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Why the Supreme Court ended up with nine justices—and how that could change

The U.S. Supreme Court changed size seven times in its first 80 years, from as few as five justices to as many as 10. Now, some argue it’s time to revisit the issue.

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The Supreme Court consisted of nine justices in 1894, but that has not always been the case. The size of the court has fluctuated since the court was founded due to both practical and political reasons.

Nine justices make up the U.S. Supreme Court: one chief justice and eight associate justices. But it hasn’t always been this way. For the first 80 years of its existence, the Supreme Court fluctuated in size from as few as five to as many as 10 before settling at the current number in 1869. Here’s how the court ended up with nine justices—and how that could change.

Constitutional foundations

When the Founding Fathers set out to establish the U.S. Supreme Court at the Constitutional Convention in 1787, they kept the details vague. There are no constitutional requirements for age, experience, or citizenship of Supreme Court justices, nor did the Constitution establish how many justices would make up the court. Instead, it left many of the details up to Congress and the president. (Here's why filling a Supreme Court vacancy in an election year is so complicated.)

Two years later, the first Congress passed the Judiciary Act of 1789—signed into law by George Washington on September 24, 1789—which established a court of six justices responsible for ensuring the constitutionality of laws enacted by the executive and legislative branches.

The law placed the Supreme Court at the top of a three-tier federal court system. At the lowest level, each state would have a federal judge presiding over district courts hearing minor cases related to federal laws as well as maritime cases. Those districts were then organized into three geographical regions with circuit courts that would both serve as trial courts and hear...

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