There is no single official answer to how many federal government agencies there are, but the most commonly cited figures fall between 73 and 445. The narrower count includes the 15 Cabinet departments plus 58 independent establishments and government corporations listed in the U.S. Government Manual. The broader count reflects the 445 organizations indexed by the Federal Register as having published federal rules. Both are correct — they measure different things.
Why the Number Varies
Federal law does not keep a master list of agencies. Different statutes define the word “agency” differently depending on their purpose. Under the Administrative Procedure Act, the term covers every authority of the federal government except Congress, the federal courts, territorial governments, and the D.C. government. That sweeps in everything from the Department of Defense down to a small advisory board.
For public-records purposes under the Freedom of Information Act, the definition stretches further to cover some bodies that are otherwise excluded. So an entity might not count as an agency for rulemaking but still has to hand over documents when the public asks. The answer to “how many agencies exist” changes with the question you are asking.
The 15 Executive Departments
At the top of the chart sit fifteen executive departments, each led by a Cabinet-level official nominated by the President and confirmed by the Senate:
- State
- Treasury
- Defense
- Justice
- Interior
- Agriculture
- Commerce
- Labor
- Health and Human Services
- Housing and Urban Development
- Transportation
- Energy
- Education
- Veterans Affairs
- Homeland Security
Fourteen are headed by a Secretary; Justice is led by the Attorney General. Together these departments employ the majority of the federal civilian workforce and account for most annual federal spending.
Independent Agencies and Government Corporations
Beyond the Cabinet, Congress has created dozens of freestanding organizations that report to no department head. The 2025 edition of the U.S. Government Manual identifies 58 of these independent establishments and government corporations. They range from NASA and the Environmental Protection Agency to the Nuclear Regulatory Commission.
Many independent regulatory commissions are structured to resist political pressure. The Federal Communications Commission runs on five commissioners, and no more than three can belong to the same political party. The Supreme Court reinforced that independence in Humphrey’s Executor v. United States, holding that Congress can restrict the President’s power to fire commissioners of agencies performing quasi-legislative or quasi-judicial functions. Commissioners of these bodies can typically be removed only for inefficiency, neglect of duty, or misconduct.
Government corporations sit in a separate niche. The United States Postal Service and the National Railroad Passenger Corporation (Amtrak) deliver services that resemble private-sector operations while remaining under federal authority. Several other agencies, including the Patent and Trademark Office and U.S. Citizenship and Immigration Services, fund substantial portions of their work through user fees rather than tax dollars.
Why the Count Climbs Into the Hundreds
Each Cabinet department contains its own constellation of bureaus, offices, and administrations. Some are more recognizable than their parents. The FBI operates within the Department of Justice with its own director, budget, and public identity. The Internal Revenue Service is a bureau of the Treasury Department, the largest one, with its own legal authorities rooted in the Internal Revenue Code. The Federal Aviation Administration sits inside the Department of Transportation.
This is the single biggest driver of the counting problem. Count only Cabinet departments and independent agencies and you land at roughly 73 organizations. Include internal bureaus with their own statutory authority and the number climbs past 200. Include every named office, service, and administration and you approach the Federal Register’s 445.
The Three Official Counts
The most commonly cited tallies come from three government sources, and they reach very different numbers because they answer different questions.
- The Federal Register lists 445 entities that have legal authority to publish federal rules. This is the most inclusive official count, and it sweeps in defunct agencies whose past documents still need to be indexed, along with small sub-units most people would not think of as standalone agencies.
- The U.S. Government Manual identifies 58 independent establishments and government corporations alongside the 15 executive departments. This more conservative count focuses on major organizational units and is the closest thing to a curated list of “real” agencies.
- The Administrative Conference of the United States has studied varying agency counts based on different statutory definitions. Researchers using narrow criteria sometimes cite roughly 60 major independent and executive units; those using broader criteria arrive at numbers well above 400.
None of these counts is wrong. The Federal Register asks who has ever published a rule. The Government Manual asks what the major organizational units are. ACUS asks what qualifies as an agency under a given statute.
What Usually Is Not Counted
Federal advisory committees are a separate category. The General Services Administration reports roughly 1,000 advisory committees operating across the executive branch. They cannot issue rules or enforce laws, so they are not agencies in the traditional sense, though they are formally established government bodies with budgets and staff.
Some entities defy classification altogether. The Smithsonian Institution receives federal appropriations and sits on federal land but has historically described itself not as a government agency but as “a charitable trust for the benefit of humankind whose trustee is the United States.” Chief Justice Taft, when serving as Chancellor of the Smithsonian’s Board of Regents, stated that it “is not, and never has been considered a government bureau.” The Department of Justice has called the Smithsonian “a historical and legal anomaly” and “sui generis.” Government-sponsored enterprises like Fannie Mae, federally funded research and development corporations, and congressionally chartered nonprofits fall into similar gray zones.
How Agencies Are Created and Eliminated
Congress creates federal agencies through enabling legislation, drawing on its enumerated powers and the Necessary and Proper Clause. When Congress establishes a new agency, it defines the body’s functions, jurisdiction, leadership structure, and funding. If the agency’s leaders are principal officers, the Constitution requires presidential nomination and Senate confirmation.
Eliminating an agency Congress created by statute generally requires another act of Congress. The President can reorganize operations, reassign functions, and reduce staffing, but dissolving a statutorily mandated body without legislation raises legal obstacles. Some agencies started as divisions within larger departments and later became independent through specific legislation. The Social Security Administration was part of the Department of Health and Human Services until the Social Security Independence and Program Improvements Act of 1994 made it a standalone agency.
This dynamic means the total tends to grow. Congress creates new bodies in response to emerging needs — the Department of Homeland Security did not exist before 2002 — but rarely goes back to formally dissolve old ones. Some entities become functionally inactive while remaining on the books, which is part of why the Federal Register’s roster is so much longer than the Government Manual’s.
Restructuring in 2025 and 2026
In January 2025, the President signed an executive order establishing the “Department of Government Efficiency” initiative, followed by a February 2025 directive requiring each agency head to identify whether the agency or any of its subcomponents should be eliminated or consolidated. That directive also mandated large-scale reductions in force across offices performing functions not required by statute, and imposed a hiring ratio of no more than one new employee for every four who depart.
Several agencies have been targeted for elimination or major restructuring, including proposals to close USAID and the Consumer Financial Protection Bureau, and an executive order calling for the elimination of the Department of Education. The Social Security Administration and the Department of Agriculture have announced plans to close regional offices and reduce their physical footprint. Courts have blocked or paused some of these efforts where agencies were created by statute, reinforcing that Congress controls whether a statutorily established agency continues to exist.
Whether the total count drops depends on whether Congress passes legislation to formally dissolve any of these bodies. Even when an agency is restructured or absorbed, its functions often survive under a different organizational label.