Congress has 535 voting seats: 435 in the House of Representatives and 100 in the Senate. Six non-voting delegates from the District of Columbia and five U.S. territories bring the working total to 541. So when people ask how many congressional seats there are, the answer depends on whether you’re counting only the members who can vote on final passage of legislation.
The House: 435 Voting Seats
The House has been fixed at 435 voting members for over a century. The Permanent Apportionment Act of 1929 (Public Law 71-13) locked in that number and ended the earlier practice of enlarging the chamber every time the population grew or a new state joined.1Congressional Research Service. Size of the U.S. House of Representatives
There was one short-lived exception. When Alaska and Hawaii became states in 1959, Congress temporarily raised the House to 437 so neither new state would push out a sitting representative. After the 1960 census, the total reverted to 435 and has stayed there.1Congressional Research Service. Size of the U.S. House of Representatives
How the 435 Are Divided Among the States
The 435 seats are redistributed among the states after every decennial census using a formula called the method of equal proportions. Each state’s share tracks roughly with its share of the national population, and every state is guaranteed at least one seat regardless of size.2Office of the Law Revision Counsel. 2 US Code 2a – Reapportionment of Representatives
After the 2020 Census, Texas gained two seats. Colorado, Florida, Montana, North Carolina, and Oregon each gained one. California, Illinois, Michigan, New York, Ohio, Pennsylvania, and West Virginia each lost one.3United States Census Bureau. 2020 Census Apportionment Results – Table D1 The overall count didn’t move; only the distribution did.
The Senate: 100 Seats
The Senate has 100 seats because every state gets exactly two senators, no matter its population. That rule comes from Article I, Section 3 of the Constitution and was one of the founding compromises between large and small states. Wyoming carries the same Senate voting power as California, which has roughly 68 times its population.4Constitution Annotated. Article I Section 3 – Senate
The Six Non-Voting Delegates
Beyond the 535 voting members, the House seats six non-voting representatives: one delegate each from the District of Columbia, Guam, the U.S. Virgin Islands, American Samoa, and the Northern Mariana Islands, plus a resident commissioner from Puerto Rico. They can introduce bills, speak on the House floor, and vote in committee, but they cannot vote on final passage of legislation. Puerto Rico’s resident commissioner serves a four-year term; the other five serve two-year terms like regular House members.5Office of the Law Revision Counsel. 48 US Code Chapter 4 Subchapter 5 – Resident Commissioner
When the Totals Can Change
The House total of 435 can only change if Congress passes a new law altering the cap set in 1929. The Senate can only grow if a new state is admitted to the union, which last happened in 1959. Absent either event, the numbers stay where they are; reapportionment shifts seats between states, but never changes the overall count.