The United States Congress is composed of two houses with a combined total of 535 elected officials serving as representatives. The Senate consists of 100 senators, with two representing each state, while the House of Representatives has 435 seats, with the number of each state's representatives based on population.
Though the years of election are staggered to allow approximately one-third of the House's seats to be rearranged every two years, the total number of seats is bound by legislative fixed ratios. For the Senate, two senators are elected at-large from each state. The House must have a minimum of one representative per state, but the total number of representatives is determined by number of citizens in the state, based on the most recent U.S. census.