From https://www.usa.gov/federal-agencies

[This list needs to be cleaned up. The USA.gov website has some agencies listed twice.]

  1. AbilityOne Commission
  2. Access Board
  3. Administration for Children and Families (ACF)
  4. Administration for Community Living
  5. Administration for Native Americans
  6. Administration on Aging
  7. Administration on Intellectual and Developmental Disabilities
  8. Administrative Conference of the United States
  9. Administrative Office of the U.S. Courts
  10. Advisory Council on Historic Preservation
  11. African Development Foundation
  12. Agency for Healthcare Research and Quality (AHRQ)
  13. Agency for International Development (USAID)
  14. Agency for Toxic Substances and Disease Registry
  15. Agricultural Marketing Service (AMS)
  16. Agricultural Research Service
  17. Agriculture Department (USDA)
  18. Air Force
  19. Air Force Reserve
  20. Alcohol and Tobacco Tax and Trade Bureau
  21. Alcohol, Tobacco, Firearms and Explosives Bureau (ATF)
  22. Alhurra TV
  23. American Battle Monuments Commission
  24. American Samoa
  25. AmeriCorps
  26. Amtrak (AMTRAK)
  27. Animal and Plant Health Inspection Service (APHIS)
  28. Antitrust Division
  29. Architect of the Capitol
  30. Archives, National Archives and Records Administration (NARA)
  31. Arctic Research Commission
  32. Armed Forces Retirement Home
  33. Arms Control and International Security
  34. Army
  35. Army Corps of Engineers
  36. Arthritis, Musculoskeletal and Skin Diseases, National Institute of
  37. Bankruptcy Courts
  38. Barry M. Goldwater Scholarship and Excellence in Education Program
  39. Bonneville Power Administration
  40. Botanic Garden
  41. Broadcasting Board of Governors
  42. Bureau of Alcohol and Tobacco Tax and Trade
  43. Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF)
  44. Bureau of Consular Affairs
  45. Bureau of Consumer Financial Protection
  46. Bureau of Economic Analysis (BEA)
  47. Bureau of Engraving and Printing (BEP)
  48. Bureau of Indian Affairs
  49. Bureau of Industry and Security (BIS)
  50. Bureau of International Labor Affairs
  51. Bureau of Justice Statistics
  52. Bureau of Labor Statistics
  53. Bureau of Land Management (BLM)
  54. Bureau of Ocean Energy Management
  55. Bureau of Prisons (BOP)
  56. Bureau of Reclamation
  57. Bureau of Safety and Environmental Enforcement
  58. Bureau of the Census
  59. Bureau of the Fiscal Service
  60. Bureau of Transportation Statistics
  61. Capitol Police
  62. Capitol Visitor Center
  63. Career, Technical, and Adult Education, Office of
  64. Census Bureau
  65. Center for Food Safety and Applied Nutrition
  66. Center for Nutrition Policy and Promotion (CNPP)
  67. Centers for Disease Control and Prevention (CDC)
  68. Centers for Medicare and Medicaid Services (CMS)
  69. Central Command (CENTCOM)
  70. Central Intelligence Agency (CIA)
  71. Chemical Safety Board
  72. Chief Acquisition Officers Council
  73. Chief Financial Officers Council
  74. Chief Human Capital Officers Council
  75. Chief Information Officers Council
  76. Child Support Enforcement, Office of (OCSE)
  77. Citizens’ Stamp Advisory Committee
  78. Citizenship and Immigration Services (USCIS)
  79. Civil Rights, Department of Education Office of
  80. Civil Rights, Department of Health and Human Services Office for
  81. Coast Guard
  82. Commerce Department (DOC)
  83. Commission of Fine Arts
  84. Commission on Civil Rights
  85. Commission on International Religious Freedom
  86. Commission on Presidential Scholars
  87. Commission on Security and Cooperation in Europe (Helsinki Commission)
  88. Committee for the Implementation of Textile Agreements
  89. Committee on Foreign Investment in the United States
  90. Commodity Futures Trading Commission (CFTC)
  91. Community Oriented Policing Services (COPS)
  92. Community Planning and Development
  93. Compliance, Office of
  94. Comptroller of the Currency, Office of (OCC)
  95. Computer Emergency Readiness Team (US CERT)
  96. Congress—U.S. House of Representatives
  97. Congress—U.S. Senate
  98. Congressional Budget Office (CBO)
  99. Congressional Research Service
  100. Consular Affairs, Bureau of
  101. Consumer Financial Protection Bureau
  102. Consumer Product Safety Commission (CPSC)
  103. Coordinating Council on Juvenile Justice and Delinquency Prevention
  104. Copyright Office
  105. Corporation for National and Community Service
  106. Corps of Engineers
  107. Council of Economic Advisers
  108. Council of the Inspectors General on Integrity and Efficiency
  109. Council on Environmental Quality
  110. Court of Appeals for the Armed Forces
  111. Court of Appeals for the Federal Circuit
  112. Court of Appeals for Veterans Claims
  113. Court of Federal Claims
  114. Court of International Trade
  115. Court Services and Offender Supervision Agency for the District of Columbia
  116. Customs and Border Protection
  117. Defense Acquisition University
  118. Defense Advanced Research Projects Agency (DARPA)
  119. Defense Commissary Agency
  120. Defense Contract Audit Agency
  121. Defense Contract Management Agency
  122. Defense Department (DOD)
  123. Defense Finance and Accounting Service (DFAS)
  124. Defense Finance and Accounting Service Out-of-Service Debt Mgmt. Center
  125. Defense Health Agency
  126. Defense Information Systems Agency (DISA)
  127. Defense Intelligence Agency (DIA)
  128. Defense Logistics Agency (DLA)
  129. Defense Nuclear Facilities Safety Board
  130. Defense Security Cooperation Agency (DSCA)
  131. Defense Security Service
  132. Defense Technical Information Center (DTIC)
  133. Defense Threat Reduction Agency (DTRA)
  134. Delaware River Basin Commission
  135. Denali Commission
  136. Department of Agriculture (USDA)
  137. Department of Commerce (DOC)
  138. Department of Defense (DOD)
  139. Department of Education (ED)
  140. Department of Energy (DOE)
  141. Department of Health and Human Services (HHS)
  142. Department of Homeland Security (DHS)
  143. Department of Justice (DOJ)
  144. Department of Labor (DOL)
  145. Department of State (DOS)
  146. Department of the Interior (DOI)
  147. Department of the Treasury
  148. Department of Transportation (DOT)
  149. Department of Veterans Affairs (VA)
  150. Director of National Intelligence, Office of
  151. Disability Employment Policy, Office of (ODEP)
  152. Domestic Policy Council
  153. Drug Enforcement Administration (DEA)
  154. Dwight D. Eisenhower School for National Security and Resource Strategy
  155. Economic Adjustment Office
  156. Economic Analysis, Bureau of (BEA)
  157. Economic Development Administration (EDA)
  158. Economic Growth, Energy, and the Environment
  159. Economic Research Service
  160. Economics and Statistics Administration
  161. Education Department (ED)
  162. Education Resources Information Center (ERIC)
  163. Elder Justice Initiative
  164. Election Assistance Commission (EAC)
  165. Elementary and Secondary Education, Office of
  166. Employee Benefits Security Administration (EBSA)
  167. Employment and Training Administration
  168. Endangered Species Program
  169. Energy Department (DOE)
  170. Energy Information Administration
  171. English Language Acquisition Office
  172. Engraving and Printing, Bureau of (BEP)
  173. Environmental Management
  174. Environmental Protection Agency (EPA)
  175. Equal Employment Opportunity Commission (EEOC)
  176. European Command
  177. Executive Office for Immigration Review
  178. Fair Housing and Equal Opportunity
  179. Fannie Mae
  180. Farm Credit Administration
  181. Farm Credit System Insurance Corporation
  182. Farm Service Agency
  183. Federal Accounting Standards Advisory Board
  184. Federal Aviation Administration (FAA)
  185. Federal Bureau of Investigation (FBI)
  186. Federal Bureau of Prisons (BOP)
  187. Federal Citizen Information Center
  188. Federal Communications Commission (FCC)
  189. Federal Consulting Group
  190. Federal Deposit Insurance Corporation (FDIC)
  191. Federal Election Commission
  192. Federal Emergency Management Agency (FEMA)
  193. Federal Energy Regulatory Commission
  194. Federal Executive Boards
  195. Federal Financial Institutions Examination Council
  196. Federal Financing Bank
  197. Federal Geographic Data Committee
  198. Federal Highway Administration (FHA)
  199. Federal Home Loan Mortgage Corporation (Freddie Mac)
  200. Federal Housing Administration (FHA)
  201. Federal Housing Finance Agency
  202. Federal Interagency Committee on Education
  203. Federal Interagency Council on Statistical Policy
  204. Federal Judicial Center
  205. Federal Labor Relations Authority (FLRA)
  206. Federal Laboratory Consortium for Technology Transfer
  207. Federal Law Enforcement Training Center (FLETC)
  208. Federal Library and Information Center Committee
  209. Federal Maritime Commission
  210. Federal Mediation and Conciliation Service
  211. Federal Mine Safety and Health Review Commission
  212. Federal Motor Carrier Safety Administration (FMCSA)
  213. Federal National Mortgage Association (Fannie Mae)
  214. Federal Protective Service
  215. Federal Railroad Administration (FRA)
  216. Federal Register
  217. Federal Reserve System
  218. Federal Retirement Thrift Investment Board
  219. Federal Student Aid Information Center
  220. Federal Trade Commission (FTC)
  221. Federal Transit Administration (FTA)
  222. Federal Voting Assistance Program
  223. Federated States of Micronesia
  224. FedStats
  225. Fiscal Service, Bureau of the
  226. Fish and Wildlife Service (FWS)
  227. Fleet Forces Command
  228. Food and Agriculture, National Institute of
  229. Food and Drug Administration (FDA)
  230. Food and Nutrition Service
  231. Food Safety and Inspection Service
  232. Foreign Agricultural Service
  233. Foreign Claims Settlement Commission
  234. Forest Service
  235. Fossil Energy
  236. Freddie Mac
  237. Fulbright Foreign Scholarship Board
  238. General Services Administration (GSA)
  239. Geological Survey (USGS)
  240. Ginnie Mae
  241. Government Accountability Office (GAO)
  242. Government Ethics, Office of (OGE)
  243. Government National Mortgage Association (Ginnie Mae)
  244. Government Publishing Office (GPO)
  245. Grain Inspection, Packers and Stockyards Administration
  246. Harry S. Truman Scholarship Foundation
  247. Health and Human Services Department (HHS)
  248. Health Resources and Services Administration
  249. Helsinki Commission
  250. Holocaust Memorial Museum
  251. Homeland Security Department (DHS)
  252. House of Representatives
  253. House Office of Inspector General
  254. House Office of the Clerk
  255. Housing Office
  256. Immigration and Citizenship Services (USCIS)
  257. Immigration and Customs Enforcement (ICE)
  258. Indian Affairs
  259. Indian Arts and Crafts Board
  260. Indian Health Service
  261. Industrial College of the Armed Forces
  262. Industry and Security, Bureau of (BIS)
  263. Information Resource Management College
  264. Information Resources Center (ERIC)
  265. Innovation and Improvement Office
  266. Inspectors General
  267. Institute of Education Sciences
  268. Institute of Museum and Library Services
  269. Institute of Peace
  270. Inter-American Foundation
  271. Interagency Alternative Dispute Resolution Working Group
  272. Interagency Committee for the Management of Noxious and Exotic Weeds
  273. Interagency Council on Homelessness
  274. Interior Department (DOI)
  275. Internal Revenue Service (IRS)
  276. International Labor Affairs, Bureau of
  277. International Trade Administration (ITA)
  278. International Trade Commission
  279. Interpol
  280. James Madison Memorial Fellowship Foundation
  281. Japan-United States Friendship Commission
  282. Job Corps
  283. John F. Kennedy Center for the Performing Arts
  284. Joint Board for the Enrollment of Actuaries
  285. Joint Chiefs of Staff
  286. Joint Congressional Committee on Inaugural Ceremonies
  287. Joint Fire Science Program
  288. Joint Forces Command
  289. Joint Forces Staff College
  290. Joint Military Intelligence College
  291. Joint Program Executive Office for Chemical and Biological Defense
  292. Judicial Circuit Courts of Appeal
  293. Judicial Panel on Multidistrict Litigation
  294. Justice Department (DOJ)
  295. Justice Programs, Office of
  296. Justice Statistics, Bureau of
  297. Juvenile Justice and Delinquency Prevention, Office of
  298. Kennedy Center
  299. Labor Department (DOL)
  300. Labor Statistics, Bureau of
  301. Land Management, Bureau of (BLM)
  302. Legal Services Corporation
  303. Library of Congress (LOC)
  304. Manufactured Housing Programs, Office of
  305. Marine Corps
  306. Marine Mammal Commission
  307. Maritime Administration (MARAD)
  308. Marketing and Regulatory Programs
  309. Marshals Service
  310. Mediation and Conciliation Service
  311. Medicaid (CMS)
  312. Medicaid and CHIP Payment and Access Commission
  313. Medicare (CMS)
  314. Medicare Payment Advisory Commission
  315. Merit Systems Protection Board
  316. Middle East Broadcasting Network
  317. Migratory Bird Conservation Commission
  318. Military Postal Service Agency
  319. Millennium Challenge Corporation
  320. Mine Safety and Health Administration (MSHA)
  321. Minority Business Development Agency
  322. Minority Health, Office of
  323. Mint
  324. Missile Defense Agency (MDA)
  325. Mississippi River Commission
  326. Morris K. Udall and Stewart L. Udall Foundation
  327. Multifamily Housing Office
  328. National Aeronautics and Space Administration (NASA)
  329. National Agricultural Statistics Service
  330. National AIDS Policy Office
  331. National Archives and Records Administration (NARA)
  332. National Cancer Institute (NCI)
  333. National Capital Planning Commission
  334. National Cemetery Administration
  335. National Constitution Center
  336. National Council on Disability
  337. National Credit Union Administration (NCUA)
  338. National Defense University
  339. National Defense University iCollege
  340. National Economic Council
  341. National Endowment for the Arts (NEA)
  342. National Endowment for the Humanities
  343. National Flood Insurance Program (NFIP)
  344. National Gallery of Art
  345. National Geospatial-Intelligence Agency
  346. National Guard
  347. National Health Information Center (NHIC)
  348. National Heart, Lung, and Blood Institute (NHLBI)
  349. National Highway Traffic Safety Administration (NHTSA)
  350. National Indian Gaming Commission
  351. National Institute of Arthritis, Musculoskeletal and Skin Diseases
  352. National Institute of Corrections
  353. National Institute of Food and Agriculture
  354. National Institute of Justice
  355. National Institute of Mental Health (NIMH)
  356. National Institute of Occupational Safety and Health (NIOSH)
  357. National Institute of Standards and Technology (NIST)
  358. National Institutes of Health (NIH)
  359. National Intelligence University
  360. National Interagency Fire Center
  361. National Labor Relations Board (NLRB)
  362. National Laboratories
  363. National Marine Fisheries Service
  364. National Mediation Board
  365. National Nuclear Security Administration
  366. National Ocean Service
  367. National Oceanic and Atmospheric Administration (NOAA)
  368. National Park Foundation
  369. National Park Service (NPS)
  370. National Passport Information Center (NPIC)
  371. National Pesticide Information Center
  372. National Railroad Passenger Corporation (AMTRAK)
  373. National Reconnaissance Office
  374. National Science Foundation (NSF)
  375. National Security Agency (NSA)
  376. National Security Council
  377. National Technical Information Service
  378. National Telecommunications and Information Administration
  379. National Transportation Safety Board (NTSB)
  380. National War College
  381. National Weather Service
  382. Natural Resources Conservation Service
  383. Natural Resources Revenue, Office of
  384. Navy
  385. NOAA Fisheries
  386. Northern Command
  387. Northern Mariana Islands
  388. Northwest Power and Conservation Council
  389. Northwest Power Planning Council
  390. Nuclear Energy, Office of
  391. Nuclear Regulatory Commission (NRC)
  392. Nuclear Waste Technical Review Board
  393. Oak Ridge National Laboratory
  394. Occupational Safety and Health Administration (OSHA)
  395. Occupational Safety and Health Review Commission
  396. Ocean Energy Management, Bureau of
  397. Office for Civil Rights, Department of Education
  398. Office for Civil Rights, Department of Health and Human Services
  399. Office of Career, Technical, and Adult Education
  400. Office of Child Support Enforcement (OCSE)
  401. Office of Community Planning and Development
  402. Office of Compliance
  403. Office of Cuba Broadcasting
  404. Office of Disability Employment Policy (ODEP)
  405. Office of Elementary and Secondary Education
  406. Office of Environmental Management
  407. Office of Fair Housing and Equal Opportunity
  408. Office of Fossil Energy
  409. Office of Government Ethics (OGE)
  410. Office of Housing
  411. Office of Investor Education and Advocacy
  412. Office of Justice Programs
  413. Office of Juvenile Justice and Delinquency Prevention
  414. Office of Lead Hazard Control and Healthy Homes
  415. Office of Management and Budget (OMB)
  416. Office of Manufactured Housing Programs
  417. Office of Minority Health
  418. Office of National Drug Control Policy (ONDCP)
  419. Office of Natural Resources Revenue
  420. Office of Nuclear Energy
  421. Office of Personnel Management (OPM)
  422. Office of Policy Development and Research
  423. Office of Postsecondary Education
  424. Office of Refugee Resettlement
  425. Office of Science and Technology Policy
  426. Office of Scientific and Technical Information
  427. Office of Servicemember Affairs
  428. Office of Special Counsel
  429. Office of Special Education and Rehabilitative Services (OSERS)
  430. Office of Surface Mining, Reclamation and Enforcement
  431. Office of the Comptroller of the Currency (OCC)
  432. Office of the Director of National Intelligence
  433. Office of the Federal Register
  434. Office of the Pardon Attorney
  435. Open World Leadership Center
  436. Out-of-Service Debt Management Center
  437. Overseas Private Investment Corporation
  438. Pacific Command
  439. Pacific Northwest Electric Power and Conservation Planning Council
  440. Pardon Attorney, Office of
  441. Parole Commission
  442. Patent and Trademark Office
  443. Peace Corps
  444. Pension Benefit Guaranty Corporation (PBGC)
  445. Pentagon Force Protection Agency
  446. Pipeline and Hazardous Materials Safety Administration
  447. Policy Development and Research
  448. Political Affairs
  449. Postal Inspection Service
  450. Postal Regulatory Commission
  451. Postal Service (USPS)
  452. Postsecondary Education, Office of
  453. Power Administrations
  454. President’s Council on Fitness, Sports and Nutrition
  455. Presidential Scholars Commission
  456. Presidio Trust
  457. Pretrial Services Agency for the District of Columbia
  458. Prisoner of War/Missing in Action Accounting Agency
  459. Privacy and Civil Liberties Oversight Board (PCLOB)
  460. Public and Indian Housing
  461. Public Diplomacy and Public Affairs
  462. Radio and TV Martí
  463. Radio Free Asia (RFA)
  464. Radio Free Europe and Radio Liberty (RFE/RL)
  465. Radio Sawa
  466. Railroad Retirement Board (RRB)
  467. Reclamation, Bureau of
  468. Refugee Resettlement, Office of
  469. Rehabilitation Services Administration
  470. Research and Innovative Technology Administration
  471. Risk Management Agency
  472. Rural Business and Cooperative Programs
  473. Rural Development
  474. Rural Housing Service
  475. Rural Utilities Service
  476. Safety and Environmental Enforcement, Bureau of
  477. Saint Lawrence Seaway Development Corporation
  478. Science and Technology Policy, Office of
  479. Science Office
  480. Scientific and Technical Information, Office of
  481. Secret Service
  482. Securities and Exchange Commission (SEC)
  483. Selective Service System (SSS)
  484. Senate
  485. Sentencing Commission
  486. Servicemember Affairs, Office of
  487. Small Business Administration (SBA)
  488. Smithsonian Institution
  489. Social Security Administration (SSA)
  490. Social Security Advisory Board
  491. Southeastern Power Administration
  492. Southern Command
  493. Southwestern Power Administration
  494. Special Counsel, Office of
  495. Special Education and Rehabilitative Services, Office of (OSERS)
  496. Special Forces Operations Command
  497. State Department (DOS)
  498. State Justice Institute
  499. Stennis Center for Public Service
  500. Strategic Command
  501. Substance Abuse and Mental Health Services Administration (SAMHSA)
  502. Supreme Court of the United States
  503. Surface Mining, Reclamation and Enforcement, Office of
  504. Surface Transportation Board
  505. Susquehanna River Basin Commission
  506. Tax Court
  507. Taxpayer Advocacy Panel
  508. Tennessee Valley Authority (TVA)
  509. Trade and Development Agency
  510. Trade Representative
  511. Transportation Department (DOT)
  512. Transportation Security Administration (TSA)
  513. Transportation Statistics, Bureau of
  514. Treasury Department
  515. Trustee Program
  516. U.S. AbilityOne Commission
  517. U.S. Access Board
  518. U.S. Agency for International Development (USAID)
  519. U.S. Air Force
  520. U.S. Air Force Reserve Command
  521. U.S. Arctic Research Commission
  522. U.S. Army
  523. U.S. Army Corps of Engineers
  524. U.S. Botanic Garden
  525. U.S. Capitol Police
  526. U.S. Capitol Visitor Center
  527. U.S. Census Bureau
  528. U.S. Central Command (CENTCOM)
  529. U.S. Chemical Safety Board
  530. U.S. Circuit Courts of Appeal
  531. U.S. Citizenship and Immigration Services (USCIS)
  532. U.S. Coast Guard
  533. U.S. Commission of Fine Arts
  534. U.S. Commission on International Religious Freedom
  535. U.S. Commodity Futures Trading Commission (CFTC)
  536. U.S. Court of Appeals for Veterans Claims
  537. U.S. Customs and Border Protection
  538. U.S. Department of Agriculture (USDA)
  539. U.S. Department of Commerce (DOC)
  540. U.S. Department of Defense (DOD)
  541. U.S. Department of Education (ED)
  542. U.S. Department of Energy (DOE)
  543. U.S. Department of Health and Human Services (HHS)
  544. U.S. Department of Homeland Security (DHS)
  545. U.S. Department of Housing and Urban Development (HUD)
  546. U.S. Department of Justice (DOJ)
  547. U.S. Department of Labor (DOL)
  548. U.S. Department of State (DOS)
  549. U.S. Department of the Interior (DOI)
  550. U.S. Department of the Treasury
  551. U.S. Department of Transportation (DOT)
  552. U.S. Department of Veterans Affairs (VA)
  553. U.S. Election Assistance Commission (EAC)
  554. U.S. European Command
  555. U.S. Fleet Forces Command
  556. U.S. Geological Survey (USGS)
  557. U.S. House of Representatives
  558. U.S. Immigration and Customs Enforcement (ICE)
  559. U.S. International Trade Commission
  560. U.S. Marine Corps
  561. U.S. Marshals Service
  562. U.S. Military Academy, West Point
  563. U.S. Mission to the United Nations
  564. U.S. National Central Bureau – Interpol
  565. U.S. Navy
  566. U.S. Northern Command
  567. U.S. Nuclear Regulatory Commission (NRC)
  568. U.S. Pacific Command
  569. U.S. Parole Commission
  570. U.S. Patent and Trademark Office
  571. U.S. Postal Inspection Service
  572. U.S. Postal Service (USPS)
  573. U.S. Senate
  574. U.S. Sentencing Commission
  575. U.S. Southern Command
  576. U.S. Special Operations Command
  577. U.S. Strategic Command
  578. U.S. Trade and Development Agency
  579. U.S. Trade Representative
  580. U.S. Transportation Command
  581. U.S. Trustee Program
  582. Unified Combatant Commands
  583. Uniformed Services University of the Health Sciences
  584. United States Mint
  585. US-CERT (US CERT)
  586. USAGov
  587. Veterans Affairs Department (VA)
  588. Veterans Benefits Administration (VBA)
  589. Veterans Day National Committee
  590. Veterans Health Administration (VHA)
  591. Veterans’ Employment and Training Service (VETS)
  592. Vietnam Education Foundation
  593. Voice of America (VOA)
  594. Washington Headquarters Services
  595. Weather Service
  596. Weights and Measures Division
  597. West Point Military Academy
  598. Western Area Power Administration
  599. White House
  600. White House Office of Administration
  601. Wireless Telecommunications Bureau
  602. Women’s Bureau
  603. Woodrow Wilson International Center for Scholars