, focused on improving residents' health through various programs and initiatives |
519 |
| 35 |
Maryland Transportation Authoritymdta.maryland.gov
A transportation authority in Maryland managing toll facilities including turnpikes, tunnels, and bridges, funded by toll revenue from customers |
458 |
| 36 |
Maryland Department of Housing and Community Development (DHCD)dhcd.maryland.gov
The organization collaborates with partners to provide financing for housing opportunities and support the revitalization of communities in Maryland |
457 |
| 37 |
Rural Developementrd.usda.gov
A government administration involved in rural development initiatives, located in Riverdale, MD, United States |
424 |
| 38 |
Carroll County Government, MDcarrollcountymd.gov
Local government managing eight municipalities within a metropolitan area, providing governance and services to diverse communities and districts. |
409 |
| 39 |
St. Mary's County Governmentstmaryscountymd.gov
The company is located in St Mary's County, Maryland and is a hub for aviation and advanced technology, steeped in historical significance |
400 |
| 40 |
City of Gaithersburggaithersburgmd.gov
Company revitalized Gaithersburg into a thriving city by fostering business, agricultural, residential, and commercial growth while preserving its heritage and promoting cultural and recreational activities |
394 |
| 41 |
Bureau of Economic Analysisbea.gov
The company provides accurate and objective data on the US economy, including GDP, state and local numbers, trade stats, and industry data |
376 |
| 42 |
Maryland Department of Emergency Management (MDEM)mdem.maryland.gov
The company works towards reducing disaster risks and managing consequences through collaborative efforts with communities and partners in Maryland |
364 |
| 43 |
The City of Frederickcityoffrederickmd.gov
The City of Frederick Department of Human Resources offers rewarding public sector careers with competitive salaries, benefits, and opportunities to serve a vibrant community |
363 |
| 44 |
Federal Occupational Healthhhs.gov
An established agency offering comprehensive administrative services to the US government, including finance, procurement, real estate, logistics, and occupational health |
346 |
| 45 |
Housing Authority of Baltimore Cityhabc.org
A leading public housing authority in Baltimore, serving over 19,500 households with various federally-funded housing programs and related services |
340 |
| 46 |
MTA Marylandmta.maryland.gov
State-operated agency providing Local Bus, Light Rail, Metro Subway, Commuter Bus, and Mobility paratransit services throughout the Baltimore-Washington region and statewide technical support. |
331 |
| 47 |
Cecil County Governmentccgov.org
Cecil County, located in the mid-Atlantic region, is a rural area with preserved open spaces, rivers, and the Chesapeake Bay, governed by a five-member Board of County Commissioners |
295 |
| 48 |
Maryland Department of Service and Civic Innovationdsci.maryland.gov
Promoting service and volunteerism in Maryland through innovative programs established by the SERVE Act of 2023 |
290 |
| 49 |
Maryland Department of General Servicesdgs.maryland.gov
The company provides essential services and facilities management to the State of Maryland, enhancing work environments for stakeholders and citizens |
266 |
| 50 |
Maryland Department of Agriculturemda.maryland.gov
Dedicated to fostering profitable agriculture, environmental protection, and quality of life for Maryland residents through outstanding programs and services |
253 |
| 51 |
Maryland Insurance Administrationinsurance.maryland.gov
An independent state agency in Maryland that regulates the insurance industry, protects consumers by enforcing laws, ensures fair treatment, and assists with insurance-related complaints |
240 |
| 52 |
NOAA National Ocean Serviceoceanservice.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 |
199 |
| 53 |
Maryland Department of Assessments and Taxationdat.maryland.gov
This company assesses real property values, administers property tax credits, manages ground rent database, and oversees business filings in Maryland |
187 |
| 54 |
Charles County Governmentgovernmentjobs.com
This local government agency located outside the DC metropolitan area provides services and resources to support the community |
186 |
| 55 |
City of Takoma Parktakomaparkmd.gov
A municipality in Montgomery County, Maryland, the City of Takoma Park provides government services and maintains parks and community areas |
178 |
| 56 |
Advanced Research Projects Agency for Health (ARPA-H)arpa-h.gov
A government agency focused on solving complex health challenges through innovative research programs, aiming to empower all Americans to achieve optimal health |
178 |
| 57 |
Baltimore City Mayor's Office of Employment Developmentmoed.baltimorecity.gov
This company coordinates workforce development initiatives to meet the needs of Baltimore City employers and job seekers, promoting the local economy |
170 |
| 58 |
City of Laurel, MDcityoflaurel.org
The company is located in a strategic location within a major market Its City Council enacts laws for citizen protection and good governance |
168 |
| 59 |
Expert Consultantexpertconsultant.co.uk
Senior business analyst with IT and software expertise providing cross-industry business process optimization, IT project management, and technical documentation services. |
153 |
| 60 |
Allegany County Government - Marylandalleganygov.org
Promoting rural living in Allegany County, Maryland, with access to nature, cultural entertainment, and a relaxed pace of life |
153 |
| 61 |
City of Greenbelt, Marylandgreenbeltmd.gov
The City of Greenbelt provides a home to over 24,000 residents with small town charm and access to big-city conveniences in the Washington suburban area |
146 |
| 62 |
Program Support Centerhhs.gov
A shared services provider partnering with US Department of Health and Human Services agencies to offer cost-effective solutions for administrative challenges and foster government efficiency |
45 |
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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 Maryland
- The largest companies in Maryland 1,527
- IT Services and IT Consulting companies in Maryland 154
- Hospitals and Health Care companies in Maryland 113
- Education providers in Maryland 93
- IT services companies in Maryland 90
- Critical infrastructure operators in Maryland 67
- Healthcare providers in Maryland 66
- Public sector organisations in Maryland 64
- Construction companies in Maryland 63
- Retail chains in Maryland 62
- Financial services firms in Maryland 57
- Higher Education companies in Maryland 54
- Financial Services companies in Maryland 53
- SaaS companies in Maryland 50
- Non-profit Organizations companies in Maryland 48
- Aerospace and defence companies in Maryland 46
- Consulting firms in Maryland 44
- Software Development companies in Maryland 41
- Real Estate companies in Maryland 40
- Research Services companies in Maryland 38
- Hospitality companies in Maryland 37
- Manufacturers in Maryland 37
- Research institutes in Maryland 35
- Business Consulting and Services companies in Maryland 31
The same list elsewhere in United States
- Government Administration companies in the United States 2,059
- Government Administration companies in California 279
- Government Administration companies in Florida 113
- Government Administration companies in Texas 113
- Government Administration companies in New York State 93
- Government Administration companies in Virginia 69
- Government Administration companies in North Carolina 68
- Government Administration companies in Alabama 61
- Government Administration companies in Illinois 61
- Government Administration companies in Massachusetts 61
- Government Administration companies in Washington State 60
- Government Administration companies in Ohio 54
- Government Administration companies in Minnesota 51
- Government Administration companies in Michigan 50
- Government Administration companies in Colorado 49
- Government Administration companies in Arizona 48
- Government Administration companies in Georgia 48
- Government Administration companies in Pennsylvania 48
- Government Administration companies in New Jersey 40
- Government Administration companies in Oregon 40
- Government Administration companies in Wisconsin 40
- Government Administration companies in Tennessee 34
- Government Administration companies in Washington 99
- Government Administration companies in Sacramento 42