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Trial court of the U. S. federal judiciary
the district courts of the U. S. federal judicial system

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. Each district covers one U. S. state or a portion of a state. There is at least one federal courthouse in each district, and many districts have more than one. District court decisions are appealed to the U. S. court of appeals for the circuit in which they reside, except for certain specialized cases that are appealed to the U. S. Court of Appeals for the Federal Circuit or directly to the U. S. Supreme Court. District courts are courts of law, equity, and admiralty, and can hear both civil and criminal cases. But unlike U. S. state courts, federal district courts are courts of limited jurisdiction, and can only hear cases that involve disputes between residents of different states, questions of federal law, or federal crimes.

Unlike the U. S. Supreme Court, which was expressly established by Article III of the Constitution, the district courts were established by Congress pursuant to authority delegated by Article III through the enacting of a federal statute, the Judiciary Act of 1789. There is no constitutional requirement that district courts exist at all. Edward Carrington advocated this position in a letter to James Madison, and it was also discussed by Alexander Hamilton in Federalist No. 81. When the Act was first passed, there were thirteen districts created among the eleven states which had ratified the Constitution by that point. When North Carolina and Rhode Island voted to ratify, a district was created for each of them, bringing the number of districts to fifteen. The territories (insular areas) of Guam, the Northern Mariana Islands, and the United States Virgin Islands each have one territorial court; these courts are called "district courts" and exercise the same jurisdiction as district courts, but differ from district courts in that territorial courts are Article IV courts, with judges who serve ten year terms rather than the lifetime tenure of judges of Article III courts, such as the district court judges. The Philippines were previously part of the United States but were never part of the U. S. federal court system.

There are 89 districts in the 50 states, with a total of 94 districts including territories. There is at least one judicial district for each state, the District of Columbia, and Puerto Rico. Each state has between one and four districts. For states with multiple districts, they are named geographically. States with two districts all give them either Northern–Southern or Western–Eastern designations. Most states with three districts add a Middle District, with two exceptions: Illinois has a Central District instead of a Middle District, and Oklahoma has Northern, Western, and Eastern Districts. Of the three states with four districts, New York and Texas use all four directional designations, while California has a Central District and no Western District.

There are other federal trial courts that have nationwide jurisdiction over certain types of cases, but the district court also has concurrent jurisdiction over many of those cases, and the district court is the only one with jurisdiction over civilian criminal cases. The United States Court of International Trade addresses cases involving international trade and customs issues. The United States Court of Federal Claims has exclusive jurisdiction over most claims for money damages against the United States, including disputes over federal contracts, unlawful takings of private property by the federal government, and suits for injury on federal property or by a federal employee. The United States Tax Court has jurisdiction over contested pre assessment determinations of taxes.

A judge of a United States district court is officially titled a "United States District Judge". Other federal judges, including circuit judges and Supreme Court justices, can also sit in a district court upon assignment by the chief judge of the circuit or by the Chief Justice of the United States. The number of judges in each district court (and the structure of the judicial system generally) is set by Congress in the United States Code. The president appoints the federal judges for terms of good behavior (subject to the advice and consent of the Senate), so the nominees often share at least some of his or her convictions. In states represented by a senator of the president's party, the senator (or the more senior of them if both senators are of the president's party) has substantial input into the nominating process, and through a tradition known as senatorial courtesy can exercise an unofficial veto over a nominee unacceptable to the senator. Federal magistrate judges are appointed by each district court pursuant to statute. They are appointed for an eight year term and may be reappointed for additional eight year terms. A magistrate judge may be removed "for incompetency, misconduct, neglect of duty, or physical or mental disability". A magistrate judgeship may be a stepping stone to a district judgeship nomination. District judges usually concentrate on managing their court's overall caseload, supervising trials, and writing opinions in response to important motions like the motion for summary judgment. Since the 1960s, routine tasks like resolving discovery disputes can, in the district judge's discretion, be referred to magistrate judges. Magistrate judges can also be requested to prepare reports and recommendations on contested matters for the district judge's consideration or, with the consent of all parties, to assume complete jurisdiction over a case including conducting the trial. With the exception of the territorial courts (Guam, the Northern Mariana Islands, and the Virgin Islands), federal district judges are Article III judges appointed for life, and can be removed involuntarily only when they violate the standard of "good behavior". The sole method of involuntary removal of a judge is through impeachment by the United States House of Representatives followed by a trial in the United States Senate and a conviction by a two thirds vote. Otherwise, a judge, even if convicted of a felony criminal offense by a jury, is entitled to hold office until retirement or death. In the history of the United States, only twelve judges have been impeached by the House, and only seven have been removed following conviction in the Senate. (For a table that includes the twelve impeached judges, see Impeachment in the United States.) A judge who has reached the age of 65 (or has become disabled) may retire or elect to go on senior status and keep working. Such senior judges are not counted in the quota of active judges for the district and do only whatever work they are assigned by the chief judge of the district, but they keep their offices (called "chambers") and staff, and many of them work full time. As of 2010, there were 678 authorized district court judgeships. A federal judge is addressed in writing as "The Honorable John/Jane Doe" or "Hon. John/Jane Doe" and in speech as "Judge" or "Judge Doe" or, when presiding in court, "Your Honor".

Each district court appoints a clerk, who is responsible for overseeing filings made with the court, maintaining the court's records, processing fees, fines, and restitution, and managing the non judicial work of the court, including information technology, budget, procurement, human resources, and financial. Clerks may appoint deputies, clerical assistants, and employees to carry out the work of the court. The clerk of each district court must reside in the district for which the clerk is appointed, except that the clerk of the District of Columbia and the clerk of the Southern District of New York may reside within twenty miles of their respective districts. The Judiciary Act of 1789 authorized the Supreme Court and the judge of each U. S. District Court to appoint a clerk to assist with the administration of federal judicial business in those courts. The clerk for each district court was to also serve as clerk of the corresponding circuit court. The Judiciary Act required each clerk to issue the writs summoning jurors and "to record the decrees, judgments and determinations of the court of which he is clerk." The Judicial Code (28 U. S. C. § 751) provides that the clerk is appointed, and may be removed, by the court. The clerk's duties are prescribed by the statute, by the court's customs and practices, and by policy established by the Judicial Conference of the United States. The clerk is appointed by order of the court en banc to serve the entire court. The role of the clerk and deputies or assistants should not be confused with the judges' law clerks, who assist the judges by conducting research and preparing drafts of opinions. To be eligible to serve as a clerk, a person must have a minimum of 10 years of progressively responsible administrative experience in public service or business that provides a thorough understanding of organizational, procedural, and human aspects of managing an organization, and at least 3 of the 10 years must have been in a position of substantial management responsibility. An attorney may substitute the active practice of law on a year for year basis for the management or administrative experience requirement. Clerks do not have to be licensed attorneys, but some courts specify that a law degree is a preference for employment.

In order to represent a party in a case in a district court, a person must be an attorney at law and generally must be admitted to the bar of that particular court. The United States usually does not have a separate bar examination for federal practice (except with respect to patent practice before the United States Patent and Trademark Office). Admission to the bar of a district court is generally available to any attorney who is admitted to practice law in the state where the district court sits. 56 districts (around 60% of all district courts) require an attorney to be admitted to practice in the state where the district court sits. The other 39 districts (around 40% of all district courts) extend admission to certain lawyers admitted in other states, although conditions vary from court to court. For example, the district courts in New York City (Southern District of New York and Eastern District of New York) extend admission to attorneys admitted to the bar in Connecticut or Vermont and to the district court in that state, but otherwise require attorneys to be admitted to the New York bar. Only 13 districts extend admission to attorneys admitted to any U. S. state bar. The attorney generally submits an application with a fee and takes the oath of admission. Local practice varies as to whether the oath is given in writing or in open court before a judge of the district. A "sponsor" admitted to the court's bar is often required. Several district courts require attorneys seeking admission to their bars to take an additional bar examination on federal law, including the following: the Southern District of Ohio, the Northern District of Florida, and the District of Puerto Rico. Pro hac vice admission is also available in most federal district courts on a case by case basis. Most district courts require pro hac vice attorneys to associate with an attorney admitted to practice before the court. it includes all five counties that make up Greater Los Angeles. By contrast, New York City and the surrounding metropolitan area are divided between the Southern District of New York (which includes Manhattan, The Bronx and Westchester County) and the Eastern District of New York (which includes Brooklyn, Queens, Staten Island, Nassau County and Suffolk County). New York suburbs in Connecticut and New Jersey are covered by the District of Connecticut and District of New Jersey, respectively. The Southern District of New York and the Central District of California are the largest federal districts by number of judges, with 28 judges each. In 2007, the busiest district courts in terms of criminal federal felony filings were the District of New Mexico, Western District of Texas, Southern District of Texas, and the District of Arizona. These four districts all share the border with Mexico. A crackdown on illegal immigration resulted in 75 percent of the criminal cases filed in the 94 district courts in 2007 being filed in these four districts and the other district that borders Mexico, the Southern District of California. The busiest patent litigation court is the United States District Court for the Eastern District of Texas, with the most patent lawsuits filed there nearly every year.

Most extinct district courts have disappeared by being divided into smaller districts. The following courts were subdivided out of existence: Alabama, Arkansas, California, Florida, Georgia, Illinois, Indiana, Iowa, Kentucky, Louisiana, Michigan, Mississippi, Missouri, New York, North Carolina, Ohio, Pennsylvania, Tennessee, Texas, Virginia, Washington, West Virginia, Wisconsin.

On rare occasions, an extinct district court was extinguished by merging it with other district courts. In every case except one, this has restored a district court that had been subdivided:

Between 1794 and 1797, the United States District Court for the District of North Carolina was divided into the United States district courts for the districts of Edenton, New Bern, and Wilmington. Between 1801 and 1802, the United States District Court for the District of New Jersey was divided into the United States district courts for the districts of East Jersey and West Jersey. When California was admitted as a state in 1850, it was initially divided into two districts, the Northern and the Southern. The Southern District of California was abolished on July 27, 1866, and the State made to constitute one district, the statute providing that the Judge of the Northern District exercise the powers of the United States District Court for the District of California, and that all records of the Southern District Court be delivered to the Clerk of the Northern District Court. Twenty years later, on August 5, 1886, Congress re created the Southern District of California. Between 1911 and 1961, the United States District Court for the District of South Carolina was divided into the United States district courts for the Eastern and Western districts of South Carolina. The United States District Court for the Eastern District of Illinois was eliminated and a new United States District Court for the Central District of Illinois was created in its place on October 2, 1978. There are a few additional extinct district courts that fall into neither of the above two patterns. From 1801 to 1802, the District of Columbia and pieces of Maryland and Virginia formed the United States District Court for the District of Potomac, which was the first United States district court to cross state lines. During the same period, the United States District Court for the District of Norfolk was carved out of another piece of Virginia. The United States district courts for the districts of Maryland and Virginia remained during this brief period. From 1801 to 1802, and again from 1802 to 1872, the state of North Carolina was subdivided into the United States district courts for the districts of Albemarle, Cape Fear, and Pamptico. These courts were extinguished when the state was reorganized into the United States district courts for the Eastern and Western districts of North Carolina. United States District Court for the District of Orleans. This court was renamed the United States District Court for the District of Louisiana when the Territory of Orleans became the State of Louisiana. United States District Court for the Canal Zone. This court was abolished, effective March 31, 1982, as part of the process of returning the Canal Zone to Panama. Cases then pending in the Canal Zone court were transferred to the United States District Court for the Eastern District of Louisiana in New Orleans. United States Court for China. This court functioned as a district court between 1906 and 1943. It had jurisdiction over American citizens in China.