# The 30 largest companies with in-house R&D in Washington

Tamtam tracks 41 companies with in-house R&D headquartered in Washington. This list ranks the 30 largest by number of employees on LinkedIn, led by Danaher Corporation, NASA - National Aeronautics and Space Administration and USDA. Their median headcount is 1,701. Half of them were founded in 1948 or later.

This selection of companies with in-house R&D in Washington predominantly features large governmental organizations, higher education institutions, and significant players in medical and environmental sectors. Notable entities include NASA, a pioneering organization in space exploration and scientific discovery, and the USDA, a federal department developing policies on farming, agriculture, and food. Xylem, a global provider of water and wastewater management technologies, and Danaher Corporation, an innovator in life sciences and diagnostics, also appear.

A significant pattern observed is the strong presence of U.S. federal government agencies and related institutions, indicating a concentration of public sector-driven research and development. This includes organizations like the US Environmental Protection Agency (EPA) and the National Nuclear Security Administration (NNSA), alongside prominent universities such as The George Washington University and Howard University.

🇺🇸 Washington · 30 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Danaher Corporation](https://www.tamtam.ai/c/danaher-corporation) (danaher.com)<br>Global life sciences and diagnostics innovator accelerating science and technology to improve human health, partnering with customers to advance life-changing science. | Medical Equipment Manufacturing | 🇺🇸 Washington | 53,252 | 1984 |
| 2 | [NASA - National Aeronautics and Space Administration](https://www.tamtam.ai/c/nasa-national-aeronautics-and-space-administration) (nasa.gov)<br>A pioneering organization pushing the boundaries of space exploration, scientific discovery, and aeronautics research to benefit humanity and improve life on Earth | Aviation and Aerospace Component Manufacturing | 🇺🇸 Washington | 50,817 | 1958 |
| 3 | [USDA](https://www.tamtam.ai/c/usda) (usda.gov)<br>A federal executive department that develops and executes government policies on farming, agriculture, and food to support farmers, promote trade, ensure food safety, and protect resources | Government Administration | 🇺🇸 Washington | 23,229 |  |
| 4 | [Xylem](https://www.tamtam.ai/c/xylem) (xylem.com)<br>Global provider of advanced technologies and services focused on water and wastewater management, conservation, reuse, and environmental return. | Industrial Machinery Manufacturing | 🇺🇸 Washington | 19,290 |  |
| 5 | [U.S. Environmental Protection Agency- Pacific Southwest](https://www.tamtam.ai/c/us-environmental-protection-agency-epa) (epa.gov)<br>It protects human health and the environment by ensuring clean air, land, and water while enforcing federal environmental laws effectively. | Government Administration | 🇺🇸 Washington | 16,000 | 1970 |
| 6 | [The George Washington University](https://www.tamtam.ai/c/the-george-washington-university) (gwu.edu)<br>Independent university offering diverse undergraduate, graduate, and professional programs focused on research, teaching, and community engagement in Washington, D.C. | Higher Education | 🇺🇸 Washington | 11,606 | 1821 |
| 7 | [NOAA: National Oceanic & Atmospheric Administration](https://www.tamtam.ai/c/noaa-national-oceanic-and-atmospheric-administration) (noaa.gov)<br>NOAA provides daily weather forecasts, climate monitoring, fisheries management, and marine commerce support, using cutting-edge research and technology | Government Administration | 🇺🇸 Washington | 11,487 |  |
| 8 | [International Monetary Fund](https://www.tamtam.ai/c/international-monetary-fund) (imf.org)<br>The company promotes global economic health by ensuring monetary system stability, providing advice, financing, and training to countries worldwide | International Trade and Development | 🇺🇸 Washington | 7,845 | 1945 |
| 9 | [Howard University](https://www.tamtam.ai/c/howard-university) (howard.edu)<br>A culturally diverse, research-intensive university providing exceptional education at undergraduate, graduate, and professional levels with a focus on Black students and global leadership | Higher Education | 🇺🇸 Washington | 7,777 | 1867 |
| 10 | [Smithsonian Institution](https://www.tamtam.ai/c/smithsonian-institution) (si.edu)<br>The world's largest museum, education, and research complex fostering a community of learning and discovery for all Legal: [link] | Museums, Historical Sites, and Zoos | 🇺🇸 Washington | 6,665 |  |
| 11 | [MedStar Georgetown University Hospital](https://www.tamtam.ai/c/medstar-georgetown-university-hospital) (medstarhealth.org)<br>A leading not-for-profit hospital in DC offering innovative medical treatments, research, and compassionate care in various specialties like neurosciences and cancer | Hospitals and Health Care | 🇺🇸 Washington | 4,215 | 1898 |
| 12 | [USEPA](https://www.tamtam.ai/c/usepa) (epa.gov)<br>The company addresses environmental issues in the United States and abroad through regulation, enforcement, research, setting standards, and international coordination | Environmental Services | 🇺🇸 Washington | 4,180 | 1970 |
| 13 | [U.S. Naval Research Laboratory](https://www.tamtam.ai/c/u-s-naval-research-laboratory) (nrl.navy.mil)<br>Conducts scientific research with applications for the Department of the Navy, the Defense Department and the nation, driving innovative advances for the U.S. Navy and Marine Corps. | Research Services | 🇺🇸 Washington | 3,372 | 1923 |
| 14 | [Naval Surface Warfare Center (NSWC)](https://www.tamtam.ai/c/naval-surface-warfare-center-nswc) (navsea.navy.mil)<br>The NAVSEA Warfare Centers deliver innovative technical solutions for the US Navy, focusing on undersea and surface warfare capabilities | Defense and Space Manufacturing | 🇺🇸 Washington | 2,707 | 1992 |
| 15 | [National Nuclear Security Administration (NNSA)](https://www.tamtam.ai/c/national-nuclear-security-administration-nnsa) (energy.gov)<br>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 | Government Administration | 🇺🇸 Washington | 1,701 | 2000 |
| 16 | [Great Minds](https://www.tamtam.ai/c/great-minds) (greatminds.org)<br>A company founded by education leaders in 2007 to provide knowledge-rich instructional materials for math, English language arts, and science education | Education | 🇺🇸 Washington | 1,344 | 2007 |
| 17 | [Juul Labs](https://www.tamtam.ai/c/juul-labs) (juullabs.com)<br>Development and provision of vapor-based nicotine products designed to help adult smokers transition away from combustible cigarettes safely. | Manufacturing | 🇺🇸 Washington | 1,181 |  |
| 18 | [Xometry](https://www.tamtam.ai/c/xometry) (xometry.com)<br>Leading AI-enabled marketplace for on-demand manufacturing connecting buyers with high-quality parts and assemblies from a network of manufacturing facilities | Software Development | 🇺🇸 Washington | 1,149 | 2013 |
| 19 | [United States Department of the Air Force](https://www.tamtam.ai/c/united-states-department-of-the-air-force) (af.mil)<br>This company is one of the three Military Departments in the US Department of Defense, encompassing the USAF and USSF | Military | 🇺🇸 Washington | 840 | 1947 |
| 20 | [Metrea](https://www.tamtam.ai/c/metrea) (metrea.aero)<br>Provider of defense capabilities and services, specializing in innovative solutions for various missions including ISR, electromagnetic technologies, and simulations applications | Defense and Space Manufacturing | 🇺🇸 Washington | 767 | 2016 |
| 21 | [The GW Medical Faculty Associates](https://www.tamtam.ai/c/the-gw-medical-faculty-associates) (gwdocs.com)<br>A leading medical group with over 700 providers across 50 specialties, committed to comprehensive patient care, healthcare education, and advancing discovery | Hospitals and Health Care | 🇺🇸 Washington | 747 |  |
| 22 | [Georgetown University Medical Center](https://www.tamtam.ai/c/georgetown-university-medical-center) (gumc.georgetown.edu)<br>An internationally recognized academic medical center focused on research, teaching, and patient care with a commitment to community outreach and holistic healthcare | Higher Education | 🇺🇸 Washington | 739 | 1789 |
| 23 | [Vanda Pharmaceuticals](https://www.tamtam.ai/c/vanda-pharmaceuticals) (vandapharma.com)<br>Development and commercialization of innovative therapies targeting high unmet medical needs to improve patient lives worldwide. | Pharmaceutical Manufacturing | 🇺🇸 Washington | 620 | 2003 |
| 24 | [The George Washington University- Milken Institute School of Public Health](https://www.tamtam.ai/c/the-george-washington-university-milken-institute-school-of-public-health) (publichealth.gwu.edu)<br>Promoting public health in the nation's capital through education, advocacy, and research to create a healthier future for all | Higher Education | 🇺🇸 Washington | 571 |  |
| 25 | [MedStar National Rehabilitation Hospital](https://www.tamtam.ai/c/medstar-national-rehabilitation-hospital) (medstarhealth.org)<br>A regional rehabilitation network in Washington, DC, Maryland, and Northern Virginia, offering inpatient, day treatment, and outpatient services for various neurologic and orthopedic conditions | Hospitals and Health Care | 🇺🇸 Washington | 528 |  |
| 26 | [Carnegie Science](https://www.tamtam.ai/c/carnegie-science) (carnegiescience.edu)<br>A prestigious research organization focused on various scientific fields including plant biology, astronomy, Earth science, global ecology, and developmental biology | Research Services | 🇺🇸 Washington | 452 | 1902 |
| 27 | [Naval Reactors](https://www.tamtam.ai/c/naval-reactors) (energy.gov)<br>Develops and maintains nuclear propulsion plants for the US Navy, ensuring safe and reliable operations through rigorous design practices and operating procedures | Armed Forces | 🇺🇸 Washington | 426 | 1948 |
| 28 | [US Geological Survey](https://www.tamtam.ai/c/us-geological-survey) (usgs.gov)<br>Provider of authoritative scientific information and research on Earth, natural resources, environmental issues, and natural hazards at the federal level | Research Services | 🇺🇸 Washington | 393 |  |
| 29 | [Smithsonian National Museum of Natural History](https://www.tamtam.ai/c/smithsonian-national-museum-of-natural-history) (naturalhistory.si.edu)<br>A renowned museum dedicated to inspiring curiosity and learning about the natural world through research, collections, exhibitions, and education programs | Museums, Historical Sites, and Zoos | 🇺🇸 Washington | 370 | 1910 |
| 30 | [GEICO Tech](https://www.tamtam.ai/c/geico-tech) (geico.jobs)<br>A leading auto insurer in the US with a focus on innovation, diversity, and career growth opportunities for women in IT | Insurance | 🇺🇸 Washington | 334 | 1936 |

## 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 Nov 11, 2026.

## More company lists in Washington

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- [Law firms in Washington](https://www.tamtam.ai/l/law-firms-washington) (41)
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- [Companies with a mobile app in Washington](https://www.tamtam.ai/l/companies-with-mobile-app-washington) (36)
- [Healthcare providers in Washington](https://www.tamtam.ai/l/healthcare-providers-washington) (36)
- [Higher Education companies in Washington](https://www.tamtam.ai/l/higher-education-companies-washington) (36)
- [Law Practice companies in Washington](https://www.tamtam.ai/l/law-practice-companies-washington) (36)

## The same list elsewhere in United States

- [Companies with in-house R&D in the United States](https://www.tamtam.ai/l/r-and-d-companies-united-states) (6,796)
- [Companies with in-house R&D in California](https://www.tamtam.ai/l/r-and-d-companies-california) (1,276)
- [Companies with in-house R&D in Texas](https://www.tamtam.ai/l/r-and-d-companies-texas) (442)
- [Companies with in-house R&D in New York State](https://www.tamtam.ai/l/r-and-d-companies-new-york-state) (419)
- [Companies with in-house R&D in Massachusetts](https://www.tamtam.ai/l/r-and-d-companies-massachusetts) (396)
- [Companies with in-house R&D in Illinois](https://www.tamtam.ai/l/r-and-d-companies-illinois) (322)
- [Companies with in-house R&D in Michigan](https://www.tamtam.ai/l/r-and-d-companies-michigan) (287)
- [Companies with in-house R&D in Ohio](https://www.tamtam.ai/l/r-and-d-companies-ohio) (277)
- [Companies with in-house R&D in Pennsylvania](https://www.tamtam.ai/l/r-and-d-companies-pennsylvania) (255)
- [Companies with in-house R&D in New Jersey](https://www.tamtam.ai/l/r-and-d-companies-new-jersey) (224)
- [Companies with in-house R&D in Florida](https://www.tamtam.ai/l/r-and-d-companies-florida) (221)
- [Companies with in-house R&D in Alabama](https://www.tamtam.ai/l/r-and-d-companies-alabama) (214)
- [Companies with in-house R&D in Georgia](https://www.tamtam.ai/l/r-and-d-companies-georgia) (173)
- [Companies with in-house R&D in Virginia](https://www.tamtam.ai/l/r-and-d-companies-virginia) (166)
- [Companies with in-house R&D in North Carolina](https://www.tamtam.ai/l/r-and-d-companies-north-carolina) (158)
- [Companies with in-house R&D in Wisconsin](https://www.tamtam.ai/l/r-and-d-companies-wisconsin) (154)
- [Companies with in-house R&D in Minnesota](https://www.tamtam.ai/l/r-and-d-companies-minnesota) (146)
- [Companies with in-house R&D in Washington State](https://www.tamtam.ai/l/r-and-d-companies-washington-state) (140)
- [Companies with in-house R&D in Colorado](https://www.tamtam.ai/l/r-and-d-companies-colorado) (113)
- [Companies with in-house R&D in Maryland](https://www.tamtam.ai/l/r-and-d-companies-maryland) (107)
- [Companies with in-house R&D in Indiana](https://www.tamtam.ai/l/r-and-d-companies-indiana) (104)
- [Companies with in-house R&D in New York](https://www.tamtam.ai/l/r-and-d-companies-new-york) (223)
- [Companies with in-house R&D in San Francisco](https://www.tamtam.ai/l/r-and-d-companies-san-francisco) (147)
- [Companies with in-house R&D in Houston](https://www.tamtam.ai/l/r-and-d-companies-houston) (129)

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Source: https://www.tamtam.ai/l/r-and-d-companies-washington