| # | Company | Employees |
|---|---|---|
| 1 |
U.S. Department of Veterans Affairsva.gov
Recruitment of skilled employees dedicated to providing respectful and appropriate care and support services for United States veterans. |
202,010 |
| 2 |
United States Postal Serviceusps.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. |
159,003 |
| 3 |
Internal Revenue Serviceirs.gov
This company's LinkedIn account provides IRS updates, tax guidance, job opportunities, and emphasizes privacy protection, emphasizing integrity, fairness, and law enforcement |
49,242 |
| 4 |
U.S. Department of Homeland Securitydhs.gov
Protecting the nation through counterterrorism, border security, cybersecurity, emergency response, and partnerships to ensure safety and resilience. |
37,388 |
| 5 |
USDA Forest Servicefs.usda.gov
Administers national forests and grasslands, with a focus on sustaining their health, diversity, and productivity for current and future generations |
23,342 |
| 6 | 23,229 | |
| 7 | 19,336 | |
| 8 |
US Government Accountability Officegao.gov
Provide Congress with objective, fact-based information to improve federal government performance and ensure accountability for taxpayers' benefit. |
17,307 |
| 9 |
US Environmental Protection Agency (EPA)epa.gov
It protects human health and the environment by ensuring clean air, land, and water while enforcing federal environmental laws effectively. |
16,471 |
| 10 |
National Park Servicenps.gov
The company preserves, protects, and shares over 420 natural, cultural, and recreational sites across America, including national parks and historic places |
14,798 |
| 11 |
U.S. Department of the Treasuryhome.treasury.gov
Promotes economic prosperity, manages financial systems, advises government, enforces sanctions, and collaborates internationally to ensure financial stability and security. |
14,485 |
| 12 |
U.S. Department of Health and Human Services (HHS)hhs.gov
Protecting health of Americans and providing essential human services, focusing on vulnerable populations and those least able to help themselves. |
14,182 |
| 13 | 13,384 | |
| 14 |
U.S. Census Bureaucensus.gov
Leading provider of quality data about population and economy, ensuring privacy, confidentiality, innovation, and customer commitment. |
11,924 |
| 15 |
NOAA: National Oceanic & Atmospheric Administrationnoaa.gov
NOAA provides daily weather forecasts, climate monitoring, fisheries management, and marine commerce support, using cutting-edge research and technology |
11,487 |
| 16 |
U.S. Department of Educationed.gov
The company works to promote student achievement, foster educational excellence, ensure equal access to education, and collect data on schools |
11,240 |
| 17 |
U.S. Customs and Border Protectioncareers.cbp.gov
Securing national borders, ensuring traveler safety, preventing harmful products entry, and protecting millions of Americans across the country. |
9,653 |
| 18 |
U.S. Department of Labordol.gov
Promote worker welfare, improve working conditions, advance employment opportunities, and ensure work-related benefits and rights for U.S. workers. |
8,338 |
| 19 |
U.S. Small Business Administrationsba.gov
Established in 1953, this organization assists small business owners with counseling, capital, and contracting expertise to start, grow, expand, or recover confidently |
7,471 |
| 20 |
U.S. Department of Energy (DOE)energy.gov
Federal agency focused on restoring America's energy dominance through innovation, policy, and management of national energy resources and technologies. |
7,127 |
| 21 |
Bureau of Land Managementblm.gov
Management of 245 million acres of public lands focused on sustaining health, productivity, and enjoyment for present and future generations. |
6,567 |
| 22 |
U.S. Department of Housing and Urban Developmenthud.gov
The company works to create inclusive communities, provide affordable housing, strengthen the economy, and improve quality of life through sustainable practices |
6,425 |
| 23 |
DC Governmentdc.gov
The company operates as the government of the District of Columbia, overseeing executive, legislative, and judicial branches to provide city services |
6,335 |
| 24 |
U.S. Department of Energy (DOE)energy.gov
Address energy, environmental, and nuclear challenges through science, technology innovation, nuclear stockpile maintenance, and effective management for national security. |
6,238 |
| 25 |
U.S. Office of Personnel Management (OPM)opm.gov
The company provides human resources management services for the Federal Government, overseeing policies, benefits, hiring, and employee management programs for a secure workforce |
5,520 |
| 26 |
U.S. Department of Transportationtransportation.gov
Leadership in transportation safety, infrastructure innovation, economic growth, and connecting Americans to opportunities through diverse transportation programs and public service. |
5,480 |
| 27 |
U.S. Department of the Interiorcareers.doi.gov
Managing natural resources, honoring tribal cultures, overseeing energy production, and conserving wildlife across diverse U.S. lands and waters. |
5,111 |
| 28 | 4,756 | |
| 29 |
United States Federal Governmentusa.gov
This company serves as the national government of the United States, overseeing legislative, executive, and judicial branches as outlined in the US Constitution |
4,289 |
| 30 |
DoW Civilian Careersdodciviliancareers.com
An organization empowering individuals to find their purpose and explore careers related to the Department of Defense #DoDForward |
3,979 |
| 31 |
Bureau of Reclamationusbr.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 |
3,623 |
| 32 |
U.S. Department of Commercecommerce.gov
Promotes economic growth, strengthens domestic industry, supports job creation, and represents business interests across all U.S. communities. |
3,580 |
| 33 |
USDA-FSISfsis.usda.gov
A public health agency within the USDA responsible for ensuring the safety of meat, poultry, and egg products through inspections and regulations |
3,089 |
| 34 |
USDA Farm Service Agencyfsa.usda.gov
Agricultural accounting company in East Lansing, MI specializing in USDA services and support for farmers |
2,866 |
| 35 |
The White Housewhitehouse.gov
Government entity responsible for the administration and governance of the United States, serving as the official residence and workplace of the President |
2,759 |
| 36 |
Bureau of Labor Statisticsbls.gov
Collection, analysis, and dissemination of labor economics and statistical data to government, businesses, and the public for informed decision-making. |
2,416 |
| 37 |
U.S. National Archives and Records Administrationarchives.gov
Preserving and providing access to important historical and legal records created by the United States Federal government |
2,308 |
| 38 |
Federal Highway Administrationhighways.dot.gov
Supporting state and local governments in designing, constructing, and maintaining highways to ensure safety and innovation in the transportation system |
2,077 |
| 39 | 1,848 | |
| 40 |
USDA Rural Developmentrd.usda.gov
The company helps improve the economy and quality of life in rural America through home loans, grants, business development support, and more |
1,795 |
| 41 |
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 |
1,701 |
| 42 |
Cybersecurity and Infrastructure Security Agencycisa.gov
National coordinator for critical infrastructure security and resilience, and America's cyber defense agency. They secure national cyber and infrastructure. |
1,664 |
| 43 |
Veterans Benefits Administrationvba.va.gov
The VBA supports veterans by providing access to educational and financial resources to help them receive benefits |
1,556 |
| 44 |
Architect of the Capitolaoc.gov
Design, maintain, and enhance historic Capitol buildings and grounds, supporting Congress, Supreme Court, Library of Congress, and visitor experiences. |
1,547 |
| 45 |
Federal Energy Regulatory Commissionferc.gov
Regulation of energy markets ensuring fair rates, reliable infrastructure, and organizational excellence to support safe, secure, and efficient energy services. |
1,535 |
| 46 |
USDA Natural Resources Conservation Servicenrcs.usda.gov
The company partners with farmers to provide data, technology, and advice for sustainable land conservation and climate change mitigation in agriculture |
1,335 |
| 47 |
Federal Trade Commissionftc.gov
Federal agency protecting consumers and promoting competition, dedicated to advancing consumer interests and encouraging innovation in the economy. |
1,257 |
| 48 |
Consumer Financial Protection Bureauconsumerfinance.gov
A US government agency ensuring fair treatment by banks and financial companies, including sending information about job openings and handling personal data |
1,243 |
| 49 |
Office of the Director of National Intelligencedni.gov
Oversees federal intelligence agencies, manages national intelligence programs, advises president and National Security Council on intelligence and security matters. |
1,200 |
| 50 |
Pension Benefit Guaranty Corporation (PBGC)pbgc.gov
Since 1974, we have been protecting retirement security for over 33 million American workers, retirees, and families in private-sector pension plans |
1,074 |
| 51 |
Department of Veterans Affairs, Office of Inspector Generalvaoig.gov
Conduct audits, inspections, investigations to prevent waste and improve effectiveness of veterans programs and healthcare services nationwide. |
946 |
| 52 |
AmeriCorps NCCCamericorps.gov
Strengthen communities and develop leaders through team-based service, providing relief and support for disaster recovery, environmental conservation, and community projects nationwide. |
938 |
| 53 |
Department of Homeland Security, Office of Inspector Generaloig.dhs.gov
An independent agency within the Department of Homeland Security responsible for promoting efficiency, preventing fraud, and conducting oversight of DHS programs and operations |
908 |
| 54 |
Federal Student Aid an Office of the U.S. Department of Educationstudentaid.gov
Provider of student financial aid, offering over $120 billion in federal grants, loans, and work-study funds annually to help millions of students afford higher education |
886 |
| 55 |
DC Department of Healthdchealth.dc.gov
Promoting and protecting public health in the District of Columbia through education, disease prevention, community collaboration, and equitable resource access |
854 |
| 56 |
Federal Railroad Administrationrailroads.dot.gov
The company is responsible for enforcing rail safety regulations, administering assistance programs, conducting research, and supporting national rail transportation policy |
800 |
| 57 |
Administration for Children and Families (ACF)acf.hhs.gov
Promoting family well-being through proactive strategies to ensure the physical, mental, and social health of children, families, and communities |
793 |
| 58 |
National Archives and Records Administrationarchives.gov
The organization is responsible for preserving and storing significant documents and materials created by the United States Federal government |
778 |
| 59 |
HHS Office of Inspector Generaloig.hhs.gov
The company works to fight waste, fraud, and abuse in HHS programs, with a focus on Medicare, Medicaid, and other healthcare institutions They also provide resources for compliance and public education on fraud prevention |
713 |
| 60 |
U.S. Commodity Futures Trading Commissioncftc.gov
Promotes integrity, resilience, and vibrancy of the U.S. derivatives markets through sound regulation. Guided by commitment, forward-thinking, teamwork, and clarity. |
711 |
| 61 |
Office of Management and Budgetwhitehouse.gov
An organization overseeing the implementation of the US President's vision by assisting in policy, budget, management, regulatory objectives, and statutory responsibilities |
706 |
| 62 |
U.S. Coast Guard Auxiliarycgaux.org
Volunteer organization supporting US Coast Guard missions, providing boating safety education, vessel checks, search & rescue, and other vital services |
704 |
| 63 |
Federal Housing Finance Agencyfhfa.gov
Regulating Fannie Mae, Freddie Mac, and the Federal Home Loan Bank System, FHFA ensures stability in the US housing finance marketplace |
678 |
| 64 |
United States Mintusmint.gov
A national institution manufacturing circulating, precious metal, and collectible coins, along with national medals, while ensuring security over entrusted assets |
667 |
| 65 |
Executive Office of the Presidentwhitehouse.gov
The company supports the President of the United States in governing effectively through various tasks overseen by the White House Chief of Staff |
626 |
| 66 |
Federal Motor Carrier Safety Administrationfmcsa.dot.gov
The company works to prevent crashes involving large trucks and buses by developing regulations, enforcing safety measures, and partnering with stakeholders |
617 |
| 67 |
Financial Crimes Enforcement Network, US Treasuryfincen.gov
The company is a US Treasury bureau focused on preventing financial crimes Learn more at their official website |
586 |
| 68 |
Interior Business Centerdoi.gov
A federal shared services provider offering Acquisition, Financial Management, and Human Resources systems and services to over 150 federal organizations for 30+ years |
582 |
| 69 |
Federal Transit Administrationtransit.dot.gov
The company partners with state and local governments to improve public transportation systems, invests in transit services, oversees safety measures, and promotes economic vitality |
567 |
| 70 |
USDA-Agricultural Marketing Serviceams.usda.gov
The Agricultural Marketing Service administers programs to create marketing opportunities for US producers, ensure food quality, and support economic development in agriculture |
514 |
| 71 |
HHS Careershhs.gov
This company works towards eradicating diseases like HIV/AIDS and Malaria, providing healthcare to underserved communities, and ensuring food and drugs safety |
455 |
| 72 |
USDA National Institute of Food and Agriculturenifa.usda.gov
This organization leads agricultural research, education, and extension efforts to address societal challenges related to agriculture, food, environment, and communities |
450 |
| 73 |
Bureau of Ocean Energy Managementboem.gov
Management of offshore natural gas, oil, minerals, and renewable energy resources on the outer continental shelf across the U.S. |
449 |
| 74 |
United States Senate Sergeant at Armssenate.gov
Provides operational, security, and protocol support services to the United States Senate, ensuring smooth and secure legislative functions. |
442 |
| 75 |
Superior Court of the District of Columbiadccourts.gov
The Superior Court of the District of Columbia is a trusted institution providing justice for all residents since 1970 |
436 |
| 76 |
Taxpayer Advocate Servicetaxpayeradvocate.irs.gov
An independent organization within the IRS that helps taxpayers resolve tax problems, understand their rights, and recommend preventive changes |
407 |
| 77 |
Bureau of Safety and Environmental Enforcementbsee.gov
Regulation and enforcement of offshore oil, gas, and renewable energy activities focusing on safety, environmental protection, and resource conservation. |
391 |
| 78 |
Corporation for National and Community Serviceamericorps.gov
AmeriCorps brings people together to tackle pressing challenges through national service and volunteering, promoting service as a cornerstone of national culture |
377 |
| 79 |
USDA Farm Production and Conservation Business Centerfarmers.gov
Agricultural agency providing crop insurance, conservation programs, technical assistance, commodity/lending services, and disaster programs to farmers and ranchers nationwide |
375 |
| 80 |
U.S. Economic Development Administrationeda.gov
A bureau within the US Department of Commerce that promotes innovation, competitiveness, job growth, and business expansion in regional areas |
360 |
| 81 |
National Cemetery Administrationcem.va.gov
Provide information on burials, headstones/markers, State Cemetery Grants, and presidential memorial certificates for veterans Contact National Cemetery Administration for assistance |
345 |
| 82 |
Embassy of Ireland, USAlinktr.ee
This company promotes and protects Irish interests in the USA, supports economic growth and jobs in Ireland, and provides consular services to Irish citizens |
343 |
| 83 |
National Institute for Occupational Safety and Healthcdc.gov
A research agency under CDC, NIOSH focuses on studying worker safety and health to promote safe workplaces and protect human resources |
332 |
| 84 |
National Academy of Public Administrationnapawash.org
A non-profit organization of public management leaders dedicated to addressing the nation's most critical challenges since 1967 |
327 |
| 85 |
Congressional Budget Officecbo.gov
Provides objective, impartial analyses of budgetary and economic issues to support the Congressional budget process without policy recommendations. |
321 |
| 86 |
TDB Communications, Inc.tdbgov.com
A SDVOSB providing high-quality services accredited by the VA, with a focus on hiring veterans and prioritizing excellence and accountability |
314 |
| 87 |
Department of Energy & Environment (DOEE)doee.dc.gov
Leading authority in energy and environmental issues in DC, administering programs, permits, funding, and education to promote sustainable urban environment |
312 |
| 88 |
U.S. Department of Housing and Urban Development Office of Inspector Generalhudoig.gov
The company works to ensure integrity in HUD operations by reporting and investigating fraud, waste, abuse, and mismanagement in HUD programs |
296 |
| 89 |
U.S. Energy Information Administrationeia.gov
The company is a statistical and analytical agency that collects, analyzes, and disseminates independent energy information to promote sound policy making and public understanding |
222 |
| 90 |
DC Department of Employment Servicesdoes.dc.gov
The company provides employment services to support workforce competitiveness, full employment, lifelong learning, economic stability, and quality of life for residents |
190 |
| 91 |
Department of Homeland Security Office of the Chief Financial Officerdhs.gov
This site provides information on Department of Homeland Security financial management job opportunities for various offices within the organization |
185 |
| 92 |
Embassy of Spain in Washington, D.C.exteriores.gob.es
Official representation of the Government of Spain in the United States, located in Washington, DC as the Embassy of Spain |
181 |
| 93 |
HHS Administration for Strategic Preparedness and Responseaspr.hhs.gov
The company leads national efforts in medical and public health preparedness, response, and recovery from disasters and public health emergencies |
176 |
| 94 |
U.S. Department of Homeland Security, Office of Intelligence and Analysis, Private Sector Engagementdhs.gov
Facilitating private sector critical infrastructure owners and operators with intelligence to meet mission requirements and support decision-making Follow for updates |
173 |
| 95 |
Air Force Acquisitionafacquisitioncareers.com
Experts in air, space, and cyberspace, managing the acquisition process for weapons, systems, supplies, and services to meet DoD needs |
167 |
| 96 |
U.S. Copyright Officecopyright.gov
The company administers US copyright law by examining works for registration, recording ownership transfers, providing information and education, and conducting legal studies |
156 |
| 97 |
Interior Office of Inspector Generaldoioig.gov
The organization conducts independent oversight to ensure accountability and integrity in the US Department of the Interior's programs and operations |
156 |
| 98 |
National Endowment for the Humanitiesneh.gov
A federal agency promoting excellence in the humanities, fostering democracy by funding programs and conveying lessons of history to Americans |
151 |
| 99 |
Treasury Inspector General for Tax Administration (TIGTA)tigta.gov
Provides leadership and coordination to promote efficiency, prevent fraud, and ensure effective administration of internal revenue laws and IRS operations. |
147 |
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.
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 9, 2026.
More company lists in Washington
- The largest companies in Washington 1,082
- Non-profit Organizations companies in Washington 143
- Financial Services companies in Washington 38
- SaaS companies in Washington 37
- Higher Education companies in Washington 35
- IT Services and IT Consulting companies in Washington 35
- Law Practice companies in Washington 34
- Hospitals and Health Care companies in Washington 33
- Business Consulting and Services companies in Washington 32
- International Affairs companies in Washington 28