A-Z index of U.S. government departments and agencies
Find contact information for U.S. federal government departments and agencies including websites, emails, phone numbers, addresses, and more.
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The National Aeronautics and Space Administration (NASA) explores space, and researches Earth systems, the solar system, and the universe.
Phone number:
1-202-358-0001
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The National Agricultural Library is the main source of information and research on agriculture.
Website:
Phone number:
1-301-504-5755
The Agricultural Statistics Service studies and provides the market with detailed information about U.S. agriculture.
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The National Archives and Records Administration preserves U.S. government records, manages the Presidential Libraries system, and publishes laws, regulations, Presidential, and other public documents.
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The National Cancer Institute conducts and supports research, training, health information distribution, and other programs related to the cause, diagnosis, prevention, and treatment of cancer, rehabilitation from cancer, and the continuing care of cancer patients and the families of cancer patients.
Website:
The National Capital Planning Commission crafts long-range plans and policies for the National Capital Region. The Commission provides building and zoning advice to Washington, DC and the surrounding area, and approves various federal construction plans.
Website:
Phone number:
1-202-482-7200
The National Cemetery Administration provides burial space for Veterans and their eligible family members, and maintains national cemeteries as national shrines, sacred to the honor and memory of those interred or memorialized there.
Website:
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The National Center for Complementary and Integrative Health (NCCIH) conducts and supports research and provides information about complementary health products and practices. It is part of the National Institutes of Health.
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The National Constitution Center is a state-of-the-art museum dedicated to the study of the U.S. Constitution. The museum is also a national hub for constitutional education and outreach.
Website:
Phone number:
1-215-409-6600
The National Council on Disability makes recommendations to the President and Congress on policies affecting Americans with disabilities. They empower individuals with disabilities, and promote equal opportunity.
Website:
Phone number:
1-202-272-2004
The National Credit Union Administration charters and supervises federal credit unions, and insures savings in federal and most state-chartered credit unions.
Website:
Phone number:
1-703-518-6300
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The National Defense University provides educational opportunities for military personnel and civilians.
Website:
Phone number:
1-202-685-2128
The College of Information and Cyberspace (NDU) offers military and civilian learners educational opportunities in the fields of information technology and cyber security.
Phone number:
1-202-685-6300
The National Endowment for the Arts funds, promotes, and strengthens the creative capacity of our communities by providing all Americans with opportunities for arts participation.
Website:
Phone number:
1-202-682-5400
The National Endowment for the Humanities funds humanities programs in the United States such as museums, archives, libraries, colleges, universities, public television, radio stations, and individual scholars.
Phone number:
1-202-606-8400
National Flood Insurance Program provides affordable insurance to property owners and encourages communities to adopt and enforce floodplain management regulations.
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The National Gallery of Art collects, preserves and exhibits art works, and works to promote the understanding of art through research and educational programs.
Website:
Phone number:
1-202-737-4215
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The National Geospatial-Intelligence Agency provides location-based intelligence in support of national security.
Phone number:
1-571-557-5400
The National Guard provides trained units to the states, territories and the District of Columbia to protect life and property. The Guard also provides trained units to defend the United States and its interests all over the globe.
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Contact:
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The National Health Information Center helps connect health professionals and consumers to the organizations that can best answer their questions by providing up-to-date contact information for the most reliable resources.
The National Heart, Lung, and Blood Institute provides training, and education programs to promote the prevention and treatment of heart, lung, and blood diseases to enhance the health of all individuals.
Phone number:
1-301-592-8573
The National Highway Traffic Safety Administration investigates safety defects in motor vehicles, sets and enforces fuel economy standards, helps states and local communities reduce the threat of drunk drivers, promotes the use of safety belts, child safety seats and air bags, investigates odometer fraud, establishes and enforces vehicle anti-theft regulations, conducts research on driver behavior and traffic safety, and provides consumer information on motor vehicle safety topics.
Phone number:
1-202-366-4000 (Department of Transportation Switchboard)
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The National Indian Gaming Commission is a regulatory body that oversees some aspects of gaming on Indian lands, often complementing the work of Indian regulators.
Website:
Phone number:
1-202-632-7003
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The National Institute for Occupational Safety and Health (NIOSH) conducts research and makes recommendations for the prevention of work-related injury and illness.
NIAID provides health information on allergic, infectious, and immunologic diseases. Diseases include food allergy, sinusitis, and genital herpes. Consumers can call or write to the institute with questions and can order publications over the phone or on the Web site.
Phone number:
(301) 496-5717
The National Institute of Arthritis and Musculoskeletal and Skin Diseases supports research into the causes, treatment, and prevention of arthritis, musculoskeletal, and skin diseases.
Phone number:
1-301-495-4484
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The National Institute of Corrections gives training, technical assistance, and information services to federal, state, and local corrections facilities.
Website:
Phone number:
1-202-307-3106
The National Institute of Deafness and Other Communication Disorders supports biomedical and behavioral research on hearing, balance, smell, taste, voice, speech and language.
The National Institute of Diabetes and Digestive and Kidney Diseases supports the research of diabetes, digestive diseases, kidney diseases, and more.
The National Institute of Food and Agriculture is a research and grant-making organization focused on agriculture.
Phone number:
1-202-720-4651
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The National Institute of Justice is dedicated to improving knowledge and understanding of crime and justice issues through science.
Website:
Phone number:
1-202-307-2942
The National Institute of Mental Health conducts and supports research that seeks to understand, treat, and prevent mental illness.
Phone number:
1-301-443-4513
The National Institute of Neurological Disorders and Stroke investigates the causes, prevention, diagnosis and treatment of neurological diseases such as cerebral palsy, Parkinson's disease, multiple sclerosis, autism, and stroke.
The National Institute of Standards and Technology promotes U.S. innovation and industrial competitiveness by advancing measurement science, standards, and technology in ways that enhance economic security and improve our quality of life.
Phone number:
1-301-975-6478
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The National Institutes of Health (NIH) is the primary Federal agency for conducting and supporting medical research.
Website:
Phone number:
1-301-496-4000
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National Intelligence University provides bachelors, masters, and continuing education opportunities to individuals in, or looking to enter, the fields of intelligence.
Website:
Phone number:
1-202-231-3319
The National Interagency Fire Center coordinates the national mobilization of resources for wildland fire and other incidents throughout the United States.
Website:
Phone number:
1-208-387-5512
The National Labor Relations Board enforces the National Labor Relations Act by investigating allegations of wrong-doing brought by workers, unions, or employers, conducting elections, and deciding and resolving cases.
Phone number:
1-202-273-1000
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The National Laboratories conduct scientific research and development in areas related to energy and technology.
Website:
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- Ames Laboratory
- Argonne National Laboratory
- Brookhaven National Laboratory
- Fermi National Accelerator Laboratory
- Frederick National Laboratory for Cancer Research
- Idaho National Laboratory
- Lawrence Berkeley National Laboratory
- Lawrence Livermore National Laboratory
- Los Alamos National Laboratory
- National Energy Technology Laboratory
- National Renewable Energy Laboratory
- Oak Ridge National Laboratory
- Pacific Northwest National Laboratory
- Princeton Plasma Physics Laboratory
- Sandia National Laboratory
- Savannah River National Laboratory
- SLAC National Accelerator Laboratory
- Thomas Jefferson National Accelerator Facility
The National Library of Medicine (NLM) is a leader in research in biomedical informatics and data science and the world’s largest biomedical library. NLM conducts and supports research in methods for recording, storing, retrieving, preserving, and communicating health information. It is part of the National Institutes of Health (NIH).
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NOAA Fisheries, also known as the National Marine Fisheries Service, is responsible for the management, conservation, and protection of living marine resources within about 200 miles of the U.S. coast.
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The National Mediation Board facilitates the resolution of labor-management disputes in the rail and airline industries.
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Phone number:
1-202-692-5050
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The National Nuclear Security Administration works to ensure that the nation's stockpile of nuclear weapons is safe and secure. It also works to ensure the safety of naval nuclear reactors, is the first responder in case of nuclear emergency, and works on worldwide nuclear nonproliferation issues.
Phone number:
1-202-586-5000 (Energy Switchboard)
The National Ocean Service provides data, tools, and services that support coastal economies and their contribution to the national economy.
Website:
Phone number:
1-301-713-3010
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The National Oceanic and Atmospheric Administration (NOAA) works to understand and predict changes in climate, weather, oceans, and coasts. Their work supports severe weather preparedness, and international shipping.
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The National Park Foundation supports America’s national parks through conservation, preservation, education, and community engagement.
Website:
Phone number:
1-202-354-6460
Contact:
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The National Park Service cares for the more than 400 national parks in the United States. The National Park Service partners with local communities to assist in historic preservation and the creation and maintenance of recreational spaces.
Website:
Phone number:
1-202-208-6843 (National Headquarters)
Contact:
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Contact the National Passport Information Center for information on U.S. passports. Check the status of a pending application. Find the locations of more than 4,500 passport acceptance facilities. And learn how to get a passport in an emergency.
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A service that provides objective, science-based information about a wide variety of pesticide-related subjects, including pesticide products, pesticide poisonings, toxicology, and environmental chemistry.
The CDC National Prevention Information Network (NPIN) is the reference and referral service for information on HIV/AIDS, viral hepatitis, sexually transmitted diseases (STDs), and tuberculosis (TB).
Amtrak, the National Railroad Passenger Corporation, provides intercity rail passenger service.
The National Reconnaissance Office is responsible for designing, building, launching, and maintaining intelligence satellites.
Website:
Phone number:
703-808-5050
The National Science Foundation supports research and education across all fields of science and technology, primarily through grants.
Website:
Phone number:
1-703-292-5111
The National Security Agency protects national security systems and information.
Website:
Phone number:
1-301-688-6311
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The National Security Council advises the President on national security and foreign policy.
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The National Technical Information Service provides businesses, universities, and the public access to government-funded scientific, engineering, technical, and business related information.
Phone number:
1-703-605-6050 (Customer Service)
The National Telecommunications and Information Administration manages federal spectrum use, makes grants to develop and deploy broadband internet, conducts telecommunications research, and advises the president on telecommunications and information policy issues.
Phone number:
1-202-482-2000
The National Transportation Safety Board investigates every civil aviation accident in the U.S. and significant accidents in other modes of transportation. Based on their investigative findings and special studies, the board makes recommendations aimed at preventing future accidents.
Phone number:
1-202-314-6000
The National War College educates future leaders of the Armed Forces, State Department, and other civilian agencies through the study of national security strategy.
Website:
Phone number:
1-202-685-3674
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The National Weather Service provides weather, water, and climate forecasts and data.
Website:
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The Natural Resources Conservation Service works with landowners for conservation planning and assistance to foster healthy ecosystems.
Phone number:
1-202-720-4527
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The Office of Natural Resources Revenue manages the revenues from energy and mineral leases for the use of public natural resources on the Outer Continental Shelf and onshore Federal and American Indian lands.
Website:
Phone number:
1-202-513-0600
NOAA Fisheries, also known as the National Marine Fisheries Service, is responsible for the management, conservation, and protection of living marine resources within about 200 miles of the U.S. coast.
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Contact:
The Northern Border Regional Commission is a federal-state partnership for economic, and community development in northern Maine, New Hampshire, Vermont, and New York.
Website:
Phone number:
1-603-369-3001
The Northern Command is responsible for defending the continental United States and Alaska, and for coordinating with the defenses of Canada, Mexico, and the Bahamas.
Website:
Phone number:
1-719-554-6889
Contact:
The Northwest Power and Conservation Council develops energy plans for the pacific northwest that include conservation efforts for local fish and wildlife.
Phone number:
1-503-222-5161
The Northwest Power and Conservation Council develops energy plans for the pacific northwest that include conservation efforts for local fish and wildlife.
Phone number:
1-503-222-5161
The Office of Nuclear Energy works to improve the safety, cost, security, and efficiency of nuclear energy generation.
Phone number:
1-202-586-5000
Contact:
The Nuclear Regulatory Commission regulates commercial nuclear power plants, and other uses of nuclear materials.
Website:
Phone number:
1-301-415-7000
The Nuclear Waste Technical Review Board provides scientific and technical oversight of the Department of Energy's program for managing and disposing of high-level nuclear waste and spent nuclear fuel.
Website:
Phone number:
1-703-235-4473
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