The Supreme Court can hear two broad types of cases: a small number it takes as a trial court under its original jurisdiction, and a much larger pool of appeals from federal courts of appeals and state courts of last resort. A narrow set of direct appeals and emergency applications rounds out the picture. Out of 7,000 to 8,000 petitions filed each term, the justices typically grant oral argument in only about 80, so the question of what types of cases the Supreme Court can hear is really two questions stacked together: what falls within its power at all, and what the Court chooses to use that power on.
Cases the Court Hears First (Original Jurisdiction)
Original jurisdiction means the Supreme Court acts as the trial court rather than reviewing another court’s decision. Article III of the Constitution grants original jurisdiction in all cases affecting ambassadors, other public ministers, and consuls, and in cases where a state is a party.1Legal Information Institute (LII). Article III, Section 2, Clause 2 – Original Jurisdiction These cases are rare, usually just a handful per term.
Congress refined the picture in 28 U.S.C. ยง 1251.2GovInfo. 28 USC 1251 – Original Jurisdiction Only one category is exclusive to the Supreme Court, meaning no other court may hear it:
- Disputes between two or more states, such as border conflicts and water-rights fights. These are the most common original jurisdiction cases.
- Cases involving foreign diplomats, including ambassadors and consuls as parties.
- Controversies between the United States and a state.
- Lawsuits a state brings against citizens of another state or against foreign nationals.
Everything on that list other than state-versus-state disputes is shared with the lower federal courts, so those cases can also start somewhere else.
Appeals From Federal Courts of Appeals
The vast majority of Supreme Court cases arrive on appeal, and the single biggest source is the federal circuit courts. Any party in a civil or criminal case decided by a U.S. court of appeals may ask the Supreme Court to review the decision by filing a petition for a writ of certiorari.3GovInfo. 28 USC 1254 – Courts of Appeals; Certiorari; Certified Questions A petition can technically be filed before the court of appeals issues its final judgment, though the justices rarely intervene that early.
Federal statute also lets a court of appeals certify a specific legal question directly to the Supreme Court for guidance. The procedure exists on paper but is used very seldom; when it is invoked, the justices can either answer the question or order the whole case sent up for full review.3GovInfo. 28 USC 1254 – Courts of Appeals; Certiorari; Certified Questions
Appeals From State Courts
The Supreme Court can review final judgments from the highest state court available to hear a case, but only when the case raises a federal question. That means the case must involve the validity of a federal treaty or statute, a challenge to a state law as conflicting with the U.S. Constitution or federal law, or a claim of a right or privilege under federal law.4Office of the Law Revision Counsel. 28 USC 1257 – State Courts; Certiorari A dispute that turns entirely on state law is beyond the Court’s reach, no matter how significant.
“Highest state court available” does not always mean the state supreme court. If the state supreme court declines to take the case, the last court that actually ruled counts as the final decision. But if an intermediate state appeals court decided the case and the state supreme court has not weighed in, the losing party generally has to seek review there before turning to Washington.4Office of the Law Revision Counsel. 28 USC 1257 – State Courts; Certiorari
Direct Appeals the Court Must Hear
A narrow category of cases reaches the Supreme Court by direct appeal rather than certiorari, which means the Court is required to hear them. The main example involves three-judge federal district court panels. When a federal statute requires a case to be decided by a three-judge district court, any party may appeal that court’s injunction ruling directly to the Supreme Court, skipping the court of appeals.5Office of the Law Revision Counsel. 28 USC 1253 – Direct Appeals From Decisions of Three-Judge Courts These panels most often appear in redistricting and voting-rights cases. Direct appeals are a tiny part of the docket, but they matter because the Court cannot simply deny them the way it denies a cert petition.
Emergency Applications
Not every request follows the months-long certiorari track. Parties facing urgent circumstances can file an emergency application asking for immediate relief, most often a stay that temporarily blocks a lower court’s order. These applications make up what is sometimes called the “shadow docket” because they are decided without full briefing or oral argument.
An emergency application goes to the individual justice assigned to the federal circuit the case comes from. That justice can act alone or refer the application to the full Court. When the full Court decides, five justices must agree to grant a stay.6Supreme Court of the United States. A Reporter’s Guide to Applications Pending Before The Supreme Court of the United States A party whose application is denied by one justice can renew it with another, though renewed applications are usually referred to the full Court in practice.
To win a stay, the applicant generally has to show four things: a reasonable probability the Court will eventually agree to hear the full case, a fair prospect the lower court got the merits wrong, irreparable harm without the stay, and a balance of harms that favors granting it.6Supreme Court of the United States. A Reporter’s Guide to Applications Pending Before The Supreme Court of the United States These applications can be filed and ruled on at any hour.
How the Court Picks Among Appeals
For the thousands of cert petitions filed each term, the Court has nearly complete discretion. Its own rules say review is “not a matter of right, but of judicial discretion” and will be granted “only for compelling reasons.”7Legal Information Institute (LII). Rule 10 – Considerations Governing Review on Writ of Certiorari
Rule 10 spells out what counts as compelling. The biggest driver is a circuit split: two or more federal courts of appeals reaching conflicting conclusions on the same legal issue. When federal law means one thing in Georgia and something else in California, the Court steps in to impose a uniform answer. The same logic applies when a state’s highest court and a federal appellate court disagree on a federal question.7Legal Information Institute (LII). Rule 10 – Considerations Governing Review on Writ of Certiorari
The justices also look for cases where a lower court has decided an important federal question the Supreme Court hasn’t addressed, or where a lower court has strayed so far from accepted practice that the Supreme Court’s supervisory authority is needed. Thinking the lower court simply got it wrong is usually not enough on its own.7Legal Information Institute (LII). Rule 10 – Considerations Governing Review on Writ of Certiorari
If at least four of the nine justices vote to accept a case, the Court grants certiorari and schedules it for briefing and oral argument.8United States Courts. Supreme Court Procedures That threshold is the “Rule of Four.” A denial leaves the lower court’s decision in place but does not signal agreement with it.
Cases the Supreme Court Will Not Hear
Even within its broad authority, the Court has firm limits on what it can take up. Some come from Article III itself; others from doctrines the Court has built out over two centuries.
No Federal Question
When reviewing a state court decision, the Supreme Court can only intervene if a federal law or constitutional issue is at stake. A dispute that turns entirely on how a state interprets its own statutes or constitution is off limits.9Library of Congress. Article III Section 2, U.S. Constitution
Lack of Standing
A party must have standing, meaning a concrete, personal injury the court’s decision can actually remedy. Abstract grievances, philosophical objections to a law, or injuries shared by the public at large but not by the party specifically will not get through the door. Article III limits judicial power to actual cases and controversies, and the Court enforces that strictly.
Mootness
If the underlying dispute has been resolved before the Court can rule, the case is moot and gets dismissed. A defendant who has already paid the disputed fine leaves nothing to decide. One well-known exception covers cases “capable of repetition, yet evading review”: the challenged action is too short-lived to finish litigating before it expires, and the same party can reasonably expect to face it again.10Legal Information Institute (LII). Exceptions to Mootness: Capable of Repetition, Yet Evading Review Election-law disputes are the classic example.
Political Questions
The Court generally refuses to decide disputes it treats as “political questions” committed by the Constitution to Congress or the President. The doctrine’s edges are fuzzy, but the core idea is that courts have no business second-guessing a decision the Constitution hands to another branch. Impeachment proceedings and some foreign-affairs decisions have historically fallen on the untouchable side of that line.