The U.S. House of Representatives has 435 voting members. Those seats are split among the states by population, not equally, and the District of Columbia has no voting House seat.
The short answer: 435 members
The House of Representatives has 435 voting members. That’s the number people usually mean when they ask how big the House is.
This count is about voting House seats. The District of Columbia does not have a voting House seat, which is why the answer is given in terms of voting members specifically.
How those 435 seats are split among the states
The 435 seats are apportioned among the states by population, not divided equally. California gets far more seats than a smaller state like Wyoming because far more people live there.
The basic rule is simple: a state’s share of House seats follows its share of the national population as measured in the census. That means a state can gain a seat, lose a seat, or stay where it is when the count is updated.
What happens after the census
Every 10 years, the Census Bureau counts the population. Congress then uses that census for reapportionment, which means recalculating how many House seats each state should get.
In plain English, the census is the head count, and reapportionment is the step that turns that head count into seat numbers. That is why the map of House representation can change after each decennial census.
How districts are drawn inside each state
After a state knows how many seats it has been assigned, it has to draw districts for those seats. In most states, each district elects one representative, so a state with 10 seats draws 10 districts.
The exact district map is usually drawn by the state government or by a redistricting body the state has created. Those maps are meant to fill the seats the state received through reapportionment.
Why the number is 435 instead of a different total
The House stays at 435 voting members because that is the fixed statutory size of the chamber unless Congress changes it. Reapportionment changes how the seats are divided among states, not the total number of voting seats in the House.
So the total usually does not move, even though the number of seats in each state can change after a census. If Congress changed the law, the total could be different, but under the current setup it remains 435.
A few edge cases readers often miss
The District of Columbia has no voting House seats. It does have a nonvoting delegate, but that is not the same as a voting representative.
Some territories also have delegates or resident commissioners with limited voting rights in the House, but they are not part of the 435 voting seats.