The number of representatives is allocated according to the proportion of the state's population. Thus larger states have more representatives than smaller ones. The United States House of Representatives has a fixed number of 435 representatives. The number of representatives per state is reapportioned every 10 years after a population census has been performed for each state.
Each state representative, who holds his position for two years, has to be at least 25 years old with 7 of those years spent as a United States citizen. He should also be resident in the state, if not the district, that he represents during the time of election.Learn more about Branches of Government