Map of the boundaries of the United States district courts within each of the 13 circuits of the United States courts of appeals. All district courts lie within the boundary of a single jurisdiction, usually in a state (heavier lines). Some states have more than one district court (dotted lines denote those jurisdictions)

All district courts lie within the boundary of a single jurisdiction, usually in a state (heavier lines). Some states have more than one district court (dotted lines denote those jurisdictions) The United States district courts are the trial courts of the U.S. federal judiciary. There is one district court for each federal judicial district.

Federal judicial districts have also been established in the District of Columbia and Puerto Rico. Courts in other insular areas are territorial courts under Article I of the Constitution, not United States district courts, although they have similar jurisdiction.

Each district court has one or more meeting places at which it holds hearings and conducts business. Many federal courthouses are named after notable judges, such as the Thurgood Marshall United States Courthouse in New York City or the Hugo L. Black United States Courthouse in Birmingham.