Congress has 535 voting members: 435 in the House of Representatives and 100 in the Senate. Six additional non-voting delegates and a Resident Commissioner also sit in the House, bringing the total number of people serving in Congress to 541. That is the short answer to how many members are in the House and Senate, and the sections below explain where each number comes from.
435 Voting Members in the House
The House has 435 voting members, each representing a congressional district within their home state. The number has been fixed since the Permanent Apportionment Act of 1929, which locked in the existing seat count and stopped the chamber from expanding after every census.1Congressional Research Service. Size of the U.S. House of Representatives
Under Article I, Section 2 of the Constitution, those 435 seats are redistributed among the states every ten years based on the decennial census. States with growing populations gain seats; states that shrink relative to the national total lose them. Every state gets at least one representative no matter how small its population.1Congressional Research Service. Size of the U.S. House of Representatives
Representatives serve two-year terms, and the entire House stands for election every even-numbered year.2Library of Congress. U.S. Constitution – Article I
Six Non-Voting Delegates
Beyond the 435 voting members, six additional people sit in the House but cannot vote on final passage of legislation. Five are delegates from the District of Columbia, Guam, American Samoa, the Northern Mariana Islands, and the U.S. Virgin Islands. The sixth is Puerto Rico’s Resident Commissioner.3Congressional Research Service. Delegates to the U.S. Congress – History and Current Status
Delegates serve two-year terms. The Resident Commissioner is the exception, serving a four-year term under federal law.4Office of the Law Revision Counsel. 48 USC Chapter 4, Subchapter V – Resident Commissioner All six can introduce bills, sit on committees, vote in committee, and speak on the floor. What they cannot do is vote when the full House votes on final passage.3Congressional Research Service. Delegates to the U.S. Congress – History and Current Status
100 Members in the Senate
The Senate has 100 members, two from each of the 50 states. Article I, Section 3 of the Constitution guarantees this equal representation regardless of a state’s population or size.2Library of Congress. U.S. Constitution – Article I Wyoming’s roughly 580,000 residents get the same two Senate votes as California’s nearly 39 million.
Senators serve six-year terms, staggered so that roughly one-third of the Senate is up for election every two years. The seats are split into three classes, and the two senators from any given state sit in different classes, so a state does not normally have both seats on the ballot at the same time.5Constitution Annotated. Staggered Senate Elections
State legislatures originally chose senators. The 17th Amendment, ratified in 1913, replaced that with direct popular election by voters in each state, while keeping two senators per state.6Library of Congress. U.S. Constitution – Seventeenth Amendment
The Vice President Is Not One of the 100
The Vice President holds the title of President of the Senate but is not counted among its 100 members. The role’s only real legislative power is casting the tie-breaking vote when the Senate splits 50–50.7United States Senate. About the Vice President (President of the Senate)
The Full Count
- House voting members: 435
- Senate members: 100
- Total voting members: 535
- Non-voting delegates and Resident Commissioner: 6
- Grand total serving in Congress: 541
Only the 535 voting members can cast votes on final passage of legislation on the floor of their respective chambers.8Ballotpedia. List of Current Members of the U.S. Congress
Why the Numbers Are Split This Way
The two-chamber structure came out of the Great Compromise at the Constitutional Convention. Larger states wanted representation based on population; smaller states wanted equal footing. The solution gave each side its own chamber. The House reflects population, which is why its 435 seats shift with every census. The Senate treats every state the same, which is why it stays at exactly 100.9Constitution Annotated. ArtI.S1.3.4 Bicameralism Both chambers must pass identical versions of a bill before it can go to the President.