The federal court system is made up of three levels. The U.S. District Courts are the lowest level of federal courts. Each state has at least one district court and some states have three or four. In total, there are 94 U.S. District Courts. Usually, cases involving federal laws begin at this level of court.
Decisions made in the district courts may be appealed if one party is dissatisfied with the outcome; these appeals are heard in the U.S. Circuit Court of Appeals. There are 13 U.S. Circuit Court of Appeals in the United States: 11 regional circuit courts, a federal circuit court, and a circuit court in Washington D.C.