The U.S. House of Representatives has 435 voting members. Add the six non-voting delegates who represent the District of Columbia and the U.S. territories, and the total membership comes to 441.1U.S. Capitol – Visitor Center. The U.S. House of Representatives
Why the Number Is 435
Congress fixed the size of the House at 435 voting seats through the Permanent Apportionment Act of 1929. Before that, Congress passed a new apportionment bill after every census and usually added seats as the population grew. After the 1920 census, lawmakers deadlocked over how to redistribute seats without enlarging the chamber further, and no reapportionment happened for a decade. The 1929 law ended the standoff by locking in the total and making future reapportionments automatic.2Congress.gov. Permanent Apportionment Act of 1929
That cap turns every census into a zero-sum contest. When one state gains a seat because its population grew faster than the national average, another state loses one. The only exception has been temporary: the House briefly held 437 seats after Alaska and Hawaii were admitted in 1959, then dropped back to 435 at the next reapportionment.3NPR. Explainer: Why Does The U.S. House Have 435 Members?
Each of the 435 members serves a two-year term, and every seat is on the ballot in every even-numbered year.1U.S. Capitol – Visitor Center. The U.S. House of Representatives
The Six Non-Voting Members
Beyond the 435 voting representatives, the House seats six members who can speak on the floor and introduce bills but cannot vote on final passage. Five are delegates from the District of Columbia, American Samoa, Guam, the U.S. Virgin Islands, and the Northern Mariana Islands. The sixth is Puerto Rico’s Resident Commissioner, who serves a four-year term rather than the standard two.4Ballotpedia. United States Congressional Non-Voting Members
In committee, these members hold the same powers as voting representatives. They question witnesses, offer amendments, and vote on legislation at the committee stage, where most of the detailed work on bills gets done.5Congress.gov. Parliamentary Rights of the Delegates and Resident Commissioner from Puerto Rico
How the 435 Seats Are Divided Among the States
The Constitution requires a census every ten years, and the results decide how the 435 voting seats are split among the 50 states.6Constitution Annotated. U.S. Constitution – Article I Section 2 Every state is guaranteed at least one seat regardless of population. Seven states currently have only one representative: Alaska, Delaware, North Dakota, South Dakota, Vermont, Wyoming, and (after dropping to one following the 1990 census and regaining a second seat after the 2020 count) Montana.
The distribution runs on a formula called the method of equal proportions. After every state receives its guaranteed first seat, the remaining seats go one at a time to whichever state is most underrepresented relative to its population. The President transmits the results to Congress, and the Clerk of the House then has 15 calendar days to tell each governor how many seats the state will hold.7Office of the Law Revision Counsel. 2 USC 2a – Reapportionment of Representatives
Federal law then requires the state to draw one district per seat, so a state assigned ten seats must create ten districts.8Office of the Law Revision Counsel. 2 USC 2c – Number of Congressional Districts Single-seat states skip redistricting; the whole state is the district.
When Seats Sit Empty
The full 441-member count assumes every seat is filled, and that isn’t always the case. Unlike the Senate, the House has no appointment mechanism. A vacant seat can only be filled by a special election, and the Constitution requires the state’s governor to issue a writ of election calling one.9Congress.gov. House of Representatives Vacancies: How Are They Filled? Until that election happens, the House operates one seat short.