Final answer:
The size of the House of Representatives is set at 435 members, as part of the United States Congress which also includes the Senate with 100 members.
Step-by-step explanation:
The size of the House of Representatives is set at 435 members. This is determined by the Apportionment Act of 1911, where the number of representatives has been fixed. The United States Congress is divided into two chambers: the Senate, with 100 members, and the House of Representatives, with 435 members. Each state is represented in the House based on its population as determined by the U.S. Census Bureau, conducted every ten years. However, each state has at least one representative, regardless of population size. The Senate, on the other hand, includes two senators from each state, totaling 100 senators.