The federal judiciary’s structure is a three-tier Article III system: 94 U.S. district courts at the trial level, 13 U.S. courts of appeals above them, and the Supreme Court at the top, with a set of specialized Article I courts handling defined categories of disputes alongside the main hierarchy. Article III of the Constitution guarantees a Supreme Court and lets Congress build everything beneath it, which is exactly what Congress did starting with the Judiciary Act of 1789.1National Archives. Federal Judiciary Act (1789) The result is a system of roughly 870 authorized Article III judgeships organized to move cases from local trial courtrooms up through appellate review to a single national court of last resort.
The Three Tiers
Cases enter at the bottom and can climb through appeals. Each level does something different.
U.S. District Courts
District courts are the federal trial courts. There are 94 judicial districts, with every state having at least one and larger states having several. Witnesses testify here, evidence comes in, and a judge or jury reaches a verdict. The Federal Rules of Evidence govern what the court will consider, and the Federal Rules of Civil Procedure govern how civil cases move from filing to trial.2United States Courts. Federal Rules of Evidence3United States Courts. Federal Rules of Civil Procedure Congress has authorized 673 permanent district court judgeships to handle the caseload.4Congress.gov. Temporary Judgeships: Frequently Asked Questions
U.S. Courts of Appeals
Thirteen appellate courts sit above the district courts. Twelve are regional circuits, each covering a group of states. The thirteenth, the Court of Appeals for the Federal Circuit, is based in Washington, D.C., and takes specialized cases from anywhere in the country involving patents, international trade, and government contracts.5United States Courts. Appellate Courts and Cases – Journalists Guide
Appellate courts do not retry cases. A three-judge panel reviews the trial record for legal errors — whether the trial judge used the wrong legal standard, excluded evidence improperly, or gave flawed jury instructions. The decision rests on written briefs and oral argument. No new witnesses, no new evidence.
Occasionally a full circuit will rehear a case “en banc,” meaning all active judges on that circuit participate rather than just three. This typically happens when a panel’s decision conflicts with the circuit’s own precedent, conflicts with a Supreme Court ruling, or involves an issue of exceptional importance.6Legal Information Institute. Federal Rules of Appellate Procedure Rule 40 – Panel Rehearing; En Banc Determination En banc review is uncommon but carries significant weight, since it sets binding law for the entire circuit.
The Supreme Court
Nine justices hear cases at the Supreme Court, and their decisions bind every lower federal court and every state court. Most cases arrive through a petition for a writ of certiorari asking the justices to review a lower court’s ruling. Under the Rule of Four, at least four justices must vote to hear a case before the Court takes it.7United States Courts. Supreme Court Procedures Thousands of petitions are filed each term, and only a small fraction are accepted. There is no right to Supreme Court review.
The Court also has original jurisdiction in a narrow set of disputes, including lawsuits between two or more states and cases involving foreign ambassadors.8Constitution Annotated. ArtIII.S2.C2.2 Supreme Court Original Jurisdiction One of its central functions is resolving circuit splits, where two or more appellate courts have read the same federal law differently. Until the Court steps in, the same statute can effectively mean different things depending on where you live.
Specialized Article I Courts
Not every federal court sits inside the three-tier Article III system. Congress has created several courts under Article I that handle specific categories of disputes.
The U.S. Tax Court resolves disputes between taxpayers and the IRS and has nationwide jurisdiction; its judges serve 15-year terms rather than life appointments.9United States Tax Court. United States Tax Court The U.S. Court of Federal Claims hears monetary claims against the federal government, including bid protests on government contracts and vaccine injury compensation cases.10United States Court of Federal Claims. Court of Federal Claims The Court of International Trade decides disputes involving customs duties, tariff classifications, and trade adjustment programs.11Office of the Law Revision Counsel. 28 USC Ch. 95 – Court of International Trade Bankruptcy courts operate as units of the district courts and handle all federal bankruptcy proceedings.
These specialized courts channel technical disputes to judges with concentrated expertise. A Tax Court judge who hears nothing but tax cases develops a depth of knowledge a generalist district judge cannot match handling one tax case a year.
What Cases Federal Courts Can Hear
Federal courts have limited jurisdiction. They can only hear the categories of cases that the Constitution and Congress have authorized; everything else belongs in state court.
Federal Question Jurisdiction
Any civil case arising under the Constitution, federal statutes, or treaties falls within federal question jurisdiction.12Office of the Law Revision Counsel. 28 USC 1331 – Federal Question Civil rights suits, challenges to federal agency regulations, and patent infringement claims all belong here. Criminal prosecutions for federal offenses enter the system the same way, through the federal criminal code.
Diversity Jurisdiction
Federal courts also hear cases between citizens of different states when more than $75,000 is at stake.13Office of the Law Revision Counsel. 28 U.S. Code 1332 – Diversity of Citizenship; Amount in Controversy; Costs The idea is to give out-of-state parties a neutral forum. Both requirements must be met. A $50,000 dispute between residents of different states stays in state court.
Other Categories
Article III extends federal judicial power to admiralty and maritime disputes, cases where the United States is a party, and controversies between states.14Legal Information Institute. U.S. Constitution Article III These categories send disputes involving national interests or multiple sovereigns to a neutral federal tribunal rather than any single state’s courts.
Removal and Standing
A case does not always start in federal court even when federal jurisdiction exists. A plaintiff may file in state court, and the defendant can then remove the case to the federal district court covering that area. The notice of removal generally must be filed within 30 days of being served with the complaint.15Office of the Law Revision Counsel. 28 USC 1446 – Procedure for Removal of Civil Actions In diversity cases, removal is only available if none of the defendants are citizens of the state where the suit was filed.
Even when a case fits a jurisdictional category, the plaintiff still needs standing. Article III’s case-or-controversy requirement means you have to show you suffered an actual or threatened injury, that the injury is traceable to the defendant’s conduct, and that a court ruling in your favor would likely fix the problem.16Legal Information Institute. Standing Requirement: Overview Abstract disagreements with a law or hypothetical future harms are not enough.
The Judges Who Staff the System
Article III judges — district judges, circuit judges, and Supreme Court justices — are nominated by the President and confirmed by the Senate.17United States Courts. Nomination Process Once confirmed, they serve during “good Behaviour,” meaning they can only be removed through impeachment by the House and conviction by a two-thirds vote of the Senate.18United States Senate. About Impeachment Their compensation cannot be reduced while they serve.19Congress.gov. U.S. Constitution – Article III Those protections are what the framers used to insulate judicial decisions from political pressure.
Magistrate and Bankruptcy Judges
Not every federal judge has a lifetime appointment. Magistrate judges serve eight-year terms and handle much of the preliminary work in both civil and criminal cases, including issuing search warrants, running initial hearings, and managing discovery disputes.20Office of the Law Revision Counsel. 28 U.S. Code 631 – Appointment and Tenure Bankruptcy judges serve 14-year terms and manage all proceedings under the federal bankruptcy code.21Office of the Law Revision Counsel. 28 U.S. Code 152 – Appointment of Bankruptcy Judges Both are appointed by the courts themselves, not by the President, and they lack the salary and tenure protections of Article III judges. These fixed-term positions exist because the volume of federal cases far exceeds what life-tenured judges alone can handle.
Senior Status
Article III judges who have served long enough can take senior status rather than fully retiring. The eligibility formula, the Rule of 80, requires a judge’s age plus years of active service to total at least 80, with a minimum age of 65 and at least 10 years of service.22United States Courts. FAQs: Federal Judges Senior judges typically carry a reduced caseload while opening up their seat for a new appointment, often continuing to hear cases for years.
Who Runs the System
The Judicial Conference of the United States is the federal courts’ national policymaking body. It meets twice a year to address administrative and policy issues and to make legislative recommendations to Congress.23United States Courts. About the Judicial Conference of the United States The Chief Justice presides over it, and it works through committees covering everything from budget and security to the rules of practice and procedure. The Administrative Office of the U.S. Courts handles the day-to-day management — personnel, technology, facilities, and the statistics Congress uses when deciding whether to create new judgeships. Neither body tells individual judges how to decide cases, which preserves the independence Article III was built around.