Question 21: How many U.S. senators are there?
Official answer
- One hundred (100)
Grandpa explains
Two for each of the 50 states, kiddo: 2 × 50 = 100.
Careful: these are NOT the answer
These are the common mix-ups. The app uses them as traps so you practice.
- Fifty (50)
- Four hundred thirty-five (435)
- Nine (9)
On the 2008 test this is question 18
If you filed your N-400 before October 20, 2025, you take the 2008 version. Which one is mine?
How many U.S. Senators are there?
- one hundred (100)
Video lesson on this topic: Congress
More questions on this topic
- 22How long is a term for a U.S. senator?
- 23Who is one of your state's U.S. senators now?
- 24How many voting members are in the House of Representatives?
- 25How long is a term for a member of the House of Representatives?
- 26Why do U.S. representatives serve shorter terms than U.S. senators?
- 27How many senators does each state have?
Official sources:
- USCIS · 128 Civics Questions and Answers (2025 version), M-1778 (09/25) ↗ · checked October 6, 2026
The plain explanation is ours; the official answers are USCIS's, word for word.