How many justices currently serve on the US Supreme Court?

The United States Supreme Court currently consists of nine justices: one chief justice and eight associate justices. This number, while seemingly fixed, is not mandated by the U.S. Constitution. Instead, it is determined by Congress, which has altered the size of the Court several times throughout history.

When the Supreme Court was established by the Judiciary Act of 1789, it originally had six members: a chief justice and five associate justices. The number of justices fluctuated over the years, ranging from as few as five to as many as ten, often in response to the country's expansion and sometimes due to political maneuvering. For instance, early justices were required to "ride circuit," traveling to hear cases in various regions, and as the nation grew, more justices were added to manage the increased workload.

The current composition of nine justices was set by the Judiciary Act of 1869. This number has remained consistent ever since, although there have been attempts to change it, most notably during President Franklin D. Roosevelt's administration in the 1930s. His "court-packing" plan, which sought to add more justices, was ultimately unsuccessful. The stability of nine justices has since become a deeply ingrained tradition, shaping the Court's deliberations and its role as the highest judicial body in the nation.