How many justices are on the Supreme Court?

Explanation

The number of justices is set by Congress; the current count is kept current from the officials file.

Why it matters

The size of the Court has changed through history but has stayed the same for over 150 years.

The 65/20 special consideration

Question 39 is not in the 65/20 set. An applicant who is 65 or older and has been a lawful permanent resident for 20 years or more studies only the 20 marked questions, so this one would not be asked. Everyone else studies all 100.

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Answers that get mixed up with this one

These are the wrong options the practice test puts beside this question. Each one is the correct answer to a different question, which is what makes it tempting.

• announced our independence (from Great Britain)answers Question 8: What did the Declaration of Independence do?
• vote in a federal electionanswers Question 50: Name one right only for United States citizens.
• at age eighteen (18)answers Question 57: When must all men register for the Selective Service?

Kept up to date

This answer changes when officeholders change. HundredCivics updates it from a single verified source, so what you study here matches the current government (verified 2026-07-26).

More System of Government questions

Questions the officer draws from the same part of the test. Studying them together is what keeps their answers apart.

• Question 13: Name one branch or part of the government.Congress · legislative · President · executive · the courts · judicial
• Question 14: What stops one branch of government from becoming too powerful?checks and balances · separation of powers
• Question 15: Who is in charge of the executive branch?the President
• Question 16: Who makes federal laws?Congress · Senate and House (of Representatives) · (U.S. or national) legislature
• Question 17: What are the two parts of the U.S. Congress?the Senate and House (of Representatives)